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Cited by 3,698Neurotransmitter Receptor Influence on BehaviorNeural and Behavioral Psychology StudiesSubstance Abuse Treatment and Outcomes

Neurobiology of addiction: a neurocircuitry analysis

Open access
Koob, George F, Volkow, Nora D·2016·The Lancet Psychiatry
DOI 10.1016/s2215-0366(16)00104-8PMC PMC6135092
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Abstract

Drug addiction represents a dramatic dysregulation of motivational circuits that is caused by a combination of exaggerated incentive salience and habit formation, reward deficits and stress surfeits, and compromised executive function in three stages. The rewarding effects of drugs of abuse, development of incentive salience, and development of drug-seeking habits in the binge/intoxication stage involve changes in dopamine and opioid peptides in the basal ganglia. The increases in negative emotional states and dysphoric and stress-like responses in the withdrawal/negative affect stage involve decreases in the function of the dopamine component of the reward system and recruitment of brain stress neurotransmitters, such as corticotropin-releasing factor and dynorphin, in the neurocircuitry of the extended amygdala. The craving and deficits in executive function in the so-called preoccupation/anticipation stage involve the dysregulation of key afferent projections from the prefrontal cortex and insula, including glutamate, to the basal ganglia and extended amygdala. Molecular genetic studies have identified transduction and transcription factors that act in neurocircuitry associated with the development and maintenance of addiction that might mediate initial vulnerability, maintenance, and relapse associated with addiction.

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Crossref · 10.1016/s2215-0366(16)00104-8

Cites

191 of 191 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

83 of 172 cited sources checked · 34 supported · 2 flagged · accuracy not yet measured

  • Premisecitation

    Key synaptic changes involve glutamate-modulated NMDA and AMPA receptors in glutamatergic projections from the prefrontal cortex and amygdala to the VTA and nucleus accumbens.

    “Key synaptic changes involve glutamate-modulated N-methyl-D-aspartate (NMDA) receptors and α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors in glutamatergic projections from the prefrontal cortex and amygdala to the ventral tegmental area and nucleus accumbens (table 2, circuit 4).”
    Quote in the paperSubstantial claim2 of 3 sources checked
    • cites [32] Kalivas, 2009, The glutamate homeostasis hypothesis of addiction, Nat Rev Neurosci source
    • cites [43] Lüscher, 2011, Drug-evoked synaptic plasticity in addiction: from molecular changes to circuit remodeling, Neuron source

      The Molecular mechanisms sections for the VTA and nucleus accumbens (page numbers unavailable) describe drug-evoked changes involving AMPA and NMDA receptors and identify excitatory inputs from the prefrontal cortex and amygdala. But the VTA section explicitly says it remains unknown which specific inputs undergo drug-evoked plasticity, so the claim is too specific in placing those receptor changes in the named projections. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
    • cites [46] Wolf, 2010, AMPA receptor plasticity in the nucleus accumbens after repeated exposure to cocaine, Neurosci Biobehav Rev source

      Section 1.1 describes glutamate inputs from cortical and limbic regions to the nucleus accumbens and cocaine-related AMPA receptor plasticity there. Section 5.3 also reports NMDA receptor-dependent plasticity in VTA dopamine neurons. The paper does not establish the claimed receptor changes specifically in projections from both the prefrontal cortex and amygdala to both the VTA and nucleus accumbens. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
  • Premisecitation

    The ascending mesocorticostriatal dopamine system has a key role in the rewarding properties of nearly all drugs of abuse.

    “A principal focus of research on the neurobiology of the rewarding effects of abused drugs has been the origins and terminal areas of the ascending mesocorticostriatal dopamine systems that have a key role in the rewarding properties of nearly all drugs of abuse (table 1).”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [34] Wise, 2009, Roles for nigrostriatal—not just mesocorticolimbic—dopamine in reward and addiction, Trends Neurosci source

      The Introduction and Summary and conclusions describe dopamine as important to reward and addiction, and Intravenous cocaine reward gives evidence for its role in cocaine reward. The paper also emphasizes that nigrostriatal dopamine matters, not just mesocorticolimbic dopamine. Our copy does not establish the claim’s scope of “nearly all drugs of abuse.” No page numbers were provided for these passages. (LLM, conf=0.84)

      Experimental — accuracy not yet measured
  • Interpretationcitation

    Conditioned cues in the incentive salience process appear to drive dopamine signalling to maintain drug-taking motivation even when pharmacological effects diminish.

    “Conditioned cues within the incentive salience process appear to drive dopamine signalling to maintain motivation to take the drug, even when its pharmacological effects lessen.”
    Quote in the paperSubstantial claim3 of 3 sources checked
    • cites [57] Schultz, 1997, A neural substrate of prediction and reward, Science source

      In “Information Encoded in Dopaminergic Activity” (p. 2), the paper reports that a reward-predicting cue activates dopamine neurons after learning, while the predicted reward no longer produces a phasic response. It does not establish that this occurs through incentive salience, maintains motivation to take a drug, or persists as a drug’s pharmacological effects lessen; the reported cue experiment used a light predicting a reward in monkeys. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
    • cites [60] Roitman, 2004, Dopamine operates as a subsecond modulator of food seeking, J Neurosci source

      The Discussion (specific page not indexed) reports that learned sucrose-predictive cues evoke dopamine release and links dopamine rises to food-seeking responses. It also compares response initiation for sucrose and cocaine, but does not say that conditioned cues maintain drug-taking motivation as a drug’s pharmacological effects lessen. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
    • cites [61] Volkow, 2014, Stimulant-induced dopamine increases are markedly blunted in active cocaine abusers, Mol Psychiatry source
  • Premisecitation

    Chronic administration of all major drugs with dependence or abuse potential dysregulates the hypothalamic-pituitary-adrenal axis and the CRF brain stress system, with elevated ACTH, corticosterone, and amygdala CRF during acute withdrawal.

    “Both the hypothalamic-pituitary-adrenal axis and brain stress system mediated by CRF are dysregulated by the chronic administration of all major drugs with dependence or abuse potential, with a common response of elevated adrenocorticotropic hormone, corticosterone, and amygdala CRF during acute withdrawal.”
    Quote in the paperSubstantial claim1 of 2 sources checked
    • cites [20] Koob, 2014, Addiction as a stress surfeit disorder, Neuropharmacology source
    • cites [75] Piazza, 1996, Pathophysiological basis of vulnerability to drug abuse: role of an interaction between stress, glucocorticoids, and dopaminergic neurons, Annu Rev Pharmacol Toxicol source
  • Premisecitation

    In humans, intoxicating doses of alcohol and drugs release dopamine and opioid peptides into the ventral striatum.

    “In humans, positron emission tomography studies have shown that intoxicating doses of alcohol and drugs release dopamine and opioid peptides into the ventral striatum,”
    Quote in the paperSubstantial claim1 of 2 sources checked
    • cites [16] Mitchell, 2012, Alcohol consumption induces endogenous opioid release in the human orbitofrontal cortex and nucleus accumbens, Sci Transl Med source
    • cites [35] Volkow, 2007, Profound decreases in dopamine release in striatum in detoxified alcoholics: possible orbitofrontal involvement, J Neurosci source

      The Abstract reports that PET-measured dopamine increased in the ventral striatum after methylphenidate in human subjects, supporting the drug-related dopamine portion. The study used methylphenidate as a challenge in detoxified alcoholics and controls; it does not report that intoxicating alcohol doses release dopamine or that alcohol or drugs release opioid peptides into the ventral striatum. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
  • May combine two claims. 66
  • Classified as probably not a substantial claim. 9
  • The quote only partly states this claim. 1

  • May combine two claims.

    Premisecitation

    D2 receptors inhibit cAMP signalling, are stimulated by phasic and tonic dopamine, and are not deemed necessary for drug reward.

    “By contrast, D2 receptors, which inhibit cAMP signalling, are stimulated by both phasic and tonic dopamine and are not deemed necessary for drug reward.”
    Quote in the paperNot a substantial claim2 of 2 sources checked
    • cites [40] Caine, 2002, Role of dopamine D2-like receptors in cocaine self-administration: studies with D2 receptor mutant mice and novel D2 receptor antagonists, J Neurosci source

      The receptor-binding section describes dopamine agonist–mediated inhibition of cAMP accumulation, and the Discussion concludes that D2 receptors are not necessary for cocaine’s reinforcing effects in the mice studied (page numbers unavailable). The paper does not address stimulation by both phasic and tonic dopamine; it also reports that D2 receptors may be necessary for self-administration of some other drugs, so the broader claim about drug reward is not supported. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
    • cites [64] Bello, 2011, Cocaine supersensitivity and enhanced motivation for reward in mice lacking dopamine D2 autoreceptors, Nat Neurosci source

      The Introduction and Discussion distinguish D2 autoreceptors from D2 receptors generally. They report that mice lacking all D2 receptors have impaired or absent drug-reward responses, contrary to the claim that D2 receptors are not deemed necessary for drug reward; mice lacking only D2 autoreceptors instead show enhanced cocaine reward. The cited passages do not establish the cAMP or tonic-dopamine parts of the sentence. (LLM, conf=0.85)

      Checked by a reasoning model — may be wrong.

      Experimental — accuracy not yet measured

  • May combine two claims.

    Premisecitation

    Blockade of metabotropic glutamate 1 receptors in the nucleus accumbens blocks cue-induced incubation reinstatement and cocaine-primed reinstatement, making these receptors potential therapeutic targets.

    “The blockade of metabotropic glutamate 1 receptors in the nucleus accumbens blocks cue-induced incubation reinstatement and cocaine-primed reinstatement; as a result, these receptors are potential therapeutic targets.145,146”
    Quote in the paperSubstantial claim2 of 2 sources checked
    • cites [145] Schmidt, 2015, Group I metabotropic glutamate receptor-mediated activation of PKC γ in the nucleus accumbens core promotes the reinstatement of cocaine seeking, Addict Biol source

      The Results and Discussion (pages unavailable) report that blocking mGluR1 in the accumbens core attenuated cocaine-primed reinstatement. They do not establish that it blocks cue-induced incubation reinstatement; the cue-related finding discussed concerns mGluR5. The claim also overstates attenuation as complete blockade and omits the core-specific qualification: the Introduction reports no effect of mGluR1 blockade in the accumbens shell. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
    • cites [146] Loweth, 2014, Synaptic depression via mGluR1 positive allosteric modulation suppresses cue-induced cocaine craving, Nat Neurosci source

      The Results section (‘The level of mGluR1 transmission regulates incubation’; page unavailable) says enhancing mGluR1 transmission prevented incubation, while mGluR1 antagonist treatment accelerated a synaptic change associated with it. The Discussion likewise proposes positive allosteric modulators—not blockade—to reduce incubated cue-induced craving. The cited paper does not report a cocaine-primed reinstatement result. (LLM, conf=0.90)

      Checked by a reasoning model — may be wrong.

      Experimental — accuracy not yet measured

  • May combine two claims.

    Premisecitation

    In non-human primates, midbrain dopamine cells initially fire to a novel reward, then stop firing during predictable reward delivery and fire to predictive stimuli.

    “One particularly influential series of studies in non-human primates indicated that midbrain dopamine cells initially fired in response to a novel reward. After repeated exposure, the neurons stopped firing during predictable reward delivery and instead fired when they were exposed to stimuli that were predictive of the reward.”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [57] Schultz, 1997, A neural substrate of prediction and reward, Science source

  • May combine two claims.

    Premisecitation

    Other withdrawal changes include increased μ opioid receptor responsivity during opioid withdrawal and decreased GABAergic and increased NMDA glutamatergic transmission in the nucleus accumbens.

    “Other observed changes include increases in μ opioid receptor responsivity during opioid withdrawal,71,72 and decreases in GABAergic and increases in NMDA glutamatergic transmission in the nucleus accumbens.”
    Quote in the paperNot a substantial claim1 of 3 sources checked
    • cites [71] Stinus, 1990, Nucleus accumbens and amygdala are possible substrates for the aversive stimulus effects of opiate withdrawal, Neuroscience source
    • cites [72] Minkowski, 2012, Differential response to IV carfentanil in chronic cocaine users and healthy controls, Addict Biol source

      The citation is attached to the claim of increased μ-opioid receptor responsivity during opioid withdrawal, not the later GABAergic/NMDA clause. The Discussion (page unavailable) examines cocaine abstinence instead and reports fewer adverse effects from a μ-opioid receptor agonist in cocaine users than in controls. A search for opioid withdrawal and receptor responsivity found no passage addressing the cited claim. (LLM, conf=0.76)

      Experimental — accuracy not yet measured
    • cites [73] Davidson, 1995, Increased NMDA-induced excitability during ethanol withdrawal: a behavioural and histological study, Brain Res source

  • May combine two claims.

    Premisecitation

    Withdrawal involves decreased dopaminergic and serotonergic transmission in the nucleus accumbens, with striatal dopamine responses 50% lower in detoxified abusers and 80% lower in active abusers, and lower self-reported drug reward versus controls.

    “Such changes include decreases in dopaminergic and serotonergic transmission in the nucleus accumbens during drug withdrawal as measured by in-vivo microdialysis in rats69 and brain imaging studies in humans, in which amphetamine-induced or methylphenidate-induced striatal dopamine responses are 50% lower in detoxified abusers and 80% lower in active abusers, and accompanied by lower self-reports”
    Quote in the paperSubstantial claim1 of 3 sources checked
    • cites [25] Martinez, 2007, Amphetamine-induced dopamine release: markedly blunted in cocaine dependence and predictive of the choice to self-administer cocaine, Am J Psychiatry source
    • cites [35] Volkow, 2007, Profound decreases in dopamine release in striatum in detoxified alcoholics: possible orbitofrontal involvement, J Neurosci source

      The Abstract reports methylphenidate-induced dopamine responses 70% lower in ventral striatum and 50% lower in putamen in detoxified alcoholics versus controls. The Behavioral responses to MP section reports lower self-rated drug liking and high in the alcoholic group. The paper does not report an 80% reduction in active abusers; the withdrawal-related dopamine and serotonin finding appears only in the title of a rat study listed in References, not as a finding of this study. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
    • cites [70] Volkow, 1997, Decreased striatal dopaminergic responsiveness in detoxified cocaine-dependent subjects, Nature source

  • May combine two claims.

    Premisecitation

    α5 nicotinic acetylcholine receptors in the habenula appear to modulate aversive responses to large doses of nicotine, and habenular α2 receptors along with α5 are involved in nicotine withdrawal.

    “This hypothesis is also consistent with the finding that α5 nicotinic acetylcholine receptors in the habenula appear to modulate aversive responses to large doses of nicotine48 and, along with habenular α2 receptors, nicotine withdrawal (tables 1, 2, circuit 9).”
    Quote in the paperSubstantial claim1 of 2 sources checked
    • cites [48] Fowler, 2011, Habenular α5 nicotinic receptor subunit signalling controls nicotine intake, Nature source
    • cites [82] Salas, 2009, Nicotinic receptors in the habenulo-interpeduncular system are necessary for nicotine withdrawal in mice, J Neurosci source

  • May combine two claims.

    Premisecitation

    Imaging studies show that cocaine craving cues increase dopamine release in the striatum, amygdala, and prefrontal cortex and opioid peptides in the anterior cingulate and frontal cortex.

    “Imaging studies have also revealed that cues associated with cocaine craving increase dopamine release in the striatum, amygdala, and prefrontal cortex (anterior cingulate and medial orbitofrontal cortex) and opioid peptides in the anterior cingulate and frontal cortex.9,31,106,107”
    Quote in the paperSubstantial claim2 of 4 sources checked
    • cites [9] Koob, 2010, Neurocircuitry of addiction, Neuropsychopharmacology source

      The Ventral Striatum/Dorsal Striatum/Thalamus section (page not provided) reports that drug-associated cues increase dopamine in the dorsal striatum and that the increase correlates with craving. It also links the amygdala and prefrontal cortex to cue-induced craving, but does not report cue-induced dopamine release in those regions. The cited passages do not support increased opioid peptides in the anterior cingulate or frontal cortex. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
    • cites [31] Fotros, 2013, Cocaine cue-induced dopamine release in amygdala and hippocampus: a high-resolution PET [18F]fallypride study in cocaine dependent participants, Neuropsychopharmacology source
    • cites [106] Volkow, 2006, Cocaine cues and dopamine in dorsal striatum: mechanism of craving in cocaine addiction, J Neurosci source
    • cites [107] Milella, 2016, Cocaine cue-induced dopamine release in the human prefrontal cortex, J Psychiatry Neurosci source

      The Results and Discussion report cocaine cue-associated dopamine release in the striatum and prefrontal cortex, strongest in the medial orbitofrontal cortex, with a threshold response in the anterior cingulate. The paper does not report its own amygdala dopamine finding, though its References name a separate study on that region; a search for opioid peptides found no supporting passage. Thus it supports only part of the sentence attributed to it. (LLM, conf=0.88)

      Experimental — accuracy not yet measured

  • May combine two claims.

    Premisecitation

    In patients with obsessive-compulsive disorder, overtraining on a shock avoidance task produced enhanced avoidance habits compared with controls, supporting a habit account of obsessive-compulsive disorder.

    “In a study of patients with obsessive-compulsive disorder, patients showed enhanced avoidance habits compared with controls following overtraining on a shock avoidance task, providing support for a habit account of obsessive-compulsive disorder.”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [83] Gillan, 2014, Enhanced avoidance habits in obsessive-compulsive disorder, Biol Psychiatry source

  • May combine two claims.

    Interpretationcitation

    Decreases in nucleus accumbens dopamine release can be driven by increased dynorphin-κ opioid receptor activity in the ventral striatum and possibly increased CRF in the VTA, contributing to negative emotional states in withdrawal and protracted abstinence.

    “Decreases in the release of dopamine in the nucleus accumbens can also be driven by increases in the activity of the dynorphin-κ opioid receptor system in the ventral striatum and possibly increases in the activity of CRF in the ventral tegmental area, which contributes to the negative emotional state associated with withdrawal and protracted abstinence.”
    Quote in the paperSubstantial claim1 of 2 sources checked
    • cites [20] Koob, 2014, Addiction as a stress surfeit disorder, Neuropharmacology source

      Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

      Experimental — accuracy not yet measured
    • cites [21] Carlezon, 2000, Herpes simplex virus-mediated gene transfer as a tool for neuropsychiatric research, Crit Rev Neurobiol source

  • May combine two claims.

    Premisecitation

    In rats, the prefrontal cortex sends glutamatergic projections directly to mesocortical dopamine neurons in the ventral tegmental area, exerting excitatory control over dopamine cell firing and dopamine release in the prefrontal cortex.

    “In rats, the prefrontal cortex (mainly prelimbic cortex, and some infralimbic cortex) sends glutamatergic projections directly to mesocortical dopamine neurons in the ventral tegmental area, thus exerting excitatory control over dopamine cell firing and dopamine release in the prefrontal cortex90”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [90] Geisler, 2008, Functional implications of glutamatergic projections to the ventral tegmental area, Rev Neurosci source

      Section 2.3 describes a predominantly glutamatergic projection from the prefrontal cortex to the VTA, concentrated in prelimbic cortex with a lesser contribution from infralimbic cortex, and says its axons synapse onto mesocortical dopamine neurons. The Introduction reports that activation of an excitatory prefrontal-to-VTA pathway induces dopamine-neuron burst firing. But the functional-anatomy discussion also emphasizes indirect pathways and inhibition of many dopamine neurons; our copy does not establish the claimed excitatory control of dopamine release specifically in the prefrontal cortex. (LLM, conf=0.88)

      Experimental — accuracy not yet measured

  • May combine two claims.

    Premisecitation

    Volkow and Goldstein described a syndrome characterized by excessive salience to drug-paired cues, decreased responsiveness to non-drug rewards, and decreased ability to inhibit maladaptive behaviour.

    “Indeed, Volkow and colleagues36 and Goldstein and Volkow14 have described a syndrome that is characterised by excessive salience to drug-paired cues, decreases in the responsiveness to non-drug rewards, and decreases in the ability to inhibit maladaptive behaviour.”
    Quote in the paperNot a substantial claim1 of 2 sources checked
    • cites [36] Volkow, 2003, The addicted human brain: insights from imaging studies, J Clin Invest source
    • cites [14] Goldstein, 2011, Dysfunction of the prefrontal cortex in addiction: neuroimaging findings and clinical implications, Nat Rev Neurosci source

  • May combine two claims.

    Premisecitation

    Alcohol use during adolescence might lead to epigenetic modifications that alter amygdalar gene expression and dendritic density, increasing susceptibility to anxiety-like behaviours and alcohol ingestion in adulthood.

    “alcohol use during adolescence might lead to epigenetic modifications that alter amygdalar gene expression and dendritic density, increasing susceptibility to anxiety-like behaviours and alcohol ingestion in adulthood.140”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites [140] Pandey, 2015, Potential role of adolescent alcohol exposure-induced amygdaloid histone modifications in anxiety and alcohol intake during adulthood, Neurobiol Dis source

  • May combine two claims.

    Premisecitation

    Blockade of mTORC1 systemically blocked reconsolidation of cocaine memories, and blockade in the amygdala blocked reconsolidation of alcohol memories, suggesting a potential molecular target for relapse treatment.

    “Even more compelling, blockade of the mTORC1 pathway systemically blocked the reconsolidation of cocaine memories,150 and blockade of mTORC1 in the amygdala blocked the reconsolidation of alcohol memories;151 these results suggest a potential molecular target for the treatment of relapse.”
    Quote in the paperSubstantial claim2 of 2 sources checked
    • cites [150] Shi, 2014, Reactivation of cocaine reward memory engages the Akt/GSK3/mTOR signaling pathway and can be disrupted by GSK3 inhibition, Psychopharmacology (Berl) source

      The Methods and Results report that systemic injection of the GSK3 inhibitor SB216763 after memory reactivation disrupted reconsolidation of cocaine reward memory. They do not report systemic blockade of mTORC1; the Discussion describes reduced mTORC1 phosphorylation after memory reactivation, not an mTORC1-blockade experiment. The alcohol-memory finding has a separate citation in the citing sentence and is not attributed to this paper. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
    • cites [151] Barak, 2013, Disruption of alcohol-related memories by mTORC1 inhibition prevents relapse, Nat Neurosci source

  • May combine two claims.

    Premisecitation

    Imaging studies report differential activation of the insula during craving, possibly reflecting interoceptive cues and hypothesised to involve CRF activation.

    “Consistent with this hypothesis, imaging studies have reported differential activation of the insula during craving, possibly reflecting interoceptive cues and hypothesised to involve CRF activation (table 2, circuit 18).54,117,118”
    Quote in the paperNot a substantial claim2 of 3 sources checked
    • cites [54] Naqvi, 2009, The hidden island of addiction: the insula, Trends Neurosci source

      The Evidence for the role of the insula in addiction section reports imaging activation of the insula during drug urges, and the Proposed role section links those urges to interoceptive representations. The Anatomy and function section notes CRF receptors in the insula and a possible role in stress-related motivation to take drugs, but it does not link the reported imaging activation during craving to CRF activation. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
    • cites [117] Sánchez, 1999, Autoradiographic and in situ hybridization localization of corticotropin-releasing factor 1 and 2 receptors in nonhuman primate brain, J Comp Neurol source
    • cites [118] Goudriaan, 2010, Brain activation patterns associated with cue reactivity and craving in abstinent problem gamblers, heavy smokers and healthy controls: an fMRI study, Addict Biol source

      The Results (fMRI cue reactivity; page unavailable) report a positive association between gambling craving and left anterior insula activation, supporting the insula–craving portion of the claim. The passages do not link that activation to interoceptive cues or hypothesise CRF activation. (LLM, conf=0.86)

      Experimental — accuracy not yet measured

  • May combine two claims.

    Premisecitation

    During incubation of craving in animal models, AMPA-type glutamate receptors are recruited: the infralimbic medial prefrontal cortex-to-nucleus accumbens shell circuit recruits calcium-permeable AMPA receptors, and the prelimbic medial prefrontal cortex-to-nucleus accumbens core circuit recruits non-calcium-permeable AMPA receptors.

    “Specifically, the infralimbic medial prefrontal cortex-to-nucleus accumbens shell circuit recruits calcium-permeable AMPA receptors,144 and the prelimbic medial prefrontal cortex-to-nucleus accumbens core circuit recruits non-calcium-permeable AMPA receptors.”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [144] Conrad, 2008, Formation of accumbens GluR2-lacking AMPA receptors mediates incubation of cocaine craving, Nature source

      Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

      Experimental — accuracy not yet measured

  • May combine two claims.

    Interpretationcitation

    The Go system could drive craving and engage habits via the basal ganglia.

    “The Go system could drive craving and engage habits via the basal ganglia.105,127”
    Quote in the paperSubstantial claim2 of 2 sources checked
    • cites [105] Jasinska, 2014, Factors modulating neural reactivity to drug cues in addiction: a survey of human neuroimaging studies, Neurosci Biobehav Rev source
    • cites [127] Niendam, 2012, Meta-analytic evidence for a superordinate cognitive control network subserving diverse executive functions, Cogn Affect Behav Neurosci source

      The Discussion (page unavailable) reports caudate and putamen activation in executive-function tasks, but does not connect those regions to a Go system, craving, or habits. Searches for those terms and for basal-ganglia, striatal, reward, and motivational mechanisms found no passage addressing the claim. (LLM, conf=0.76)

      Experimental — accuracy not yet measured

  • May combine two claims.

    Premisecitation

    Methamphetamine-dependent individuals with striatal D2 receptor availability in the normal range had better treatment outcomes, potentially reflecting greater ability to acquire new reward-related behaviours and pursue healthy goals.

    “Methamphetamine-dependent individuals with striatal D2 receptor availability within the normal range had better treatment outcomes, potentially reflecting a greater ability to acquire new reward-related behaviours and the pursuit of healthy goals.126”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites [126] Wang, 2012, Decreased dopamine activity predicts relapse in methamphetamine abusers, Mol Psychiatry source

  • May combine two claims.

    Interpretationcitation

    The Stop system could control assessment of the incentive value of choices and suppression of affective responses to negative emotional signals.

    “The Stop system could control assessment of the incentive value of choices and suppression of affective responses to negative emotional signals.130–132”
    Quote in the paperSubstantial claim1 of 3 sources checked
    • cites [130] Damasio, 1996, The somatic marker hypothesis and the possible functions of the prefrontal cortex, Philos Trans R Soc Lond B Biol Sci source
    • cites [131] Bechara, 1999, Different contributions of the human amygdala and ventromedial prefrontal cortex to decision-making, J Neurosci source
    • cites [132] Johnstone, 2007, Failure to regulate: counterproductive recruitment of top-down prefrontal-subcortical circuitry in major depression, J Neurosci source

      The Introduction and Materials and Methods (page unavailable) describe top-down regulation and attempts to suppress emotional responses to negative pictures. The paper does not address a “Stop system” assessing the incentive value of choices, so that part of the claim is unsupported. (LLM, conf=0.85)

      Experimental — accuracy not yet measured

  • May combine two claims.

    Premisecitation

    Tobacco smokers with insula damage, but not control smokers with extra non-insular lesions, were able to stop smoking easily without cravings or relapse.

    “Tobacco smokers with damage to the insula (but not control smokers with extra non-insular lesions) were able to stop smoking easily and without experiencing cravings or relapse.114”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [114] Naqvi, 2007, Damage to the insula disrupts addiction to cigarette smoking, Science source

      The paper’s results (section labelled Abstract; page unavailable) report that 12 of 13 smokers who quit after insula damage met criteria including easy quitting, no relapse, and no subsequent urges, compared with 4 of 19 quitters with non-insular lesions. The contrast is supported, but “not control smokers” is too absolute: four controls also met those criteria, and not every smoker with insula damage quit. (LLM, conf=0.90)

      Experimental — accuracy not yet measured

  • May combine two claims.

    Premisecitation

    Low striatal D2 receptor levels are associated with decreased baseline glucose metabolism in the prefrontal cortex, impulsivity in methamphetamine abusers, and compulsive cocaine administration in rodents.

    “These low levels of striatal D2 receptors have been associated with decreases in baseline glucose metabolism (ie, a marker of brain function) in the prefrontal cortex (including dorsolateral prefrontal cortex, anterior cingulate gyrus, and medial orbitofrontal cortex),35,123,124 impulsivity in methamphetamine abusers,125 and compulsive cocaine administration in rodents.15”
    Quote in the paperSubstantial claim2 of 5 sources checked
    • cites [35] Volkow, 2007, Profound decreases in dopamine release in striatum in detoxified alcoholics: possible orbitofrontal involvement, J Neurosci source

      The Results section reports that baseline striatal D2/D3 receptor availability correlated with glucose metabolism in the cingulate gyrus and dorsolateral prefrontal cortex in detoxified alcoholics, but not controls. It does not report a baseline-receptor correlation with medial orbitofrontal metabolism; its orbitofrontal finding concerns methylphenidate-induced dopamine changes. The later impulsivity and rodent clauses have separate citations and are not attributed to this source. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
    • cites [123] Volkow, 1993, Decreased dopamine D2 receptor availability is associated with reduced frontal metabolism in cocaine abusers, Synapse source
    • cites [124] Volkow, 2001, Low level of brain dopamine D2 receptors in methamphetamine abusers: association with metabolism in the orbitofrontal cortex, Am J Psychiatry source
    • cites [125] Lee, 2009, Striatal dopamine d2/d3 receptor availability is reduced in methamphetamine dependence and is linked to impulsivity, J Neurosci source
    • cites [15] Everitt, 2008, Review. Neural mechanisms underlying the vulnerability to develop compulsive drug-seeking habits and addiction, Philos Trans R Soc Lond B Biol Sci source

  • May combine two claims.

    Premisecitation

    In animal models, dopamine D1 receptor knockout rats will not self-administer cocaine and μ opioid receptor knockout mice will not show rewarding effects of opioids.

    “Notably, in animal models, dopamine D1 receptor knockout rats will not self-administer cocaine37 and μ opioid receptor knockout mice will not show the rewarding effects of opioids.153”
    Quote in the paperSubstantial claim1 of 2 sources checked
    • cites [37] Caine, 2007, Lack of self-administration of cocaine in dopamine D1 receptor knock-out mice, J Neurosci source

      The Abstract and Discussion report that dopamine D1 receptor knock-out mice did not reliably self-administer cocaine. The citing sentence says rats, but this study tested mice. The separate claim about μ opioid receptor knock-out mice is attached to a different citation and is not assessed here. (LLM, conf=0.90)

      Experimental — accuracy not yet measured
    • cites [153] Matthes, 1996, Loss of morphine-induced analgesia, reward effect and withdrawal symptoms in mice lacking the μ-opioid-receptor gene, Nature source

  • May combine two claims.

    Premisecitation

    mTORC1 plays a major role in molecular mechanisms of learning and memory and is involved in epilepsy, Parkinson's disease, Alzheimer's disease, and addiction.

    “As such, mTORC1 plays a major role in the molecular mechanisms associated with learning and memory147 and is involved in several brain disorders, including epilepsy, Parkinson’s disease, Alzheimer’s disease, and addiction.148,149”
    Quote in the paperSubstantial claim2 of 3 sources checked
    • cites [147] Costa-Mattioli, 2009, Translational control of long-lasting synaptic plasticity and memory, Neuron source
    • cites [148] Costa-Mattioli, 2013, mTOR complexes in neurodevelopmental and neuropsychiatric disorders, Nat Neurosci source
    • cites [149] Neasta, 2014, mTOR complex 1: a key player in neuroadaptations induced by drugs of abuse, J Neurochem source

  • May combine two claims.

    Premisecitation

    PET studies show substantial reductions of D2 receptor availability in the striatum in individuals with addiction that persist for months after protracted detoxification, also observed in rodents and non-human primates with repeated drug exposure.

    “Positron emission tomography studies have uncovered substantial reductions of D2 receptor availability in the striatum in individuals with addiction that persist for months after protracted detoxification, which have also been observed in preclinical studies in rodents and non-human primates with repeated drug exposure.122”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [122] Volkow, 2009, Imaging dopamine's role in drug abuse and addiction, Neuropharmacology source

      Split into 2 atoms — 1 confirmed, 0 partially supported, 0 disputed, 0 misattributed, 1 unverifiable. Expand the claim to see per-atom verdicts.

      Experimental — accuracy not yet measured

  • May combine two claims.

    Interpretationcitation

    The field has excellent and validated animal models and well developed clinical models that, combined with neurocircuitry analysis, will provide a unique approach to medication development emphasizing excessive incentive salience, loss of brain reward function, gain of stress function driving negative reinforcement, and dysregulation of executive function, key components driving compulsive drug寻求.

    “Our contention is that the field of the neurobiology of addiction has excellent and validated animal models and well developed clinical models that, combined with the neurocircuitry analysis herein, will provide a unique approach to medication development that emphasises excessive incentive salience, the loss of brain reward function, and the gain of stress function that drive negative reinfor”
    Quote in the paperSubstantial claim1 of 2 sources checked
    • cites [13] Koob, 2016, Existing and future drugs for the treatment of the dark side of addiction, Annu Rev Pharmacol Toxicol source
    • cites [185] Koob, 2009, Development of pharmacotherapies for drug addiction: a Rosetta stone approach, Nat Rev Drug Discov source

      Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

      Experimental — accuracy not yet measured

  • May combine two claims.

    Premisecitation

    Drug exposure during adolescence is associated with more chronic and intensive use and greater risk of substance use disorder than initiation at older ages.

    “Drug exposure during adolescence is associated with more chronic and intensive use and greater risk of a substance use disorder than is initiation at older ages.167,169–172”
    Quote in the paperSubstantial claim1 of 5 sources checked
    • cites [167] Spear, 2013, Adolescent neurodevelopment, J Adolesc Health source

      In “Broad implications of recent research for adolescent policy and programs” (page unavailable), the paper says adolescent responses to rewards may encourage continued and escalating drug use and lead to problematic involvement. It does not establish that people first exposed during adolescence have more chronic or intensive use, or a greater risk of substance use disorder, than people who initiate at older ages. (LLM, conf=0.82)

      Experimental — accuracy not yet measured
    • cites [169] Grant, 2001, Age at onset of alcohol use and DSM-IV alcohol abuse and dependence: a 12-year follow-up study, J Subst Abuse source
    • cites [170] Volkow, 2006, Altered pathways: drug abuse and age of onset, Addict Professional

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites [171] Hingson, 2006, Age of alcohol-dependence onset: associations with severity of dependence and seeking treatment, Pediatrics source
    • cites [172] King, 2007, A prospective study of the effects of age of initiation of alcohol and drug use on young adult substance dependence, J Stud Alcohol Drugs source

  • Probably not a substantial claim: may not pass S2 (checkable).

    Interpretationcitation

    Advances in diagnosis reflecting endophenotype or research domain criterion approach will synergistically combine with advances in neurobiology to promote novel pharmacotherapeutic, brain stimulation, and behavioural treatments.

    “Advances in diagnosis that reflect such an endophenotype or research domain criterion approach will synergistically combine with advances in neurobiology to promote novel pharmacotherapeutic, brain stimulation (ie, transcranial magnetic stimulation and direct electrical stimulation), and behavioural treatments.186”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites [186] Kwako, 2015, Addictions neuroclinical assessment: a neuroscience-based framework for addictive disorders, Biol Psychiatry source

      The Introduction’s “Changes in Nosology” section says that a mechanistically informed approach to diagnosis may identify improved treatments and better match patients to them; it discusses both medications and behavioural treatments. It does not support the more definite prediction that diagnostic and neurobiological advances will synergistically produce novel treatments, and the passages found do not address brain stimulation. Page numbers are unavailable in our copy. (LLM, conf=0.84)

      Experimental — accuracy not yet measured

  • May combine two claims.

    Premisecitation

    A genetic knock-in mouse recapitulating human FAAH mutation C385A presented reduced FAAH expression associated with the variant allele that selectively enhanced fronto-amygdala connectivity and fear extinction learning and decreased anxiety-like behaviours, suggesting a possible molecular genetic target.

    “From the perspective of the preoccupation/anticipation stage, a genetic knock-in mouse that bio logically recapitulates a common human mutation in the gene for fatty acid amide hydrolase (C385A [Pro129Thr], rs324420) presented a reduction of fatty acid amide hydrolase expression associated with the variant allele that selectively enhanced fronto-amygdala connectivity and fear extinction learning”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [165] Dincheva, 2015, FAAH genetic variation enhances fronto-amygdala function in mouse and human, Nat Commun source

  • May combine two claims.

    Premisecitation

    Experimentation and addiction most often start in adolescence, a period of important brain developmental changes.

    “Experimentation, as well as the process of addiction, most often starts in adolescence,166 a period during which the brain undergoes important developmental changes.167”
    Quote in the paperSubstantial claim1 of 2 sources checked
    • cites [166] Wagner, 2002, From first drug use to drug dependence; developmental periods of risk for dependence upon marijuana, cocaine, and alcohol, Neuropsychopharmacology source
    • cites [167] Spear, 2013, Adolescent neurodevelopment, J Adolesc Health source

  • May combine two claims.

    Premisecitation

    Normal adolescent-specific behaviours such as risk-taking, novelty-seeking, and high sensitivity to peer pressure increase propensity to experiment with legal and illegal drugs, possibly reflecting incomplete development of brain regions involved in executive control and motivation.

    “Normal adolescent-specific behaviours (eg, risk-taking, novelty-seeking, and high sensitivity to peer pressure) increase the propensity to experiment with legal and illegal drugs,167 which might reflect the incomplete development of brain regions (eg, myelination of frontal lobe regions) that are involved in the processes of executive control and motivation.168”
    Quote in the paperSubstantial claim1 of 2 sources checked
    • cites [167] Spear, 2013, Adolescent neurodevelopment, J Adolesc Health source

      Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

      Experimental — accuracy not yet measured
    • cites [168] Giedd, 1999, Brain development during childhood and adolescence: a longitudinal MRI study, Nat Neurosci source

  • May combine two claims.

    Premisecitation

    Mechanisms responsible for stress-induced increases in vulnerability to drug use and relapse are not well understood, but evidence suggests CRF is involved through effects in the amygdala and hypothalamic-pituitary-adrenal axis.

    “The mechanisms that are responsible for stress-induced increases in vulnerability to drug use and relapse in those who are addicted are not yet well understood, but evidence suggests that the stress-responsive neuropeptide CRF is involved through its effects in the amygdala and hypothalamic-pituitary-adrenal axis.20”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites [20] Koob, 2014, Addiction as a stress surfeit disorder, Neuropharmacology source

  • May combine two claims.

    Premisecitation

    GWAS implicated α4 and α5 nicotinic receptor subunits in vulnerability to nicotine dependence and a SNP regulating trafficking and gating of AMPA-selective glutamate receptors (CNIH3) in opioid dependence.

    “For example, genome-wide association studies have implicated two acetylcholine receptors, the α4 nicotinic receptor subunit157 and α5 nicotinic receptor subunit,158 in the vulnerability to nicotine dependence and a single-nucleotide polymorphism associated with regulating the trafficking and gating properties of AMPA-selective glutamate receptors (CNIH3) in opioid dependence.159”
    Quote in the paperNot a substantial claim3 of 3 sources checked
    • cites [157] Hancock, 2015, Genome-wide meta-analysis reveals common splice site acceptor variant in CHRNA4 associated with nicotine dependence, Transl Psychiatr source
    • cites [158] Olfson, 2016, Rare, low frequency and common coding variants in CHRNA5 and their contribution to nicotine dependence in European and African Americans, Mol Psychiatry source
    • cites [159] Nelson, 2016, Evidence of CNIH3 involvement in opioid dependence, Mol Psychiatry source

      The Results (Confirmation of association findings) report genome-wide significant associations between CNIH3 SNPs and opioid dependence, while the Discussion describes CNIH3 as an AMPA-receptor auxiliary protein that affects receptor deactivation and desensitization. The paper does not establish that an associated SNP itself regulates AMPA-receptor trafficking or gating. Citation 159 is attached to the opioid-dependence clause, not the separate nicotine-dependence claims. (LLM, conf=0.83)

      Experimental — accuracy not yet measured

  • May combine two claims.

    Premisecitation

    D3 receptors are high-affinity dopamine receptors that co-localise with D1 receptors in the nucleus accumbens and are associated with drug-seeking behaviour.

    “D3 receptors, which are high-affinity dopamine receptors and co-localise in the nucleus accumbens with D1 receptors, are also associated with drug-seeking behaviour.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [65] Vorel, 2002, Dopamine D3 receptor antagonism inhibits cocaine-seeking and cocaine-enhanced brain reward in rats, J Neurosci source

  • May combine two claims.

    Premisecitation

    Impulsivity and compulsivity can coexist and often do so across different stages of the addiction cycle.

    “However, impulsivity and compulsivity can coexist, and frequently do so in the different stages of the addiction cycle.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [8] Berlin, 2014, Compulsivity, impulsivity, and the DSM-5 process, CNS Spectr source

  • May combine two claims.

    Premisenone given

    No animal model fully reproduces human addiction, but animal models permit investigation of specific signs or symptoms of the condition.

    “Although no animal model of addiction fully emulates the human condition, they permit investigations of specific signs or symptoms that are associated with the psychopathological condition.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    Differential regional changes in nicotinic receptor function in the nucleus accumbens and ventral tegmental area occur in nicotine, alcohol, and other addictions, implicating α4β2 nicotinic receptor subtypes.

    “Differential regional changes in nicotinic receptor function in the nucleus accumbens and ventral tegmental area in nicotine, alcohol, and other addictions have also been reported, implicating α4β2 nicotinic receptor subtypes.”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [19] Dani, 1996, Molecular and cellular aspects of nicotine abuse, Neuron source
    • cites [44] Tolu, 2013, Co-activation of VTA DA and GABA neurons mediates nicotine reinforcement, Mol Psychiatry source

  • May combine two claims.

    Interpretationcitation

    Addiction can be conceptualised as a recurring three-stage cycle-binge/intoxication, withdrawal/negative affect, and preoccupation/anticipation-that worsens over time and involves neuroplastic changes in reward, stress, and executive function systems.

    “Addiction can be conceptualised as a three-stage, recurring cycle—binge/intoxication, withdrawal/negative affect, and preoccupation/anticipation (craving)—that worsens over time and involves neuroplastic changes in the brain reward, stress, and executive function systems.”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites [4] Koob, 1997, Drug abuse: hedonic homeostatic dysregulation, Science source
    • cites [5] Goldstein, 2002, Drug addiction and its underlying neurobiological basis: neuroimaging evidence for the involvement of the frontal cortex, Am J Psychiatry source
    • cites [6] Baumeister, 1994

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Interpretationnone given

    Addiction involves a severe disruption of motivational circuits caused by exaggerated incentive salience and habit formation, reward deficits and stress surfeits, and impaired executive function across three stages.

    “Drug addiction represents a dramatic dysregulation of motivational circuits that is caused by a combination of exaggerated incentive salience and habit formation, reward deficits and stress surfeits, and compromised executive function in three stages.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Interpretationcitation

    Ventral striatum activation recruits striatal-globus pallidal-thalamocortical loops that engage the dorsal striatum, producing habit formation and possibly compulsive drug responding.

    “Activation of the ventral striatum leads to the recruitment of striatal-globus pallidalthalamocortical loops that engage the dorsal striatum, resulting in habit formation45 and triggering what is hypothesised to underlie compulsive responding for drugs (table 2, circuits 3 and 4).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [45] Belin, 2009, Parallel and interactive learning processes within the basal ganglia: relevance for the understanding of addiction, Behav Brain Res source
    • cites [59] Belin, 2008, Cocaine seeking habits depend upon dopamine-dependent serial connectivity linking the ventral with the dorsal striatum, Neuron source

  • May combine two claims.

    Interpretationreasoning

    Lower-affinity D1 receptors, which stimulate cAMP signalling, are involved in acute drug reward and conditioning because both induce dopamine spikes.

    “This mechanism implicates lower-affi nity D1 receptors, which stimulate cyclic adenosine monophosphate (cAMP) signalling, as being involved in both acute drug reward and conditioning, because both induce spikes in dopamine release.”
    Quote in the paperSubstantial claim

  • May combine two claims. The quote only partly states this claim.

    Premisereasoning

    Drug reward circuitry includes many neural inputs and outputs interacting with the basal forebrain, involving dopamine, opioid peptides, GABA, glutamate, serotonin, acetylcholine, and endocannabinoids at the VTA or nucleus accumbens.

    “The specific circuitry that is associated with drug reward has been broadened to include many neural inputs and outputs that interact with the basal forebrain.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    A new reward and later its associated cues trigger phasic dopamine cell firing and D1 receptor activation, which is necessary for conditioning.

    “A new reward—and subsequently the cues associated with the reward—triggered phasic dopamine cell firing and activation of dopamine D1 receptors, which are necessary for conditioning to occur (table 2, circuits 1–4).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [58] Ungless, 2001, Single cocaine exposure in vivo induces long-term potentiation in dopamine neurons, Nature source

  • Probably not a substantial claim: may not pass S4 (based). May combine two claims.

    Interpretationnone given

    Balanced circuits produce proper inhibitory control, decision making, and normal reward, motivation, stress, and memory function.

    “Balanced circuits result in proper inhibitory control and decision making and normal functioning of reward, motivation, stress, and memory circuits.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Interpretationreasoning

    Conditioned reinforcement and incentive salience are constructs underlying cue-induced drug seeking, self-administration, and possibly the transition to habit-like compulsive drug seeking.

    “Both conditioned reinforcement and incentive salience provide constructs for what underlies cue-induced drug seeking, self-administration behaviours, and, conceivably, the transition to habit-like compulsive drug seeking.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Interpretationreasoning

    Conditioned cues recruiting these circuits augment progression through the addiction cycle and help explain craving and compulsive use during exposure to drug cues or stressful environments linked to negative emotional states.

    “The ability of conditioned cues to recruit these circuits augments progression through the addiction cycle and helps explain intense desire for the drug (ie, craving) and compulsive use when individuals with addiction are exposed to drug cues or stressful environments that are linked with negative emotional states.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Interpretationreasoning

    Individuals shift from impulsivity to compulsivity, and drug-taking motivation shifts from positive to negative reinforcement.

    “In this context, individuals move from impulsivity to compulsivity, and the drive for drug-taking behaviour is paralleled by shifts from positive to negative reinforcement (figure 1).”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Interpretationreasoning

    This process endows previously neutral stimuli with incentive salience and strengthens learned associations, creating strong motivation to seek reward.

    “This process allows previously neutral stimuli to become endowed with incentive salience and strengthens the learned association with repeated exposure to the cues, which creates strong motivation to seek a reward.”
    Quote in the paperSubstantial claim

  • Classified as probably not a substantial claim.

    Premisecitation

    The anti-reward concept proposes that opponent processes general to biological systems act to limit reward.

    “As a result, the concept of anti-reward was developed,2 based on the proposal that opponent processes that are a general feature of biological systems also act to limit reward.”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [2] Koob, 2008, Addiction and the brain antireward system, Annu Rev Psychol source
    • cites [4] Koob, 1997, Drug abuse: hedonic homeostatic dysregulation, Science source

  • Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

    Interpretationnone given

    The within-system and between-system construct may also apply to the preoccupation/anticipation stage.

    “Thus, the within-system and between-system construct could be equally valid for the preoccupation/anticipation stage.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Premisecitation

    Craving is difficult to measure in human clinical studies and does not always correlate with relapse.

    “craving in itself has been diffi cult to measure in human clinical studies and does not always correlate with relapse.89”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [89] Tiffany, 2000, Challenges in the manipulation, assessment and interpretation of craving relevant variables, Addiction source

  • May combine two claims.

    Premisecitation

    These aversive states appear when the drug is removed during acute withdrawal and also during protracted abstinence.

    “These aversive states are manifest when the drug is removed during acute withdrawal but also during protracted abstinence.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [2] Koob, 2008, Addiction and the brain antireward system, Annu Rev Psychol source

  • May combine two claims.

    Premisecitation

    Imaging studies show baseline decreases in orbitofrontal and anterior cingulate function and dopamine function during dependence, with reactivation of dopamine and reward system function during acute craving episodes.

    “Indeed, imaging studies have revealed baseline decreases in orbitofrontal (medial and lateral) and anterior cingulate (ventral and dorsal) function and dopamine function during dependence, but reactivation of dopamine and reward system function during acute craving episodes.108”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [108] Volkow, 1999, Association of methylphenidate-induced craving with changes in right striato-orbitofrontal metabolism in cocaine abusers: implications in addiction, Am J Psychiatry source

  • May combine two claims.

    Interpretationnone given

    Decreases in reward can be driven by overactivation of the habenula or overactivation of the ventral striatal dynorphin system, both of which can decrease dopamine neuron firing.

    “Decreases in reward can be driven by overactivation of the habenula or overactivation of the dynorphin system in the ventral striatum, both of which can decrease dopamine neuron firing.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Interpretationcitation

    Anti-reward circuits are engaged as neuroadaptations during addiction development and produce aversive or stress-like states.

    “Anti-reward circuits are engaged as neuroadaptations during the development of addiction, producing aversive or stress-like states.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [2] Koob, 2008, Addiction and the brain antireward system, Annu Rev Psychol source

  • May combine two claims.

    Premisecitation

    Cue-induced reinstatement involves a glutamatergic projection from the prelimbic prefrontal cortex, basolateral amygdala, and ventral subiculum to the nucleus accumbens, and dopamine modulation in the basolateral amygdala and dorsal striatum.

    “Cue-induced reinstatement also involves a glutamatergic projection from the prelimbic prefrontal cortex, basolateral amygdala, and ventral subiculum to the nucleus accumbens, and dopamine modulation in the basolateral amygdala and dorsal striatum (tables 1, 2, circuits 14 and 15).51,52,95”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites [51] Vorel, 2001, Relapse to cocaine-seeking after hippocampal theta burst stimulation, Science source
    • cites [52] Everitt, 2002, Psychomotor stimulant addiction: a neural systems perspective, J Neurosci source
    • cites [95] Vanderschuren, 2005, Involvement of the dorsal striatum in cue-controlled cocaine seeking, J Neurosci source

  • May combine two claims.

    Premisecitation

    In PTSD there is substantial evidence of hypoactivity in the ventromedial prefrontal cortex and hyperactivity in the central nucleus of the amygdala, reflecting an inhibitory connection between them.

    “For example, in post-traumatic stress disorder there is substantial evidence of hypoactivity in the ventromedial prefrontal cortex and hyperactivity in the central nucleus of the amygdala that reflects an inhibitory connection between the ventromedial prefrontal cortex and central nucleus of the amygdala.133,134”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [133] Pitman, 2012, Biological studies of post-traumatic stress disorder, Nat Rev Neurosci source
    • cites [134] Mcdonald, 1996, Projections of the medial and lateral prefrontal cortices to the amygdala: a Phaseolus vulgaris leucoagglutinin study in the rat, Neuroscience source

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Activation of the dorsal anterior cingulate is associated with fear conditioning in post-traumatic stress disorder.

    “Activation of the dorsal anterior cingulate is also associated with fear conditioning in post-traumatic stress disorder.129”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [129] Bryant, 2005, Neural networks of information processing in posttraumatic stress disorder: a functional magnetic resonance imaging study, Biol Psychiatry source

  • Probably not a substantial claim: may not pass S4 (based).

    Interpretationnone given

    Neuroplastic changes are triggered and sustained by molecular and cellular adaptations that can presumably interact with genetic and environmental vulnerability to addiction.

    “The neuroplastic changes outlined previously are triggered and sustained by molecular and cellular adaptations that can presumably also interact with genetic and environmental vulnerability to addiction.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Premisenone given

    mTORC1 belongs to the PIKK family and plays a key role in dendritic translation of synaptic proteins.

    “The kinase mammalian (mechanistic) target of rapamycin complex 1 (mTORC1) belongs to the phosphoinositide 3-kinase (PI3K)-related kinase (PIKK) family and plays a key role in the dendritic translation of synaptic proteins.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Interpretationreasoning

    Under this framework, a Stop system would inhibit the Go craving system and stress system.

    “Under this framework, a Stop system would inhibit the Go craving system and stress system.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    Introduction of CREB in the nucleus accumbens decreases the reinforcing value of natural and drug rewards, plausibly contributing to withdrawal/negative affect stage-related decreases in reward pathway function and an amotivational, dysphoric, or depressed-like state.

    “Introduction of cAMP response element binding protein in the nucleus accumbens decreases the reinforcing value of natural and drug rewards, and this change plausibly contributes to withdrawal/negative affect stage-related decreases in reward pathway function, which leave a drug-abstinent individual in an amotivational, dysphoric, or depressed-like state.138,139”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [138] Carlezon, 1998, Regulation of cocaine reward by CREB, Science source
    • cites [139] Nestler, 2004, Molecular mechanisms of drug addiction, Neuropharmacology source

  • Classified as probably not a substantial claim. May combine two claims.

    Premisecitation

    Repeated substance use activates accumulating levels of ΔFosB, and animals with elevated ΔFosB exhibit exaggerated sensitivity to rewarding effects of drugs, leading to the hypothesis that ΔFosB might be a sustained molecular trigger or switch that helps initiate and maintain addiction.

    “For example, repeated substance use activates accumulating levels of ΔFosB, and animals with elevated ΔFosB exhibit exaggerated sensitivity to the rewarding effects of drugs of abuse, leading to the hypothesis that ΔFosB might be a sustained molecular trigger or switch that helps initiate and maintain a state of addiction.141,142”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [141] Nestler, 2005, Is there a common molecular pathway for addiction?, Nat Neurosci source
    • cites [142] Kelz, 1999, Expression of the transcription factor deltaFosB in the brain controls sensitivity to cocaine, Nature source

  • May combine two claims.

    Premisecitation

    In humans, only a few specific genes have been identified with polymorphisms that predispose or protect from drug addiction, but the number is growing.

    “In humans, only a few specific genes have been identified with polymorphisms (alleles) that either predispose an individual to or protect an individual from drug addiction,156 but the number is growing.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [156] Uhl, 2004, The burden of complex genetics in brain disorders, Arch Gen Psychiatry source

  • May combine two claims.

    Premisecitation

    Heritability of addictions is 40-60%, much caused by genetic variations affecting underlying neurobiological mechanisms, consistent with common pathways to different addictions.

    “Heritability of addictions is 40–60%, much of which is caused by genetic variations that affect underlying neurobiological mechanisms, and thus is consistent with there being common pathways to different addictions.152”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [152] Lerman, 2003, Elucidating the role of genetic factors in smoking behavior and nicotine dependence, Am J Med Genet B Neuropsychiatr Genet source

  • May combine two claims.

    Premisenone given

    Chronic exposure to a wide variety of abused drugs upregulates cAMP formation, PKA activity, and PKA-dependent protein phosphorylation in the nucleus accumbens.

    “For example, chronic exposure to a wide variety of abused drugs upregulates cAMP formation, cAMP-dependent protein kinase A (PKA) activity, and PKA-dependent protein phosphorylation in the nucleus accumbens.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisenone given

    Chronic exposure to various drugs of abuse increases activation of cAMP response element binding protein in the nucleus accumbens and deactivates it in the central nucleus of the amygdala.

    “A well characterised example is that chronic exposure to various drugs of abuse increases the activation of cAMP response element binding protein in the nucleus accumbens and deactivates it in the central nucleus of the amygdala.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    GABA co-release is modulated by binge-like doses of alcohol in mice, and diminished ALDH1a1 leads to enhanced alcohol consumption and preference.

    “GABA co-release is modulated by binge-like doses of alcohol administered to mice, and diminished ALDH1a1 leads to enhanced alcohol consumption and preference.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Interpretationreasoning

    Although such approaches do not guarantee genes convey vulnerability in humans, they provide viable candidates for exploring genetic basis of endophenotypes associated with addiction.

    “Although such approaches do not guarantee that these genes convey vulnerability in the human population, they provide viable candidates for exploring the genetic basis of endophenotypes that are associated with addiction.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Interpretationnone given

    Identification of molecular and neurochemical loads on the circuitry provides key information about vulnerability, resilience, treatment, recovery from addiction, and how different drugs enter the addiction cycle.

    “Identification of these molecular and neurochemical loads on the circuitry provides key information about vulnerability, resilience, treatment, and recovery from addiction, as well as information on how different drugs of abuse enter the overall addiction cycle.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    Beginning in preadolescence and continuing into the mid-20s, cortical grey matter volumes reduce reflecting normal pruning; white matter volume increases over adolescence reflecting increased connectivity including axonal extension and myelination.

    “Beginning in preadolescence and continuing into the mid-20s, cortical grey matter volumes reduce, which reflects a normal pruning process;168 white matter volume increases over the course of adolescence, reflecting increases in connectivity, including axonal extension and myelination.168”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [168] Giedd, 1999, Brain development during childhood and adolescence: a longitudinal MRI study, Nat Neurosci source

  • May combine two claims.

    Premisereasoning

    Non-drug addictions elaborate self-regulation failures similarly to drug addictions, with transitions from impulsivity to compulsivity and a chronic relapsing trajectory.

    “Non-drug addictions elaborate self-regulation failures similarly to drug addictions, with transitions from impulsivity to compulsivity and a chronic relapsing trajectory.”
    Quote in the paperSubstantial claim

  • Probably not a substantial claim: may not pass S4 (based).

    Premisenone given

    Non-drug addictions such as pathological gambling have a similar behavioural phenotype that fits into the three-stage cycle.

    “Non-drug addictions, such as pathological gambling, have a similar behavioural phenotype that fits into the three-stage cycle.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Premisecitation

    Environmental factors consistently associated with propensity to self-administer drugs include structural factors such as low socioeconomic status and lack of social support, proximal factors such as parental drug use, poor parenting, parental depression, and sibling and peer influences, and distal factors such as drug availability, school, neighbourhood, advertising, and media.

    “Environmental factors that have been consistently associated with the propensity to self-administer drugs include structural factors (eg, low socioeconomic status and associated lack of social support systems), proximal factors (eg, parental drug use and dependence, as per the DSM-IV, poor quality of parenting, parental depression, and sibling and peer influences), and more distal factors (eg, dru”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [177] Hawkins, 1992, Risk and protective factors for alcohol and other drug problems in adolescence and early adulthood: implications for substance abuse prevention, Psychol Bull source
    • cites [178] Sloboda, 2012, Revisiting the concepts of risk and protective factors for understanding the etiology and development of substance use and substance use disorders: implications for prevention, Subst Use Misuse source

  • Classified as probably not a substantial claim.

    Interpretationreasoning

    The heuristic framework presents addiction as three stages linked by three functional domains mediated by three major neurobiological circuits (basal ganglia, extended amygdala, prefrontal cortex) and numerous microcircuits of neuroplasticity.

    “We elaborate here a heuristic framework based on the behavioural and imaging phenotypes of addiction as three stages linked by three functional domains that are mediated by three major neurobiological circuits (basal ganglia, extended amygdala, and prefrontal cortex) and numerous microcircuits of neuroplasticity.”
    Quote in the paperSubstantial claim
73 of 73

  • The paper relies on this without support.

    Neurobiological mechanisms identified in rodent models of reinstatement and craving correspond to the circuits that mediate human addiction.

    “Evidence from rodent studies suggests that drug-induced reinstatement is mediated by the circuit that links the prelimbic prefrontal cortex to the ventral striatum94 (for correspondence with humans, see figure 2; tables 1, 2, circuits 12 and possibly 13).”
    “In humans, cue-induced craving appears to involve activation of similar circuits, in which cues that are associated with drugs and elements of non-drug addictions produce activation of the prefrontal cortex, including the dorsolateral prefrontal cortex, anterior cingulate gyrus, and medial orbitofrontal cortex.101–105”
1 of 1

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Problematic social media use (PSMU) parallels traditional characteristics of substance use disorders, including salience, functional impairment, and tolerance.

    “Problematic social media use (PSMU) parallels traditional characteristics of substance use disorders, including salience, functional impairment, and tolerance.”

    From Problematic social media use and inhibitory control among post-secondary students (2025) · cites this paper as Koob & Volkow, 2016

    The “Relevance to behavioural addictive disorders” section says that internet addiction and other non-drug addictions share features with drug addiction, while the “preoccupation/anticipation” section describes excessive salience of drug-related cues. The paper does not establish that problematic social media use specifically has these parallels, or that its parallels include functional impairment and tolerance. Page numbers were not available in our copy. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

  • Upregulation of CRF in the amygdala plays a role in negative emotional states during drug withdrawal.

    “Upregulation of CRF in the amygdala in turn plays a role in negative emotional states dur ing drug withdrawal 51 .”

    From Substance use disorders: a comprehensive update of classification, epidemiology, neurobiology, clinical aspects, treatment and prevention (2023) · cites this paper as [51]

  • There is a growing consensus that SUDs, once developed, tend to be chronic disorders, reflecting long-lasting changes in brain function exacerbated by cumulative mental health and social consequences.

    “There is a growing consensus that SUDs, once developed, tend to be chronic disorders 161 , reflecting long- lasting changes in brain function 50,51 , that are exacerbated by the cumulative mental health and social consequences that they trigger.”

    From Substance use disorders: a comprehensive update of classification, epidemiology, neurobiology, clinical aspects, treatment and prevention (2023) · cites this paper as [51]

  • Stress plays a powerful role in the initiation, escalation, and relapse to drug abuse via dopaminergic mechanisms.

    “such that stress plays a powerful role in the initiation, escalation, and relapse to drug abuse via dopaminergic mechanisms (Koob and Volkow, 2016).”

    From The effects of psychosocial stress on dopaminergic function and the acute stress response (2019) · cites this paper as Koob and Volkow, 2016

  • Addiction is best regarded as a cycle of compulsive substance use subserved by dysregulation in neural circuitry governing motivation and hedonic experience, habit behavior, and executive function.

    “addiction is best regarded as a cycle of compulsive substance use subserved by dysregulation in neural circuitry governing motivation and hedonic experience, habit behavior, and executive function [1].”

    From Mindfulness-based treatment of addiction: current state of the field and envisioning the next wave of research (2018) · cites this paper as [1]

Cites

Flagged first, then by citations

8 of the 199 references couldn’t be matched to a known paper.

Research works printed but not linked: 1

  1. Volkow, 2006, Altered pathways: drug abuse and age of onset, Addict Professional, 26, 29

Cited by

Sorted by citations

Related

Authors
Koob, G. F., & Volkow, N. D.
Affiliations
National Institutes of Health (US)
Corresponding author
Koob, George F
ORCID
Venue
The Lancet Psychiatry
Publisher
Elsevier BV
Published
2016-08
Volume
3
Issue
8
Pages
760-773
ISSN
2215-0366 (ISSN-L)
DOI
10.1016/s2215-0366(16)00104-8
PMC
PMC6135092
OpenAlex
W2491859250
Semantic Scholar
2394bfa642d20cb2f5bcc54ba45b41651539e825
Cited by
3,698
References
199
Citations by year
2026: 507 · 2025: 488 · 2024: 437 · 2023: 423 · 2022: 393 · 2021: 441 · 2020: 359 · 2019: 262 · 2018: 235 · 2017: 136 · 2016: 15
FWCI
23.74
Type
journal article
Language
en
Open access
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations
  • The Lancet Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institutes of Health (Z99‐AA999999)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
  • Health Sciences › Medicine › Epidemiology › Substance Abuse Treatment and Outcomes
Keywords
drug addiction, neurocircuitry, incentive salience, basal ganglia, dopamine, opioid peptides, extended amygdala, corticotropin-releasing factor, dynorphin, stress response, withdrawal, craving, executive function, prefrontal cortex, insula, glutamate, addiction relapse, addiction vulnerability, transcription factors
MeSH terms
Brain, Humans, Neural Pathways, Neurobiology, Substance-Related Disorders

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read under definition version 3 (extract-v3) on 2026-09-28.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-09-28.

Cited sources are checked by gpt-6-sol.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

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