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Cited by 494Attention Deficit Hyperactivity DisorderNeurotransmitter Receptor Influence on BehaviorNeural and Behavioral Psychology Studies

Catecholamine Influences on Dorsolateral Prefrontal Cortical Networks

Open access
Arnsten, Amy F.T.·2011·Biological Psychiatry
DOI 10.1016/j.biopsych.2011.01.027PMC PMC3145207
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Abstract

The symptoms of attention-deficit/hyperactivity disorder (ADHD) involve impairments in prefrontal cortical top-down regulation of attention and behavior. All current pharmacological treatments for ADHD facilitate catecholamine transmission, and basic research suggests that these compounds have prominent actions in the prefrontal cortex (PFC). The dorsolateral PFC is especially sensitive to levels of norepinephrine and dopamine, whereby either too little or too much markedly impairs PFC function. Recent physiological studies have shown that norepinephrine strengthens PFC network connectivity and maintains persistent firing during a working memory task through stimulation of postsynaptic α(2A)-adrenoceptors on PFC neurons. Conversely, dopamine acts at D1 receptors to narrow spatial tuning, sculpting network inputs to decrease noise (i.e., stabilization of the representation). The stimulant medications and atomoxetine appear to enhance PFC function by indirectly increasing these catecholamine actions through blockade of norepinephrine and/or dopamine transporters. In contrast, guanfacine mimics the enhancing effects of norepinephrine at postsynaptic α(2A)-receptors in the PFC, strengthening network connectivity. Stronger PFC regulation of attention, behavior, and emotion likely contributes to the therapeutic effects of these medications for the treatment of ADHD.

AI snapshot

Written from the paper’s full text.

TL;DR

This review argues that dorsolateral prefrontal cortex function depends on an inverted-U level of norepinephrine and dopamine, with norepinephrine α2A receptors strengthening network connectivity and dopamine D1 receptors narrowing spatial tuning. ADHD medications likely work by indirectly increasing or mimicking these catecholamine actions to improve prefrontal top-down regulation.

Key findings

  • Norepinephrine and dopamine both show inverted-U effects on dorsolateral prefrontal working memory: moderate arousal-related release improves function, while depletion/fatigue or stress-level release impairs it. Norepinephrine α2A stimulation enhances delay-period firing for preferred directions by inhibiting cAMP-HCN signaling, whereas α1/β1 stimulation under stress impairs prefrontal function.
  • Dopamine D1/5 stimulation has a complementary sculpting role: optimal levels suppress firing to nonpreferred directions and sharpen spatial tuning, while high D1/5 stimulation suppresses all firing and impairs working memory. D2 receptors mainly affect response-related firing rather than delay-period firing.
  • ADHD medications act through catecholamine mechanisms: methylphenidate blocks norepinephrine and dopamine transporters and is more potent for norepinephrine than dopamine in rat prefrontal cortex; atomoxetine blocks the norepinephrine transporter and raises both norepinephrine and dopamine in prefrontal cortex; guanfacine directly mimics norepinephrine at postsynaptic α2A receptors. Atomoxetine at 40 mg increased right inferior prefrontal activity during a stop-signal task, while a much higher dose impaired go/no-go performance.
  • Blocking α2 receptors in monkey dorsolateral prefrontal cortex reproduces ADHD-like symptoms: yohimbine infusions induced locomotor hyperactivity, no-go commission errors, and working memory deficits. Genetic variants in dopamine β-hydroxylase and the α2A receptor have been associated with ADHD and impaired prefrontal executive function.

Methods

  • Narrative review synthesizing basic and clinical literature on catecholamine modulation of dorsolateral prefrontal cortical networks, with emphasis on working memory circuits.
  • Evidence base includes monkey electrophysiology and iontophoresis during spatial working memory tasks, rodent biochemistry and slice physiology, and human pharmacological, imaging, and genetic studies.
  • Main analysis is conceptual integration of receptor-specific mechanisms (α2A, α1, β, D1/5, D2) and medication effects; no systematic search or meta-analysis is described.

Limitations

  • Stated in the paper: PET imaging cannot detect dopamine interactions with receptors in prefrontal cortex; available D1 drugs act at both D1 and D5, so pharmacological studies cannot separate these mechanisms; D2 response-cell microcircuitry is less understood and it is unknown whether GABA interneurons influence response cells; D1 agonists likely cannot reproduce the dynamic range of endogenous dopamine; the proposed atomoxetine dose-response hypothesis remains to be tested.
  • Stated in the paper: human guanfacine evidence is mixed, with some studies showing cognitive improvement and at least one (Muller et al.) finding no effects on executive or memory functions in healthy volunteers.
  • Evident from the text: this is a narrative review rather than a primary study, with much mechanistic evidence from nonhuman animals and a focus on dorsolateral prefrontal spatial working memory; human causal and prefrontal receptor imaging data are limited.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1016/j.biopsych.2011.01.027

Cites

138 of 138 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

10 of 73 cited sources checked · 3 supported · 0 flagged · accuracy not yet measured

  • Premisereasoning

    Stimulant medications and atomoxetine enhance PFC function by indirectly increasing these catecholamine actions through blockade of norepinephrine and/or dopamine transporters.

    “The stimulant medications and atomoxetine appear to enhance PFC function by indirectly increasing these catecholamine actions through blockade of norepinephrine and/or dopamine transporters.”
    Quote in the paperSubstantial claim1 of 2 sources checked
    • cites [83] Berridge, 2006, Methylphenidate preferentially increases catecholamine neurotransmission within the prefrontal cortex at low doses that enhance cognitive function, Biol Psychiatry source
    • cites [90] Bymaster, 2002, Atomoxetine increases extracellular levels of norepinephrine and dopamine in prefrontal cortex of rat: A potential mechanism for efficacy in attention deficit/hyperactivity disorder, Neuropsychopharmacology source
  • Premisecitation

    In rodent medial PFC, D2 receptor stimulation can reduce GABAergic inputs to pyramidal cells.

    “Research in rodent medial PFC has shown that D2 receptor stimulation can reduce GABAergic inputs to pyramidal cells (130).”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites [130] Seamans, 2001, Bidirectional dopamine modulation of GABAergic inhibition in prefrontal cortical pyramidal neurons, J Neurosci source
  • Premisecitation

    Infusion of an α1 agonist directly into the dorsolateral PFC impairs working memory performance.

    “In contrast to α2A receptors, infusion of an α1 agonist directly into the dorsolateral PFC impairs working memory performance (42).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [42] Mao, 1999, Local infusion of an alpha-1 adrenergic agonist into the prefrontal cortex impairs spatial working memory performance in monkeys, Biol Psychiatry source
  • Premisecitation

    Guanfacine administration to children with ADHD and tics improved performance of a Conners' Continuous Performance Test task that requires sustained attention, working memory, and behavioral inhibition.

    “Guanfacine administration to children with ADHD and tics improved performance of a Conners’ Continuous Performance Test task that requires sustained attention, working memory, and behavioral inhibition (95).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [95] Scahill, 2001, A placebo-controlled study of guanfacine in the treatment of children with tic disorders and attention deficit hyperactivity disorder, Am J Psychiatry source
  • Premisecitation

    Depletion of catecholamines from the dorsolateral PFC is as detrimental as ablation of the cortical tissue itself.

    “This research began with the landmark discovery that depletion of catecholamines from the dorsolateral PFC was as detrimental as ablation of the cortical tissue itself (4).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [4] Brozoski, 1979, Cognitive deficit caused by regional depletion of dopamine in prefrontal cortex of rhesus monkey, Science source
  • May combine two claims. 20
  • Classified as probably not a substantial claim. 1

  • May combine two claims.

    Premisecitation

    Systemic administration of an α1 agonist that crosses the blood brain barrier impairs working memory performance, while administration of an α1 antagonist, e.g., prazosin, can protect working memory performance during stress.

    “Systemic administration of an α1 agonist that crosses the blood brain barrier also impairs working memory performance, while administration of an α1 antagonist, e.g., prazosin, can protect working memory performance during stress (37,50,51).”
    Quote in the paperSubstantial claim2 of 3 sources checked
    • cites [37] Birnbaum, 1999, A role for norepinephrine in stress-induced cognitive deficits: Alpha-1-adrenoceptor mediation in the prefrontal cortex, Biol Psychiatry source

      The Discussion reports that α1 stimulation in the prefrontal cortex impairs spatial working memory and that intra-PFC urapidil reversed a pharmacological stressor’s effect on response accuracy in rats (page not available in our copy). It does not establish that a blood–brain-barrier-crossing α1 agonist was administered systemically, or that prazosin protected working memory during stress; its prazosin example concerns performance under nonstress conditions. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
    • cites [50] Arnsten, 1997, The alpha-1 adrenergic agonist, cirazoline, impairs spatial working memory performance in aged monkeys, Pharmacol Biochem Behav source

      The Drug Administration and Results sections report systemic cirazoline treatment in aged monkeys, impaired spatial working memory, and reversal of that impairment by prazosin (page numbers unavailable). The Discussion proposes that α1 mechanisms may contribute to cognitive impairment during stress, but the paper does not show that prazosin protects working memory during stress. It describes cirazoline's brain penetrance as purported rather than directly demonstrating it. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
    • cites [51] Arnsten, 1999, Alpha-1 noradrenergic receptor stimulation impairs prefrontal cortical cognitive function, Biol Psychiatry source

  • May combine two claims.

    Premisecitation

    Atomoxetine blocks the norepinephrine transporter, and as the norepinephrine transporter clears both norepinephrine and dopamine in the PFC, this increases extracellular levels of both catecholamines.

    “Like methylphenidate, atomoxetine also blocks the NE transporter (Figure 2E), and as the NE transporter clears both NE and DA in the PFC, this increases extracellular levels of both catecholamines (90).”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [90] Bymaster, 2002, Atomoxetine increases extracellular levels of norepinephrine and dopamine in prefrontal cortex of rat: A potential mechanism for efficacy in attention deficit/hyperactivity disorder, Neuropsychopharmacology source

      The Discussion (page unavailable) reports that atomoxetine inhibits the NE transporter, that this transporter takes up dopamine in the PFC, and that atomoxetine increases extracellular NE and dopamine there. It presents transporter-mediated dopamine clearance as a proposed explanation, however, and says other interactions may also contribute; the citing sentence states that causal explanation more definitively than the paper does. (LLM, conf=0.82)

      Experimental — accuracy not yet measured

  • May combine two claims.

    Premisecitation

    Methylphenidate blocks both norepinephrine and dopamine transporters, and has more potent effects on norepinephrine than dopamine in the rat PFC.

    “A common misconception is that methylphenidate is a selective DA transporter blocker, when in actuality it blocks both NE and DA transporters. Indeed, methylphenidate has more potent effects on NE than DA in the rat PFC (83) (84).”
    Quote in the paperSubstantial claim1 of 2 sources checked
    • cites [83] Berridge, 2006, Methylphenidate preferentially increases catecholamine neurotransmission within the prefrontal cortex at low doses that enhance cognitive function, Biol Psychiatry source
    • cites [84] Berridge, 2011, Psychostimulants as cognitive enhancers: The prefrontal cortex, catecholamines, and attention-deficit/hyperactivity disorder, Biol Psychiatry source

      The section “Neurochemical Actions of Low-Dose Psychostimulants” (page not supplied) states that methylphenidate blocks both NE and DA reuptake and increases both in the rat PFC. It does not say that its effects on NE are more potent than its effects on DA in the rat PFC. (LLM, conf=0.86)

      Experimental — accuracy not yet measured

  • May combine two claims.

    Premisecitation

    Moderate levels of norepinephrine released during alert, nonstressed waking improve working memory performance by engaging postsynaptic α2A receptors, whereas high levels of norepinephrine released during stress impair PFC function via stimulation of lower affinity α1 and β1 receptors.

    “Data from studies of monkey dorsolateral PFC demonstrate an inverted-U dose-response: moderate levels of NE released during alert, nonstressed waking improve working memory performance by engaging postsynaptic, α2A receptors (35,36), whereas high levels of NE released during stress impair PFC function via stimulation of lower affinity α1 (37) and β1 receptors (38).”
    Quote in the paperSubstantial claim1 of 4 sources checked
    • cites [35] Arnsten, 1985, Alpha 2-adrenergic mechanisms in prefrontal cortex associated with cognitive decline in aged nonhuman primates, Science source
    • cites [36] Li, 1994, Delayed-response deficit induced by local injection of the alpha 2-adrenergic antagonist yohimbine into the dorsolateral prefrontal cortex in young adult monkeys, Behav Neural Biol source
    • cites [37] Birnbaum, 1999, A role for norepinephrine in stress-induced cognitive deficits: Alpha-1-adrenoceptor mediation in the prefrontal cortex, Biol Psychiatry 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 [38] Ramos, 2005, The beta-1 adrenergic antagonist, betaxolol, improves working memory performance in rats and monkeys, Biol Psychiatry source

  • May combine two claims.

    Premisecitation

    Norepinephrine has the highest affinity for α2 adrenergic receptors and lower affinity for α1 and β receptors.

    “Norepinephrine has the highest affinity for α2 adrenergic receptors and lower affinity for α1 and β receptors (34).”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [34] Arnsten, 2000, Through the looking glass: Differential noradenergic modulation of prefrontal cortical function, Neural Plast source

  • May combine two claims.

    Premisecitation

    Either blockade of D1/5 receptors or excessive stimulation of D1/5 receptors in the PFC impairs spatial working memory.

    “Cognitive studies in animals have shown that either blockade of D1/5 receptors or excessive stimulation of D1/5 receptors in the PFC impairs spatial working memory (106–108).”
    Quote in the paperSubstantial claim1 of 3 sources checked
    • cites [106] Arnsten, 1990, Stress impairs prefrontal cortex cognitive function in monkeys: Role of dopamine, Soc Neurosci Abstr

      Not checked in the free run.

    • cites [107] Sawaguchi, 1991, D1 dopamine receptors in prefrontal cortex: Involvement in working memory, Science source
    • cites [108] Zahrt, 1997, Supranormal stimulation of D1 dopamine receptors in the rodent prefrontal cortex impairs spatial working memory performance, J Neurosci source

      The paper reports that excessive D1 receptor stimulation in rat PFC impaired delayed-alternation performance, a spatial working-memory task. Its introduction also describes evidence that insufficient D1 stimulation impairs PFC cognition, but this study’s antagonist dose alone did not impair performance (Experiment 2, page unavailable). The passages identify D1 receptors, not D1/5 receptors, so the D5 part of the claim is not established by this source. (LLM, conf=0.86)

      Experimental — accuracy not yet measured

  • May combine two claims.

    Premisecitation

    D2 receptors are less prevalent in monkey dorsolateral PFC and are concentrated on layer V neurons, the layer that projects to striatum and the superior colliculus.

    “The D2 receptors are less prevalent in monkey dorsolateral PFC and are concentrated on layer V neurons, the layer that projects to striatum and the superior colliculus (98,122,123).”
    Quote in the paperNot a substantial claim1 of 3 sources checked
    • cites [98] Lidow, 1998, Layer V neurons bear the majority of mRNAs encoding the five distinct dopamine receptor subtypes in the primate prefrontal cortex, Synapse source
    • cites [122] Lidow, 1989, Dopamine D2 receptors in the cerebral cortex: Distribution and pharmacological characterization with [3H]raclopride, Proc Natl Acad Sci U S A source

      The Discussion reports that D2 binding sites are considerably less concentrated in primate cortex than in the neostriatum, and the Results report binding in monkey prefrontal cortex. The paper does not establish that receptors are concentrated on layer V neurons or identify layer V projections to the striatum and superior colliculus; it measures binding by cortical region, not neuronal layer. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
    • cites [123] Lidow, 1991, Distribution of dopaminergic receptors in the primate cerebral cortex: quantitative autoradiographic analysis using [3H]raclopride, [3H]spiperone and [3H]SCH23390, Neuroscience source

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

    Premisecitation

    Dopamine neurons fire related to prediction of reward.

    “Dopamine neurons have not been followed as methodically with regard to states of arousal but have been shown to fire related to prediction of reward (28).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [28] Schultz, 1998, The phasic reward signal of primate dopamine neurons, Adv Pharmacol source

  • May combine two claims.

    Premisecitation

    Stimulation of α2A receptors increases delay-related firing of PFC neurons via inhibition of cyclic adenosine monophosphate (cAMP), while stimulation of α1 receptors decreases delay-related firing via activation of phosphatidylinositol protein kinase C signaling.

    “Stimulation of α2A receptors increases delay-related firing of PFC neurons via inhibition of cyclic adenosine mono-phosphate (cAMP) (57), while stimulation of α1 receptors decreases delay-related firing via activation of phosphatidylinositol protein kinase C signaling (58).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [57] Wang, 2007, Alpha2A-adrenoceptors strengthen working memory networks by inhibiting cAMP-HCN channel signaling in prefrontal cortex, Cell source
    • cites [58] Birnbaum, 2004, Protein kinase C overactivity impairs prefrontal cortical regulation of working memory, Science source

  • May combine two claims.

    Interpretationcitation

    Stimulation of α2A receptors strengthens firing for the neuron's preferred direction by inhibiting cAMP production, which, in turn, reduces cAMP opening of potassium channels, increasing the efficacy of nearby synaptic inputs.

    “Stimulation of α2A receptors strengthens firing for the neuron’s preferred direction by inhibiting cAMP production, which, in turn, reduces cAMP opening of potassium channels, increasing the efficacy of nearby synaptic inputs (Figure 2E).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [57] Wang, 2007, Alpha2A-adrenoceptors strengthen working memory networks by inhibiting cAMP-HCN channel signaling in prefrontal cortex, Cell source

  • May combine two claims.

    Premisecitation

    The dorsolateral PFC is especially sensitive to levels of norepinephrine and dopamine, whereby either too little or too much markedly impairs PFC function.

    “The dorsolateral PFC is especially sensitive to levels of norepinephrine and dopamine, whereby either too little or too much markedly impairs PFC function.”
    Quote in the paperSubstantial claim0 of 4 sources checked
    • cites [4] Brozoski, 1979, Cognitive deficit caused by regional depletion of dopamine in prefrontal cortex of rhesus monkey, Science source
    • cites [5] Arnsten, 1985, Stress produces opioid-like effects on investigatory behavior, Pharmacol Biochem Behav source
    • cites [6] Roberts, 1994, 6-Hydroxydopamine lesions of the prefrontal cortex in monkeys enhance performance on an analog of the Wisconsin Card Sort Test: Possible interactions with subcortical dopamine, J Neurosci source
    • cites [7] Robbins, 2007, Differential regulation of fronto-executive function by the monoamines and acetylcholine, Cereb Cortex source

  • May combine two claims.

    Premisecitation

    Depletion of norepinephrine or blockade of α2A receptors in PFC impairs working memory performance in monkeys.

    “Either depletion of NE (35) or blockade of α2A receptors in PFC (36) impairs working memory performance in monkeys, suggesting that endogenous NE plays a large role in strengthening working memory performance.”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [35] Arnsten, 1985, Alpha 2-adrenergic mechanisms in prefrontal cortex associated with cognitive decline in aged nonhuman primates, Science source
    • cites [36] Li, 1994, Delayed-response deficit induced by local injection of the alpha 2-adrenergic antagonist yohimbine into the dorsolateral prefrontal cortex in young adult monkeys, Behav Neural Biol source

  • May combine two claims.

    Premisecitation

    Norepinephrine neurons in the locus coeruleus are silent during rapid eye movement sleep, have low tonic firing during slow wave sleep, moderate tonic and pronounced phasic firing to relevant stimuli during nonstressed waking, and high tonic firing with dysregulated phasic firing during stress.

    “Norepinephrine neurons in the locus coeruleus are silent during rapid eye movement sleep and have low tonic firing during slow wave sleep, moderate tonic firing and pronounced phasic firing to relevant stimuli during nonstressed waking, and high tonic firing with dysregulated phasic firing during stress (27).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [27] Aston-Jones, 1999, Role of locus coeruleus in attention and behavioral flexibility, Biol Psychiatry source

  • May combine two claims.

    Interpretationreasoning

    Norepinephrine and dopamine have complementary effects on the strength of PFC network connections, with norepinephrine strengthening connectivity via α2A receptor stimulation and dopamine sculpting network inputs via D1 receptors.

    “These studies have revealed that NE and DA have complementary effects on the strength of PFC network connections, with NE strengthening connectivity via α2A receptor stimulation and DA sculpting network inputs via D1 receptors.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Premisecitation

    Iontophoresis of an α2A agonist such as guanfacine onto PFC neurons enhances neuronal firing during the delay period for the neurons' preferred direction, while blockade of α2A receptors markedly reduces PFC neuronal firing during the delay period.

    “Iontophoresis of an α2A agonist such as guanfacine onto PFC neurons enhances neuronal firing during the delay period for the neurons’ preferred direction (Figure 3A), while blockade of α2A receptors markedly reduces PFC neuronal firing during the delay period (indeed, high doses can silence a neuron) (57,61).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [57] Wang, 2007, Alpha2A-adrenoceptors strengthen working memory networks by inhibiting cAMP-HCN channel signaling in prefrontal cortex, Cell source
    • cites [61] Li, 1999, Alpha-2 adrenergic modulation of prefrontal cortical neuronal activity related to spatial working memory in monkeys, Neuropsychopharmacology source

  • May combine two claims.

    Premisecitation

    All medications currently approved for the treatment of ADHD influence norepinephrine transmission, and all can improve at least some aspects of PFC function.

    “All medications currently approved for the treatment of ADHD influence NE transmission (Figure 2E), and all can improve at least some aspects of PFC function (82).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [82] Chamberlain, 2011, Translational approaches to frontostriatal dysfunction in attention-deficit/hyperactivity disorder using a computerized neuropsychological battery, Biol Psychiatry source

  • May combine two claims.

    Premisecitation

    In animals, the enhancing effects of methylphenidate and atomoxetine on working memory performance involve D1/5 receptor stimulation and NE α2 receptor actions.

    “Animal studies have also shown that the enhancing effects of methylphenidate and atomoxetine on working memory performance involve D1/5 receptor stimulation, as well as the NE α2 receptor actions described above.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Interpretationnone given

    Catecholamine actions on dorsolateral PFC microcircuitry regulate the strength of persistent neuronal firing and the degree of neuronal tuning.

    “Studies of catecholamine actions on dorsolateral PFC microcircuitry have revealed intricate and powerful mechanisms to regulate the strength of persistent neuronal firing and the degree of neuronal tuning.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    Iontophoresis of D2 drugs onto PFC neurons has no effect on delay cell firing during the delay period in a working memory task but has marked effects on response cell firing in relationship to the eye movement response.

    “Iontophoresis of D2 drugs onto PFC neurons has no effect on delay cell firing during the delay period in a working memory task but has marked effects on response cell firing in relationship to the eye movement response (124).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [124] Wang, 2004, Selective D2 receptor actions on the functional circuitry of working memory, Science source

  • May combine two claims.

    Premisecitation

    Stimulants likely enhance motivation and other striatal functions not engaged by NE medications.

    “On the other hand, stimulants likely enhance motivation and other striatal functions not engaged by NE medications (135).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [135] Cousins, 1996, Nucleus accumbens dopamine depletions alter relative response allocation in a T-maze cost/benefit task, Behav Brain Res source

  • May combine two claims.

    Interpretationcitation

    Dopamine and norepinephrine have complementary roles: norepinephrine α2A receptor stimulation enhances network firing for shared, preferred inputs (i.e., increasing signals), whereas D1 receptor stimulation sculpts neuronal firing by decreasing firing to nonpreferred inputs (i.e., decreasing noise).

    “Thus, DA and NE have complementary roles: NE α2A receptor stimulation enhances network firing for shared, preferred inputs (i.e., increasing signals [57]), whereas D1 receptor stimulation sculpts neuronal firing by decreasing firing to nonpreferred inputs (i.e., decreasing noise [109]).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [57] Wang, 2007, Alpha2A-adrenoceptors strengthen working memory networks by inhibiting cAMP-HCN channel signaling in prefrontal cortex, Cell source
    • cites [109] Vijayraghavan, 2007, Inverted-U dopamine D1 receptor actions on prefrontal neurons engaged in working memory, Nat Neurosci source
21 of 21

  • The paper relies on this without support.

    Many symptoms of ADHD arise from dysfunction of the prefrontal cortex and its connections with cortical and subcortical brain regions.

    “As described in this special issue, many of the symptoms of attention-deficit/hyperactivity disorder (ADHD) are thought to arise from dysfunction of the prefrontal cortex (PFC) and its connections with cortical and subcortical brain regions.”

  • The paper relies on this without support.

    Prefrontal cortex networks are able to represent information in the absence of bottom-up external stimulation, but this fragile process is tremendously dependent on the correct neurochemical environment.

    “Prefrontal cortex networks are able to represent information in the absence of bottom-up external stimulation, but this fragile process is tremendously dependent on the correct neurochemical environment, whereby arousal pathways coordinate cognitive state with environmental events.”
2 of 2

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?

  • Microdialysis studies suggest that atomoxetine may selectively increase dopamine levels in the prefrontal cortex, via the norepinephrine transporter or perhaps via a secondary signaling mechanism.

    “microdialysis studies suggest that atomoxetine may selectively increase dopamine levels in the prefrontal cortex, via the norepinephrine transporter or perhaps via a secondary signaling mechanism [23].”

    From Atomoxetine Effects on Executive Function as Measured by the BRIEF-A in Young Adults with ADHD: A Randomized, Double-Blind, Placebo-Controlled Study (2014) · cites this paper as [23]

    In “NE Mechanisms and ADHD Medications” (page unavailable), the paper says atomoxetine blocks the norepinephrine transporter, which clears dopamine in the PFC, increasing extracellular dopamine and norepinephrine there. It does not describe a secondary signaling mechanism or establish that the dopamine increase is selective to the PFC. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

  • Excessive DA stimulation might cause PFC dysfunction leading to impaired inhibition of undesirable behavior and a deficit in sustaining attention.

    “However, excessive DA stimulation might cause PFC dysfunction leading to impaired inhibition of undesirable behavior, and a deficit in sustaining attention, as these two behaviors are highly regulated by dopaminergic release in the PFC (Russell, 2003; Brennan and Arnsten, 2008; Arnsten, 2011).”

    From The Effects of Methylphenidate on Goal-directed Behavior in a Rat Model of ADHD (2015) · cites this paper as Arnsten, 2011

  • Reduced catecholamine transmission has been linked to ADHD, while overamplified noradrenergic transmission is associated with PTSD.

    “Reduced catecholamine transmission has been linked to ADHD, while overamplified noradrenergic transmission is associated with PTSD 46.”

    From Mechanisms of synaptic transmission dysregulation in the prefrontal cortex: pathophysiological implications (2022) · cites this paper as [46]

  • Stimulation of D1R produces an inverted-U dose response on PFC neuronal firing and cognitive performance during working memory tasks.

    “Stimulation of D1R produces an inverted-U dose response on PFC neuronal firing and cognitive performance during working memory tasks 46.”

    From Mechanisms of synaptic transmission dysregulation in the prefrontal cortex: pathophysiological implications (2022) · cites this paper as [46]

  • Norepinephrine and dopamine are believed to modulate attention and other cognitive capabilities, generally with dose-response following classic inverted-U shaped curves.

    “Norepinephrine (NE) and dopamine (DA) are believed to modulate attention and other cognitive capabilities105, generally with dose–response following classic inverted-U shaped curves.”

    From Paying attention to attention in depression (2019) · cites this paper as [105]

Cites

Flagged first, then by citations

1 of the 139 references couldn’t be matched to a known paper.

Research works printed but not linked: 3

  1. Matsumoto, 2008, Excitatory and inhibitory responses of midbrain dopamine neurons to cues predicting aversive stimuli, Soc Neurosci Abstr, 691, 24
  2. Eagle, 2010, Beta-adrenoceptor-mediated action of atomoxetine during behavioral inhibition on the stop-signal task in rats, Soc Neurosci Abstr, 508, 510
  3. Arnsten, 1990, Stress impairs prefrontal cortex cognitive function in monkeys: Role of dopamine, Soc Neurosci Abstr, 16, 164

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Related

Authors
Arnsten, A. F. T.
Affiliations
Yale University (US)
Corresponding author
Arnsten, Amy F.T.
ORCID
Arnsten, Amy F.T.
Venue
Biological Psychiatry
Publisher
Elsevier BV
Published
2011-06
Volume
69
Issue
12
Pages
e89-e99
ISSN
0006-3223 (ISSN-L)
DOI
10.1016/j.biopsych.2011.01.027
PMC
PMC3145207
OpenAlex
W2091646494
Cited by
493
References
139
Citations by year
2026: 40 · 2025: 40 · 2024: 33 · 2023: 30 · 2022: 14 · 2021: 24 · 2020: 26 · 2019: 32 · 2018: 30 · 2017: 34 · 2016: 36 · 2015: 49 · 2014: 36 · 2013: 26 · 2012: 33
FWCI
4.36
Type
journal article
Language
en
Open access
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations
  • Biological Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute on Alcohol Abuse and Alcoholism (RL1AA017536)
  • National Institute on Aging (R37AG006036, P01AG030004, R01AG006036, AG06036)
  • National Institute of Mental Health (P50MH068789)
  • National Center for Research Resources (U54RR024350)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Attention Deficit Hyperactivity Disorder
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
Keywords
attention deficit hyperactivity disorder, dorsolateral prefrontal cortex, catecholamines, norepinephrine, dopamine, alpha2A-adrenoceptor, dopamine D1 receptor, network connectivity, working memory, atomoxetine, guanfacine, stimulant medication, norepinephrine transporter, dopamine transporter
MeSH terms
Atomoxetine Hydrochloride, Adrenergic alpha-Agonists, Animals, Arousal, Attention Deficit Disorder with Hyperactivity, Catecholamines, Cognition, Humans, Memory, Short-Term, Methylphenidate, Models, Neurological, Neural Pathways, Synaptic Transmission, Propylamines, Guanfacine, Prefrontal Cortex, Adrenergic Uptake Inhibitors

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 by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-28.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-28.

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.

What counts as a claim ›How we measure confidence ›How we check this ›

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