Cited by 127Neurotransmitter Receptor Influence on BehaviorSubstance Abuse Treatment and OutcomesNeural and Behavioral Psychology Studies

Conditioned and sensitized responses to stimulant drugs in humans

Leyton, Marco·2007·Progress in Neuro-Psychopharmacology and Biological Psychiatry

Abstract

In animal models considerable evidence suggests that increased motivation to seek and ingest drugs of abuse are related to conditioned and sensitized activations of the mesolimbic dopamine (DA) system. Direct evidence for these phenomena in humans, though, is sparse. However, recent studies support the following. First, the acute administration of drugs of abuse across pharmacological classes increases extracellular DA levels within the human ventral striatum. Second, individual differences in the magnitude of this response correlate with rewarding effects of the drugs and the personality trait of novelty seeking. Third, transiently diminishing DA transmission in humans decreases drug craving, the propensity to preferentially respond to reward-paired stimuli, and the ability to sustain responding for future drug reward. Finally, very recent studies suggest that repeated exposure to stimulant drugs, either on the street or in the laboratory, can lead to conditioned and sensitized behavioral responses and DA release. In contrast to these findings, though, in individuals with a long history of substance abuse, drug-induced DA release is decreased. This diminished DA release could reflect two different phenomena. First, it is possible that drug withdrawal related decrements in DA cell function persist longer than previously suspected. Second, drug-paired stimuli may gain marked conditioned control over the release of DA and the expression of sensitization leading to reduced DA release when drug-related cues are absent. Based on these observations a two-factor hypothesis of the role of DA in drug abuse is proposed. In the presence of drug cues, conditioned and sensitized DA release would occur leading to focused drug-seeking behavior. In comparison, in the absence of drug-related stimuli DA function would be reduced, diminishing the ability of individuals to sustain goal-directed behavior and long-term objectives. This conditioned control of the expression of sensitized DA release could aggravate susceptibility to relapse, narrow the range of interests and perturb decision-making, accounting for a wide range of addiction related phenomena.

Integrity signals

Registry

Crossref · 10.1016/j.pnpbp.2007.08.027

Cites

200 of 200 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

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?

  • Experience-dependent mechanisms regulate the sensitivity and plasticity of the central nervous system and act at several biological levels: cellular changes such as neurogenesis, pruning and sprouting of synapses, myelination of axons and alterations to the number of dendritic spines; subcellular changes, such as alterations to the cytoskeleton and the extracellular matrix and changes in the level

    “These experience-dependent mechanisms regulate the sensitivity and plasticity of the central nervous system and act at several biological levels (likely partly in parallel with each other): i) cellular changes such as neurogenesis, pruning and sprouting of synapses, myelination of axons and alterations to the number of dendritic spines9, 10, ii) subcellular changes, such as alterations to the”
  • Drug dependence is closely linked to impulsivity, understood as preferring a smaller immediate reward over a larger delayed one.

    “Dependence to drugs of abuse is closely associated with impulsivity, or the propensity to choose a lower, but immediate, reward over a delayed, but more valuable outcome.”
  • The inverted U model proposes that optimal dopamine transmission, neither too low nor too high, is required for optimal response inhibition, and may explain discrepancies in healthy control studies.

    “One reason for this discrepancy may be explained by the “inverted U” model, which proposes that optimal dopamine transmission, which is neither too low nor too high, is required for optimal response inhibition (Cools and D'Esposito, 2011; Gjedde et al., 2010; Leyton, 2007).”
  • Sensitization of mesolimbic dopamine function results in the amplification of the neural mechanisms for incentive salience that transform ordinary levels of cue-triggered 'wanting' into excessive levels of urges to take drugs and gamble, and a persistent vulnerability to relapse.

    “Sensitization of mesolimbic dopamine function results in the amplification of the neural mechanisms for incentive salience that transform ordinary levels of cue-triggered ‘wanting’ into excessive levels of urges to take drugs and gamble, and a persistent vulnerability to relapse (Boileau et al., 2014; W. Y. Kim, Cho, Kwak, & Kim, 2017; Leyton, 2007).”
  • Gambling-related cues take on increased incentive salience, while other non-related or unfamiliar cues may become less important or even inhibit motivation.

    “This finding implies that while gambling-related cues take on increased incentive salience, other non-related or unfamiliar cues may become less important or even inhibit motivation (Leyton, 2007; 2014; Leyton & Vezina, 2012; 2014).”

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Leyton, M.
Affiliations
McGill University (CA)
Corresponding author
Leyton, Marco
Venue
Progress in Neuro-Psychopharmacology and Biological Psychiatry
Publisher
Elsevier BV
Published
2007-11
Volume
31
Issue
8
Pages
1601-1613
ISSN
0278-5846 (ISSN-L)
OpenAlex
W1991899916
Cited by
127
References
197
Citations by year
2026: 2 · 2025: 1 · 2023: 4 · 2022: 2 · 2021: 8 · 2020: 4 · 2019: 5 · 2018: 4 · 2017: 2 · 2016: 8 · 2015: 6 · 2014: 14 · 2013: 14 · 2012: 16
FWCI
0.82
Type
journal article
Language
en
Open access
closed
Locations
  • Progress in Neuro-Psychopharmacology and Biological Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
Funders
McGill University
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Health Sciences › Medicine › Epidemiology › Substance Abuse Treatment and Outcomes
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
Keywords
sensitization, mesolimbic dopamine system, dopamine release, ventral striatum, drug craving, novelty seeking, drug reward, relapse, drug withdrawal, stimulants, addiction, goal-directed behavior
MeSH terms
Central Nervous System Stimulants, Behavior, Conditioning, Psychological, Cues, Dopamine, Humans, 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.

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 ›

Are you an author, or do you see a problem with this page? Request a review