Evidence map›Paper›PMID 33581835›Full record

ArticleBiological psychiatry2021

Reduced Glutamate Turnover in the Putamen Is Linked With Automatic Habits in Human Cocaine Addiction.

Karen D Ersche, Tsen Vei Lim, Alexander G Murley, Catarina Rua, Matilde M Vaghi, Tara L White, Guy B Williams, Trevor W Robbins

Open access · hybridAbstract read
In one paragraph

Article in Biological psychiatry, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 31 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
31citing papers in PubMed, 2 pooled it
4.1field-weighted citation impact, top 5% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

31 citing papers in PubMed, 2 syntheses or guidelines pooled it, 64 citations in OpenAlex.

  1. Pooled it
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  10. Goal-direction and habit in human and nonhuman behavioral sequences (behavior chains).Journal of experimental psychology. Animal learning and cognition · 2025
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  18. Characterizing Human Habits in the Lab.Collabra. Psychology · 2024
    Article
  19. Frontiers in psychiatry · 2024
    Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors at 2 institutions in 2 countries.

Karen D ErscheDepartments of Psychiatry, Psychology, and Clinical Neurosciences, University of Cambridge, Cambridge, United Kingdom. Electronic address: ke220@cam.ac.uk.
Tsen Vei LimDepartments of Psychiatry, Psychology, and Clinical Neurosciences, University of Cambridge, Cambridge, United Kingdom.
Alexander G MurleyDepartments of Psychiatry, Psychology, and Clinical Neurosciences, University of Cambridge, Cambridge, United Kingdom.
Catarina RuaWolfson Brain Imaging Centre, University of Cambridge, Cambridge, United Kingdom.
Matilde M VaghiDepartments of Psychiatry, Psychology, and Clinical Neurosciences, University of Cambridge, Cambridge, United Kingdom; Department of Psychology, Stanford University, Stanford, California.
Tara L WhiteDepartment of Behavioral and Social Sciences, Brown University, Providence, Rhode Island.
Guy B WilliamsDepartments of Psychiatry, Psychology, and Clinical Neurosciences, University of Cambridge, Cambridge, United Kingdom; Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, United Kingdom.
Trevor W RobbinsDepartments of Psychiatry, Psychology, and Clinical Neurosciences, University of Cambridge, Cambridge, United Kingdom.
University of Cambridge · GBBrown University · US

Funding

Department of HealthMedical Research Council G0701497Medical Research Council MR/M008983/1Medical Research Council MR/M009041/1Wellcome TrustWellcome Trust 104631/Z/14/ZWellcome Trust 105602/Z/14/Z
6 · The paper itself

Abstract

backgroundThe balance between goal-directed behavior and habits has been hypothesized to be biased toward the latter in individuals with cocaine use disorder (CUD), suggesting possible neurochemical changes in the putamen, which may contribute to their compulsive behavior.

methodsWe assessed habitual behavior in 48 patients with CUD and 42 healthy control participants using a contingency degradation paradigm and the Creature of Habit Scale. In a subgroup of this sample (CUD: n = 21; control participants: n = 22), we also measured glutamate and glutamine concentrations in the left putamen using ultra-high-field (7T) magnetic resonance spectroscopy. We hypothesized that increased habitual tendencies in patients with CUD would be associated with abnormal glutamatergic metabolites in the putamen.

resultsCompared with their non-drug-using peers, patients with CUD exhibited greater habitual tendencies during contingency degradation, which correlated with increased levels of self-reported daily habits. We further identified a significant reduction in glutamate concentration and glutamate turnover (glutamate-to-glutamine ratio) in the putamen in patients with CUD, which was significantly related to the level of self-reported daily habits.

conclusionsPatients with CUD exhibit enhanced habitual behavior, as assessed both by questionnaire and by a laboratory paradigm of contingency degradation. This automatic habitual tendency is related to a reduced glutamate turnover in the putamen, suggesting a dysregulation of habits caused by chronic cocaine use.

Indexed as

CocaineCocaine-Related DisordersGlutamic AcidHabitsHumansMagnetic Resonance ImagingPutamenCocaineGlutamic Acid7T magnetic resonance spectroscopyCocaine use disorderContingency degradationCreature of Habit ScaleGlutamate-to-glutamine ratio

Identifiers

PMID33581835
PMCPMC8083107
OpenAlexW3113159243

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.