Cited by 351Neural and Behavioral Psychology StudiesNeurotransmitter Receptor Influence on BehaviorNeuroscience and Neuropharmacology Research

Cognitive Inflexibility after Prefrontal Serotonin Depletion Is Behaviorally and Neurochemically Specific

Clarke, H., Walker, S., Dalley, J., Robbins, T., Roberts, A.·2006·Cerebral Cortex

Abstract

We have previously demonstrated that prefrontal serotonin depletion impairs orbitofrontal cortex (OFC)-mediated serial discrimination reversal (SDR) learning but not lateral prefrontal cortex (PFC)-mediated attentional set shifting. To address the neurochemical specificity of this reversal deficit, Experiment 1 compared the effects of selective serotonin and selective dopamine depletions of the OFC on performance of the SDR task. Whereas serotonin depletions markedly impaired performance, OFC dopamine depletions were without effect. The behavioral specificity of this reversal impairment was investigated in Experiment 2 by examining the effect of OFC serotonin depletion on performance of a modified SDR task designed to distinguish between 3 possible causes of the impairment. The results showed that the reversal deficit induced by prefrontal serotonin depletion was not due to a failure to approach a previously unrewarded stimulus (enhanced learned avoidance) or reduced proactive interference. Instead, it was due specifically to a failure to inhibit responding to the previously rewarded stimulus. The neurochemical and behavioral specificity of this particular form of cognitive inflexibility is of particular relevance to our understanding of the aetiology and treatment of inflexible behavior apparent in many neuropsychiatric and neurodegenerative disorders involving the PFC.

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Crossref · 10.1093/cercor/bhj120

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  • In marmoset monkeys, targeted neurotoxic serotonin depletion of the orbito-frontal cortex, but not of the caudate nucleus, consistently produced reversal deficits.

    “In marmoset monkeys, targeted neurotoxic serotonin depletion of the orbito-frontal cortex, but not of the caudate nucleus, consistently produced reversal deficits [5, 6].”

    From Chronic escitalopram in healthy volunteers has specific effects on reinforcement sensitivity: a double-blind, placebo-controlled semi-randomised study (2023) · cites this paper as [6]

    The Discussion reports reversal-learning deficits after serotonin depletion in marmoset OFC and lateral PFC, and the Serial reversal section reports more errors across reversals. The paper does not report a comparison with targeted serotonin depletion of the caudate nucleus; its comparison is with dopamine depletion of the OFC. It also notes that serotonin depletion was not restricted to the OFC. (LLM, conf=0.89)

    Experimental — accuracy not yet measured
  • Serotonin is released in the PFC during exposure to uncontrollable stress and is key to orbital PFC function.

    “For example, important work is underway to reveal the complex and powerful effects on prefrontal functions of serotonin, another modulator that is released in the PFC during exposure to uncontrollable stress158 and that is key to orbital PFC function159.”
  • Work in animals has shown decreased sensitivity to outcome devaluation as a result of serotonin receptor antagonism or serotonin depletion.

    “but work in animals has shown decreased sensitivity to outcome devaluation as a result of serotonin receptor antagonism or serotonin depletion 34, 35.”

    From Enhanced avoidance habits in obsessive-compulsive disorder (2014) · cites this paper as [34]

  • Depletion of dopamine in the striatum, but not the OFC, caused reversal learning deficits in marmosets.

    “Depletion of dopamine in this brain region, but not in the OFC, caused deficits in marmosets (Clarke et al 2011, Clarke et al 2007)”

    From Prefrontal cortex executive processes affected by stress in health and disease (2018) · cites this paper as Clarke et al 2007

  • The authors' results and framework, including how learning from worse-than-expected outcomes is affected, agree with earlier observations and manipulations of serotonin neurons.

    “Our findings and conceptual framework, including the effect on learning from worse-than-expected outcomes, are consistent with previous observations and manipulations of serotonin neuron activity.”

    From Serotonin neurons modulate learning rate through uncertainty (2022) · cites this paper as [38]

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Authors
Clarke, H., Walker, S., Dalley, J., Robbins, T., & Roberts, A.
Affiliations
University of Cambridge (GB)
Venue
Cerebral Cortex
Published
2006-02-01
Volume
17
Issue
1
Pages
18-27
ISSN
  • 1047-3211 (ISSN-L)
  • 1460-2199
OpenAlex
W2121245502
Cited by
351
References
56
Citations by year
2026: 2 · 2025: 8 · 2024: 11 · 2023: 8 · 2022: 18 · 2021: 16 · 2020: 19 · 2019: 16 · 2018: 14 · 2017: 16 · 2016: 16 · 2015: 23 · 2014: 20 · 2013: 30 · 2012: 15
FWCI
10.53
Type
journal article
Language
en
Open access
closed
Locations
  • Cerebral Cortex (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Wellcome Trust
  • University of Cambridge
  • Medical Research Council
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
cognitive inflexibility, orbitofrontal cortex, set-shifting, selective serotonin reuptake inhibitors, response inhibition, proactive interference, prefrontal cortex, neuropsychiatric disorders
MeSH terms
Animals, Avoidance Learning, Behavior, Animal, Brain Chemistry, Callithrix, Cognition, Color, Discrimination Learning, Dopamine, Female, Hydroxydopamines, Hydroxyindoleacetic Acid, Male, Norepinephrine, Photic Stimulation, Psychomotor Performance, Reversal Learning, Reward, Serial Learning, Serotonin, 5,7-Dihydroxytryptamine, Prefrontal Cortex, Serotonin Agents

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