Cited by 229Schizophrenia research and treatmentPsychedelics and Drug StudiesNeurotransmitter Receptor Influence on Behavior

The DOI matches its Crossref record; 296 of the 300 references it cites were found in a registry or an index.

Glutamatergic Model Psychoses: Prediction Error, Learning, and Inference

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Abstract

Modulating glutamatergic neurotransmission induces alterations in conscious experience that mimic the symptoms of early psychotic illness. We review studies that use intravenous administration of ketamine, focusing on interindividual variability in the profundity of the ketamine experience. We will consider this individual variability within a hypothetical model of brain and cognitive function centered upon learning and inference. Within this model, the brains, neural systems, and even single neurons specify expectations about their inputs and responding to violations of those expectations with new learning that renders future inputs more predictable. We argue that ketamine temporarily deranges this ability by perturbing both the ways in which prior expectations are specified and the ways in which expectancy violations are signaled. We suggest that the former effect is predominantly mediated by NMDA blockade and the latter by augmented and inappropriate feedforward glutamatergic signaling. We suggest that the observed interindividual variability emerges from individual differences in neural circuits that normally underpin the learning and inference processes described. The exact source for that variability is uncertain, although it is likely to arise not only from genetic variation but also from subjects' previous experiences and prior learning. Furthermore, we argue that chronic, unlike acute, NMDA blockade alters the specification of expectancies more profoundly and permanently. Scrutinizing individual differences in the effects of acute and chronic ketamine administration in the context of the Bayesian brain model may generate new insights about the symptoms of psychosis; their underlying cognitive processes and neurocircuitry.

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Metadata

Authors
Corlett, P. R., Honey, G. D., Krystal, J. H., & Fletcher, P. C.
Affiliations
  • Yale University (US)
  • Pfizer (United States) (US)
  • University of Cambridge (GB)
Corresponding author
Corlett, Philip R
Venue
Neuropsychopharmacology
Published
2010-09-22
Volume
36
Issue
1
Pages
294-315
ISSN
  • 0893-133X (ISSN-L)
  • 1740-634X
OpenAlex
W2094348922
Cited by
229
References
300
Citations by year
2026: 3 · 2025: 7 · 2024: 14 · 2023: 10 · 2022: 9 · 2021: 19 · 2020: 13 · 2019: 9 · 2018: 12 · 2017: 21 · 2016: 20 · 2015: 29 · 2014: 19 · 2013: 18 · 2012: 17
FWCI
1.97
Type
journal article
Language
en
Open access
Locations
  • Neuropsychopharmacology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Wellcome Trust (064351)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
  • Social Sciences › Psychology › Clinical Psychology › Psychedelics and Drug Studies
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
ketamine, psychosis, glutamatergic neurotransmission, NMDA receptor blockade, prediction error, interindividual variability, subjective experience, expectancy violation, individual differences
MeSH terms
Animals, Bayes Theorem, Cognition, Humans, Learning, Models, Neurological, Psychoses, Substance-Induced, Psychotic Disorders, Receptors, Glutamate, Excitatory Amino Acid Antagonists, Glutamic Acid

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