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Aberrant Salience, Information Processing, and Dopaminergic Signaling in People at Clinical High Risk for Psychosis.

Abstract：

:The aberrant salience hypothesis proposes that striatal dopamine dysregulation causes misattribution of salience to irrelevant stimuli leading to psychosis. Recently, new lines of preclinical evidence on information coding by subcortical dopamine coupled with computational models of the brain's ability to predict and make inferences about the world (predictive processing) provide a new perspective on this hypothesis. We review these and summarize the evidence for dopamine dysfunction, reward processing, and salience abnormalities in people at clinical high risk of psychosis (CHR) relative to findings in patients with psychosis. This review identifies consistent evidence for dysregulated subcortical dopamine function in people at CHR, but also indicates a number of areas where neurobiological processes are different in CHR subjects relative to patients with psychosis, particularly in reward processing. We then consider how predictive processing models may explain psychotic symptoms in terms of alterations in prediction error and precision signaling using Bayesian approaches. We also review the potential role of environmental risk factors, particularly early adverse life experiences, in influencing the prior expectations that individuals have about their world in terms of computational models of the progression from being at CHR to frank psychosis. We identify a number of key outstanding questions, including the relative roles of prediction error or precision signaling in the development of symptoms and the mechanism underlying dopamine dysfunction. Finally, we discuss how the integration of computational psychiatry with biological investigation may inform the treatment for people at CHR of psychosis.

journal_name

Biol Psychiatry

journal_title

Biological psychiatry

authors

Howes OD,Hird EJ,Adams RA,Corlett PR,McGuire P

doi

10.1016/j.biopsych.2020.03.012

subject

Has Abstract

pub_date

2020-08-15 00:00:00

pages

304-314

issue

4

eissn

0006-3223

issn

1873-2402

pii

S0006-3223(20)31383-4

journal_volume

88

pub_type

杂志文章,评审

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