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Longitudinal alterations in motivational salience processing in ultra high-risk subjects for psychosis

Research output: Contribution to journalArticle

Original languageEnglish
Article numberPSM-D-16-00500R2
Pages (from-to)243-254
JournalPsychological Medicine
Early online date4 Oct 2016
DOIs
Accepted/In press23 Aug 2016
E-pub ahead of print4 Oct 2016
PublishedJan 2017

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King's Authors

Abstract

Background: Impairments in the attribution of salience are thought to be fundamental to the development of psychotic symptoms and the onset of psychotic disorders. The aim of the present study was to explore longitudinal alterations in salience processing in ultra high-risk subjects for psychosis.

Methods: 23 ultra high-risk subjects and 13 healthy controls underwent functional magnetic resonance imaging at two time points (mean interval of 17 months) while performing the Salience Attribution Test to assess neural responses to task-relevant (adaptive salience) and task-irrelevant (aberrant salience) stimulus features.

Results: At presentation, high-risk subjects were less likely than controls to attribute salience to relevant features, and more likely to attribute salience to irrelevant stimulus features. These behavioural differences were no longer evident at follow-up. When attributing salience to relevant cue features, ultra high-risk subjects showed less activation than controls in the ventral striatum at both baseline and follow-up. Within the high-risk sample, amelioration of abnormal beliefs over the follow-up period was correlated with an increase in right ventral striatum activation during the attribution of salience to relevant cue features.

Conclusions: These findings confirm that salience processing is perturbed in ultra high-risk subjects for psychosis, that this is linked to alterations in ventral striatum function, and that clinical outcomes are related to longitudinal changes in ventral striatum function during salience processing.

Declaration of interest: None.

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