Altered insular function during aberrant salience processing in relation to the severity of psychotic symptoms

Frontiers in Psychiatry

Claudia Lenz¹  Renata Smieskova¹  Undine E. Lang¹  Tobias Vogel¹  André Schmidt¹  Fabienne Harrisberger¹  Claudia Suenderhauf¹  Anita Riecher-Rössler¹  Anne Eckert¹  Anna Walter¹  Stefan Borgwardt¹ 

[1] University of Basel;

关键词: Psychopathology;    Schizophrenia;    fMRI;    MRI;    psychosis;    first episode psychosis;   

DOI  :  10.3389/fpsyt.2016.00189

来源: DOAJ

【 摘 要 】

There is strong evidence for abnormal salience processing in patients with psychotic experiences. In particular, there are indications that the degree of aberrant salience processing increases with the severity of positive symptoms. The aim of the present study was to elucidate this relationship by means of brain imaging.Functional magnetic resonance imaging was acquired to assess haemodynamic responses during the Salience Attribution Test, a paradigm for reaction time that measures aberrant salience to irrelevant stimulus features. We included 42 patients who were diagnosed as having a psychotic disorder and divided them into two groups according to the severity of their positive symptoms. Whole brain analysis was performed using Statistical Parametric Mapping.We found no significant behavioural differences with respect to task performance. Patients with more positive symptoms showed increased haemodynamic responses in the left insula corresponding to aberrant salience than in patients with less positive symptoms. In addition, left insula activation correlated negatively with cumulative antipsychotic medication. Aberrant salience processing in the insula may be increased in psychosis, depending on the severity of positive symptoms. This study indicates that clinically similar psychosis manifestations share the same functional characteristics. In addition, our results suggest that antipsychotic medication can modulate insular function.

【 授权许可】

Unknown