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PLoS One. 2014 Jun 30;9(6):e101372. doi: 10.1371/journal.pone.0101372. eCollection 2014.

Cortical thinning in temporo-parietal junction (TPJ) in non-affective first-episode of psychosis patients with persistent negative symptoms.

Author information

1
Prevention and Early Intervention Program for Psychoses (PEPP - Montreal), Douglas Mental Health University Institute, Montreal, Canada; Department of Psychology, McGill University, Montreal, Canada.
2
Department of Neurology & Neurosurgery, McGill University, Montreal, Canada.
3
Prevention and Early Intervention Program for Psychoses (PEPP - Montreal), Douglas Mental Health University Institute, Montreal, Canada; Department of Psychiatry, McGill University, Montreal, Canada.
4
Prevention and Early Intervention Program for Psychoses (PEPP - Montreal), Douglas Mental Health University Institute, Montreal, Canada; Department of Psychology, McGill University, Montreal, Canada; Department of Neurology & Neurosurgery, McGill University, Montreal, Canada; Department of Psychiatry, McGill University, Montreal, Canada.

Abstract

BACKGROUND:

Negative symptoms represent an unmet therapeutic need in many patients with schizophrenia. In an extension to our previous voxel-based morphometry findings, we employed a more specific, vertex-based approach to explore cortical thinning in relation to persistent negative symptoms (PNS) in non-affective first-episode of psychosis (FEP) patients to advance our understanding of the pathophysiology of primary negative symptoms.

METHODS:

This study included 62 non-affective FEP patients and 60 non-clinical controls; 16 patients were identified with PNS (i.e., at least 1 primary negative symptom at moderate or greater severity sustained for at least 6 consecutive months). Using cortical thickness analyses, we explored for differences between PNS and non-PNS patients as well as between each patient group and healthy controls; cut-off threshold was set at p<0.01, corrected for multiple comparisons.

RESULTS:

A thinner cortex prominently in the right superior temporal gyrus extending into the temporo-parietal junction (TPJ), right parahippocampal gyrus, and left orbital frontal gyrus was identified in PNS patients vs. non-PNS patients. Compared with healthy controls, PNS patients showed a thinner cortex prominently in the right superior temporal gyrus, right parahippocampal gyrus, and right cingulate; non-PNS patients showed a thinner cortex prominently in the parahippocampal gyrus bi-laterally.

CONCLUSION:

Cortical thinning in the early stages of non-affective psychosis is present in the frontal and temporo-parietal regions in patients with PNS. With these brain regions strongly related to social cognitive functioning, our finding suggests a potential link between primary negative symptoms and social cognitive deficits through common brain etiologies.

PMID:
24979583
PMCID:
PMC4076331
DOI:
10.1371/journal.pone.0101372
[Indexed for MEDLINE]
Free PMC Article
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