Brain activity during emotionally negative pictures in schizophrenia with and without flat affect : an fMRI study

Details

Serval ID
serval:BIB_300B3F33D8D6
Type
Article: article from journal or magazin.
Collection
Publications
Title
Brain activity during emotionally negative pictures in schizophrenia with and without flat affect : an fMRI study
Journal
Psychiatry research
Author(s)
Fahim C., Stip E., Mancini-Marïe A., Mensour B., Boulay L.J., Leroux J.M., Beaudoin G., Bourgouin P., Beauregard M.
ISSN
0165-1781
Publication state
Published
Issued date
2005
Volume
140
Number
1
Pages
1-15
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't - Publication Status: ppublish
Abstract
The aim of this functional magnetic resonance imaging (fMRI) study was to compare regional brain activity in schizophrenia subjects with (FA+) and without (FA-) flat affect during the viewing of emotionally negative pictures. Thirteen FA+ subjects and 11 FA- subjects were scanned while being presented with a series of emotionally negative and neutral pictures. Experientially, the viewing of the negative pictures induced a negative emotional state whose intensity was significantly greater in the FA- group than in the FA+ group. Neurally, the Negative minus Neutral contrast revealed, in the FA- group, significant loci of activation in the midbrain, pons, anterior cingulate cortex, insula, ventrolateral orbitofrontal cortex, anterior temporal pole, amygdala, medial prefrontal cortex, and extrastriate visual cortex. In the FA+ group, this contrast produced significant loci of activation in the midbrain, pons, anterior temporal pole, and extrastriate visual cortex. When the brain activity measured in the FA+ group was subtracted from that measured in the FA- group, only the lingual gyrus was significantly activated. Perhaps in FA+ subjects an amygdaloid malfunction rendered the amygdala unable to correctly evaluate the emotional meaning of the pictures presented, thus preventing effective connectivity linking the amygdala to the brain regions implicated in the physiological and experiential dimensions of emotion. Alternatively, a disturbance of effective connectivity in the neural networks linking the midbrain and the medial prefrontal system may have been responsible for the quasi absence of emotional reaction in FA+ subjects, and the abnormal functioning of the medial prefrontal cortex and anterior cingulate cortex in the FA+ group.
Keywords
Adult, Affect, Amygdala / metabolism, Brain / anatomy & histology, Brain / metabolism, Female, Humans, Image Interpretation, Computer-Assisted, Magnetic Resonance Imaging, Male, Middle Aged, Photic Stimulation, Schizophrenia / metabolism, Schizophrenia / physiopathology
Pubmed
Create date
24/06/2009 14:39
Last modification date
20/08/2019 14:14
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