Emotion Processing in Schizophrenia: Insights From a Brain Imaging Study Comparing Patients, Siblings, and Healthy...

Area of Science:

• Neuroscience
• Psychiatry
• Brain Imaging

Background:

• Abnormal facial emotion recognition is a potential endophenotype for schizophrenia, affecting patients and their relatives.
• Previous functional magnetic resonance imaging (fMRI) studies have limitations, including the use of neutral stimuli and limited exploration of brain connectivity in relatives.
• Understanding neural correlates of emotion processing is crucial for schizophrenia endophenotype research.

Purpose of the Study:

• To investigate neural mechanisms of emotion processing in schizophrenia patients and their siblings.
• To focus on brain activation and functional connectivity during the perception of negatively valenced facial expressions.
• To address limitations of prior research by using ecologically valid tasks and examining connectivity patterns.

Main Methods:

• 118 participants (37 schizophrenia patients, 39 siblings, 42 healthy controls) underwent fMRI scanning.
• Participants performed an emotional task involving negatively valenced faces and control conditions.
• Behavioral performance was assessed using the Balanced Integration Score (BIS); fMRI data analyzed for activation and functional connectivity (gPPI) using the amygdala as seed regions.

Main Results:

• Both patients and siblings showed lower BIS scores compared to controls, indicating impaired behavioral performance.
• Siblings exhibited decreased brain responses to negative faces in the right superior temporal gyrus and right postcentral gyrus.
• Bayesian analyses suggested impaired activation in the right postcentral gyrus for patients; no significant group differences in amygdala activation were found. Siblings showed stronger right amygdala-right cuneus connectivity.

Conclusions:

• The amygdala response to negative faces appears similar across groups, but an endophenotypic pattern may exist in the right postcentral gyrus.
• Activation-based analyses may not fully capture neural abnormalities in emotion processing among schizophrenia relatives.
• Increased right amygdala-right cuneus connectivity in siblings might represent a compensatory mechanism.