Dysfunctional gamma-band activity during face structural processing in schizophrenia patients

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Science

Background:

• Schizophrenia is a complex psychiatric disorder associated with cognitive deficits.
• Gamma-band activity (GBA) is crucial for sensory processing and cognitive functions, including face perception.
• Previous research suggests alterations in neural oscillations in schizophrenia, but face-specific GBA and synchronization patterns require further investigation.

Purpose of the Study:

• To investigate differences in gamma-band activity (GBA) and its phase synchrony during face perception between individuals with schizophrenia and healthy controls.
• To explore the relationship between GBA, phase synchrony, and clinical symptoms in schizophrenia patients.

Main Methods:

• Event-related potentials (ERPs) were recorded from 25 schizophrenia patients and 25 healthy controls viewing neutral faces.
• Spectral power and phase synchrony in the gamma frequency band (30-55 Hz) were analyzed at midline electrodes (FCz, Cz, CPz, Pz, POz).
• Statistical analyses, including repeated-measures ANOVA, were used to compare groups and identify correlations with clinical variables.

Main Results:

• Schizophrenia patients showed significantly lower GBA compared to controls.
• GBA was significantly reduced in schizophrenia patients around 700-800 ms at the FCz electrode.
• Phase synchronization in the gamma band was significantly lower in schizophrenia patients between 200-300 ms.
• Reduced frontal and central GBA correlated with hospitalization frequency and negative symptoms, respectively.

Conclusions:

• Schizophrenia patients exhibit impaired gamma-band activity and synchronization during face perception.
• These neural alterations are linked to negative symptoms and disease progression in schizophrenia.
• Findings suggest disrupted neural mechanisms underlying social cognition in schizophrenia.