Intrinsic, task-evoked and absolute gamma synchrony during cognitive processing in first onset schizophrenia

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Science

Background:

• Cognitive deficits in schizophrenia are linked to neural synchrony issues.
• Gamma synchrony's role in higher-order cognition in early schizophrenia is understudied.

Purpose of the Study:

• To investigate gamma synchrony profiles and cognitive performance in first onset schizophrenia (FOS).
• To compare intrinsic, task-evoked, and absolute gamma synchrony between FOS patients and controls.
• To assess the relationship between gamma synchrony, cognitive performance, symptoms, and functioning.

Main Methods:

• Electroencephalography (EEG) recorded gamma synchrony during a Continuous Performance Test (CPT).
• Synchrony analyzed in fronto-parietal attention and visual networks for 59 FOS patients and 59 controls.
• Group comparisons and correlational analyses performed for synchrony measures, CPT accuracy, symptoms, and functioning.

Main Results:

• FOS patients showed reduced task-evoked gamma synchrony modulation.
• FOS patients had higher intrinsic and absolute gamma synchrony, especially frontally.
• Gamma synchrony abnormalities correlated with CPT performance but not with symptoms or functioning.

Conclusions:

• First onset schizophrenia is characterized by abnormal gamma synchrony, specifically impaired task-related modulation.
• Excessive intrinsic gamma synchrony may constrain task-relevant neural communication, impacting cognition.
• These findings support gamma synchrony dysfunction as a core neural mechanism underlying cognitive deficits in schizophrenia.