Overcoming Rest-Task Divide-Abnormal Temporospatial Dynamics and Its Cognition in Schizophrenia

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Science

Background:

• Schizophrenia is a complex psychiatric disorder characterized by altered brain activity.
• The relationship between spontaneous (rest) and task-related brain activity, known as "state dependence," is not well understood in schizophrenia.

Purpose of the Study:

• To investigate the relationship between spontaneous and task-related brain activity in schizophrenia.
• To review electroencephalographic (EEG) and functional magnetic resonance imaging (fMRI) studies assessing rest/prestimulus-task modulation.

Main Methods:

• Systematic review of recent EEG and fMRI studies in schizophrenia.
• Comparison of brain activity during rest/prestimulus states versus task states.
• Analysis of rest/prestimulus-task modulation across different brain regions, measures, cognitive domains, and modalities.

Main Results:

• Studies consistently report reduced neural differentiation of task activity from rest activity in schizophrenia.
• This reduced modulation is observed across various brain regions, neural measures, cognitive domains, and imaging techniques.
• Findings indicate that abnormal temporospatial dynamics of spontaneous brain activity mediate this reduced modulation.

Conclusions:

• Reduced rest/prestimulus-task modulation is a key feature in schizophrenia.
• This phenomenon is linked to abnormal spontaneous brain activity dynamics and impaired predictive coding.
• It offers insights into the neural mechanisms underlying cognitive deficits and psychopathological symptoms in schizophrenia.