Dynamic Functional Connectivity Patterns in Schizophrenia and the Relationship With Hallucinations.

Area of Science:

• Neuroscience
• Psychiatry
• Brain Imaging

Background:

• Schizophrenia is characterized by aberrant functional connectivity (FC), but findings vary.
• Dynamic FC analysis offers deeper insights into temporal connectivity changes than static FC.
• Default Mode Network (DMN) dysfunction is implicated in schizophrenia.

Purpose of the Study:

• To investigate dynamic FC in schizophrenia patients compared to healthy controls.
• To explore the relationship between dynamic FC and hallucinations, a core schizophrenia symptom.
• To determine if hallucination proneness or current severity is associated with dynamic FC patterns.

Main Methods:

• Studied 80 schizophrenia patients and 80 matched healthy controls.
• Utilized dynamic functional connectivity (dFC) analysis to examine temporal brain network changes.
• Assessed hallucinations using both current severity and a 1-year trait measure of hallucination proneness.

Main Results:

• Replicated previous findings of aberrant dwell times in specific FC states, supporting DMN dysfunction.
• Current hallucination severity showed no significant relationship with dynamic FC.
• Higher hallucination proneness over 1 year correlated with less time in states showing DMN-task-positive anti-correlation.

Conclusions:

• Findings support theories linking DMN instability and impaired cognitive control to hallucinations in schizophrenia.
• Dynamic FC abnormalities, particularly related to DMN and task-positive network interactions, are associated with hallucination proneness.
• Hallucination proneness may serve as a biomarker for distinct schizophrenia patient subgroups.