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Developing Neuroimaging Phenotypes of the Default Mode Network in PTSD: Integrating the Resting State, Working Memory, and Structural Connectivity

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Never resting region--mPFC in schizophrenia.

Maya Bleich-Cohen¹, Marina Kupchik, Michal Gruberger

¹Functional Brain Imaging Unit, Wohl Institute for Advanced Imaging, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel. maya44@gmail.com

Schizophrenia Research

|July 24, 2012

Summary

Schizophrenia patients show altered brain connectivity between the inferior frontal gyrus (IFG) and medial prefrontal cortex (mPFC) during language tasks. This heightened connectivity correlates with reduced white matter integrity, suggesting impaired information processing in schizophrenia.

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Area of Science:

Neuroscience
Psychiatry
Cognitive Science

Background:

Reduced functional connectivity (FC) is observed in schizophrenia, but its role between different brain networks remains unclear.
The interaction between task-related and default mode networks is crucial for cognitive function.

Purpose of the Study:

To investigate the functional connectivity (FC) between the inferior frontal gyrus (IFG) and medial prefrontal cortex (mPFC) during a language task in schizophrenia.
To explore the association between this FC and the structural integrity of the corpus callosum.

Main Methods:

Functional magnetic resonance imaging (fMRI) to measure brain activity and FC.
Diffusion tensor imaging (DTI) to assess white matter organization of the corpus callosum.
Language task performance analysis.

Main Results:

Schizophrenia patients exhibited increased mPFC-IFG FC during the language task compared to controls.
This heightened FC in patients was associated with decreased white matter integrity in the corpus callosum.
Altered connectivity patterns were specific to the schizophrenia group during task engagement.

Conclusions:

The findings suggest that aberrant functional connectivity between IFG and mPFC during cognitive tasks may underlie cognitive deficits in schizophrenia.
Impaired suppression of internally generated information due to altered network interactions could contribute to psychopathology.
The study highlights the importance of inter-network connectivity in understanding schizophrenia pathophysiology.