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Online Transcranial Magnetic Stimulation Protocol for Measuring Cortical Physiology Associated with Response Inhibition
Published on: February 8, 2018
Investigating inhibition deficit in schizophrenia using task-modulated brain networks
Hang Yang1, Xin Di1,2, Qiyong Gong3
1The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Lab for Neuroinformation, Center for Information in Medicine, High-Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China.
Schizophrenia patients exhibit altered brain network connectivity during response inhibition tasks. Task-modulated connectivity (TMC) differences were observed, impacting behavioral predictions and diagnostic classification.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Science
Background:
- Individuals with schizophrenia display impaired response inhibition, evidenced by longer stop signal response times (SSRT) and reduced right inferior frontal gyrus activation.
- The specific alterations in distributed brain networks supporting response inhibition in schizophrenia remain largely unexplored.
Purpose of the Study:
- To investigate how distributed brain networks support response inhibition and identify network alterations in schizophrenia.
- To compare the efficacy of different functional connectivity measures (TMC, TIC, TFC, RSFC) in classifying schizophrenia and predicting behavioral performance.
Main Methods:
- Functional MRI data from 44 schizophrenia patients and 44 controls during a stop signal task were analyzed.
- Whole-brain psychophysiological interaction analysis was used to compute task-modulated connectivity (TMC).
- Support vector classification and regression were employed for group classification and behavioral prediction.
Main Results:
- Schizophrenia patients showed decreased TMC in fronto-parietal networks and increased TMC in sensorimotor networks.
- TMC successfully predicted SSRT in controls but not in schizophrenia patients, indicating abnormal task modulation.
- Task-independent connectivity (TIC) outperformed other measures in classifying schizophrenia, while TMC was superior for behavioral prediction.
Conclusions:
- Schizophrenia is associated with altered functional integration within brain networks critical for response inhibition.
- Different connectivity measures offer complementary insights into brain network function and dysfunction in schizophrenia.
- These findings advance the understanding of the neural underpinnings of response inhibition deficits in schizophrenia.
