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Default-mode network dysfunction and self-referential processing in healthy siblings of schizophrenia patients
Mariët van Buuren1, Matthijs Vink, René S Kahn
1Rudolf Magnus Institute of Neuroscience, Department of Psychiatry, University Medical Center Utrecht, Room A.01.126, P.O. Box 85500, 3508 GA Utrecht, The Netherlands. vanbuurenmariet@gmail.com
Schizophrenia Research
|October 27, 2012
Summary
Unaffected siblings of schizophrenia patients show abnormal resting-state connectivity in the default-mode network (DMN). This altered brain connectivity is linked to difficulties in self-referential processing, suggesting a potential risk marker for schizophrenia.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Science
Background:
- The default-mode network (DMN) is crucial for self-referential processing and social cognition.
- Schizophrenia patients exhibit abnormal DMN connectivity, impacting introspection.
- Individuals at genetic risk, like siblings of patients, may show similar brain alterations.
Purpose of the Study:
- To investigate resting-state DMN connectivity in unaffected siblings of schizophrenia patients.
- To determine if DMN connectivity in siblings relates to self-referential processing.
- To identify potential neural markers of schizophrenia risk.
Main Methods:
- Functional MRI (fMRI) was used to measure brain activity.
- 25 unaffected siblings and 25 healthy controls participated.
- Scans included resting-state and a self-referential adjective task.
Main Results:
- Siblings displayed exaggerated resting-state connectivity within the DMN's midline regions.
- Siblings showed impaired modulation of DMN connectivity during self-referential tasks.
- No differences in DMN activation levels were found between groups.
Conclusions:
- Increased genetic risk for schizophrenia is associated with abnormal intrinsic DMN connectivity.
- Aberrant DMN interactions during self-referential processing may be a risk indicator.
- These findings highlight the DMN's role in schizophrenia vulnerability.
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