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Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury
Published on: November 19, 2012
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Altered segregation between task-positive and task-negative regions in mild traumatic brain injury
Chandler Sours1, Joshua Kinnison2, Srikanth Padmala2
1Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, 22 South Greene Street, Baltimore, MD, 21201, USA. csour001@umaryland.edu.
Brain Imaging and Behavior
|May 1, 2017
Summary
Mild traumatic brain injury (mTBI) patients show altered brain network communication during demanding cognitive tasks. Chronic mTBI impacts both within and between brain networks, suggesting persistent neural changes.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Neuroimaging
Background:
- Mild traumatic brain injury (mTBI) can cause diffuse brain damage.
- Understanding chronic effects on brain networks is crucial for recovery assessment.
Purpose of the Study:
- Investigate alterations in large-scale brain networks in chronic mTBI patients.
- Examine network communication during working memory tasks at varying cognitive loads.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used in 30 mTBI patients and 28 controls.
- The N-back task (1-back and 2-back) assessed working memory.
- Graph theory measures, specifically modularity, quantified network segregation.
Main Results:
- mTBI patients exhibited reduced segregation between task-positive and Default Mode Networks (DMN).
- Increased functional connectivity within DMN regions was observed in mTBI patients during the 2-back task.
- These network alterations persisted in the chronic stage of injury.
Conclusions:
- mTBI leads to persistent alterations in neural communication within and between brain networks.
- Cognitive demand exacerbates these network differences.
- Longitudinal studies are needed to track neural recovery post-mTBI.
