Abstract
Some of the most disabling aspects of mild traumatic brain injury (mTBI) include lingering deficits in executive functioning. It is known that mTBI can damage white matter tracts, but it remains unknown how this structural brain damage translates into cognitive deficits. This experiment utilized theta band phase synchrony to identify the dysfunctional neural operations that contribute to cognitive problems following mTBI. Sub-acute stage (< 2 weeks) mTBI patients (N = 52) and healthy matched controls (N = 32) completed a control-demanding task with concurrent EEG. Structural MRI was also collected. While there were no performance-specific behavioral differences between groups in the dot probe expectancy task, the degree of theta band phase synchrony immediately following injury predicted the degree of symptom recovery two months later. Although there were no differences in fractional anisotropy (FA) between groups, joint independent components analysis revealed that a smaller network of lower FA-valued voxels contributed to a diminished frontal theta phase synchrony network in the mTBI group. This finding suggests that frontal theta band markers of cognitive control are sensitive to sub-threshold structural aberrations following mTBI.
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Data availability
Data and code for this experiment are available on the PRED+CT website: www.predictsite.com; Accession #d010.
Notes
Although the NSI is sometimes reported with a three factor structure (Caplan et al. 2010), the somatic, cognitive, and affective dimensions were highly correlated here (r values from .78 to .84). Given that the somatic dimension has the most items (11 out of 22 items) and there are somatic features in the other dimensions (headache, fatigue), in this sample these sub-scales appear to reflect common variance in a somatic-dominant dimension.
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Acknowledgements
The authors thank Jacqueline Hope Story-Remer, Violet Fratzke, Davin Quinn, Rick Campbell, Ron Yeo, and Jacki Janowich for help with this project and Vince Calhoun for helpful discussions of jICA. This research was supported by an Institutional Development Award (IDeA) from the National Institute of General Medical Sciences of the National Institutes of Health under grant number P20GM109089.
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This study was funded by an Institutional Development Award (IDeA) from the National Institute of General Medical Sciences of the National Institutes of Health under grant number P20GM109089.
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Cavanagh, J.F., Rieger, R.E., Wilson, J.K. et al. Joint analysis of frontal theta synchrony and white matter following mild traumatic brain injury. Brain Imaging and Behavior 14, 2210–2223 (2020). https://doi.org/10.1007/s11682-019-00171-y
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DOI: https://doi.org/10.1007/s11682-019-00171-y