Abstract
This study investigates cognitive deficits and alterations in resting state functional connectivity in civilian mild traumatic brain injury (mTBI) participants with high and low symptoms. Forty-one mTBI participants completed a resting state fMRI scan and the Automated Neuropsychological Assessment Metrics (ANAM) during initial testing (<10 days of injury) and a 1 month follow up. Data were compared to 30 healthy control subjects. Results from the ANAM demonstrate that mTBI participants performed significantly worse than controls on the code substitution delayed subtest (p = 0.032) and weighted throughput score (p = 0.001). Among the mTBI patients, high symptom mTBI participants performed worse than those with low symptoms on the code substitution delayed (p = 0.017), code substitution (p = 0.012), repeated simple reaction time (p = 0.031), and weighted throughput score (p = 0.009). Imaging results reveal that during the initial visit, low symptom mTBI participants had reduced interhemispheric functional connectivity (IH-FC) within the lateral parietal lobe (p = 0.020); however, during follow up, high symptom mTBI participants showed reduced IH-FC compared to the control group within the dorsolateral prefrontal cortex (DLPFC) (p = 0.013). Reduced IH-FC within the DLPFC during the follow-up was associated with reduced cognitive performance. Together, these findings suggest that reduced rs-FC may contribute to the subtle cognitive deficits noted in high symptom mTBI participants compared to control subjects and low symptom mTBI participants.
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Abbreviations
- ANAM:
-
Automated Neuropsychological Assessment Metrics
- DAI:
-
Diffuse axonal injury
- DLPFC:
-
Dorsolateral prefrontal cortex
- DMN:
-
Default Mode Network
- DRS:
-
Disability Rating Scale
- IH-FC:
-
Interhemspheric functional connectivity
- GOSE:
-
Glasgow Outcome Scale Extended
- MACE:
-
Military Initial Concussion Evaluation
- MMSE:
-
Mini Mental Status Exam
- mTBI:
-
Mild traumatic brain injury
- PCS:
-
Post concussive syndrome
- RPQ:
-
Rivermead Post Concussion Symptoms Questionnairre
- rs-FC:
-
Resting state functional connectivity
- rs-fMRI:
-
Resting state functional MRI
- TPN:
-
Task Positive Network
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Acknowledgements
The authors would like to thank Joshua Betz, Jacqueline Janowich and Teodora Stoica for their help with participant recruitment and George Makris for his help with acquiring and processing the data. This study was supported by DOD award W81XWH-08-1-0725 and W81XWH- 12-1-0098. Chandler Sours was partly supported by an NRSA Grant from the National Institute of Neurological Disorders and Stroke (1F31NS081984).
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Supplemental Figure 1
Comparison of mean motion parameters for the three groups. Bar graphs of the mean of the 6 motion parameters for the three groups (control, low symptom mTBI, high symptom mTBI) for (A) the initial visit and (B) the 1 month follow up. Significance assessed using separate One-Way ANOVA between groups at each time point to assess group differences between the three groups. * p <0.05. (JPEG 34 kb)
Supplemental Figure 2
Scatter plot of the mean translation in the y direction versus IH-FC within the dorsolateral prefrontal cortex (DLPFC), thalamus, lateral parietal lobe, and medial temporal lobe (MTL). Data is shown for all rs-fMRI scans (control at one visit and high symptom mTBI and low symptom mTBI at the initial and 1 month follow up). Significance assessed Pearson’s bivariate correlations. (JPEG 39 kb)
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Sours, C., Rosenberg, J., Kane, R. et al. Associations between interhemispheric functional connectivity and the Automated Neuropsychological Assessment Metrics (ANAM) in civilian mild TBI. Brain Imaging and Behavior 9, 190–203 (2015). https://doi.org/10.1007/s11682-014-9295-y
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DOI: https://doi.org/10.1007/s11682-014-9295-y