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Neuroimage Clin. 2016 Jan 6;11:10-9. doi: 10.1016/j.nicl.2016.01.004. eCollection 2016.

Exploring the physiological correlates of chronic mild traumatic brain injury symptoms.

Author information

1
Department of Neurology, Washington University in St. Louis, 660 S. Euclid Ave, Campus Box 8225, St. Louis, MO 63110, USA.

Abstract

We report on the results of a multimodal imaging study involving behavioral assessments, evoked and resting-state BOLD fMRI, and DTI in chronic mTBI subjects. We found that larger task-evoked BOLD activity in the MT+/LO region in extra-striate visual cortex correlated with mTBI and PTSD symptoms, especially light sensitivity. Moreover, higher FA values near the left optic radiation (OR) were associated with both light sensitivity and higher BOLD activity in the MT+/LO region. The MT+/LO region was localized as a region of abnormal functional connectivity with central white matter regions previously found to have abnormal physiological signals during visual eye movement tracking (Astafiev et al., 2015). We conclude that mTBI symptoms and light sensitivity may be related to excessive responsiveness of visual cortex to sensory stimuli. This abnormal sensitivity may be related to chronic remodeling of white matter visual pathways acutely injured.

KEYWORDS:

Behavioral assessments; Diffusion tensor imaging; MRI; Traumatic brain injury

PMID:
26909324
PMCID:
PMC4732189
DOI:
10.1016/j.nicl.2016.01.004
[Indexed for MEDLINE]
Free PMC Article

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