Visual Evoked Potential Effects on Magnocellular and Parvocellular Pathways from Athletes After Mild Traumatic Brain
Mark H Myers1, Nidhish Kalyanakumar1, Paul Harris2
1Department of Anatomy and Neurobiology, University of Tennessee Health Sciences Center, Memphis, TN, USA.
Background:
The objective of this study is to examine magnocellular and parvocellular pathways differentiation based on checkerboard spatial frequency stimulation between normal and visually impaired individuals from athletes with mild traumatic brain injury.
Purpose:
Athletes who exhibited photophobia, and blurriness were subjected to 5 spatial frequency stimuli presented to the left and right eye, and both eyes simultaneously to determine the type of receptive field loss deprecation based on sports-related brain trauma.
Methods:
Checkerboard stimulation enables the measurement between 2 visual processing pathways and enables the determination of the integrity of visual processing through visual evoked potentials (VEPs).
Conclusion:
The principal results reflect P1 responses demonstrated distinct changes in amplitude from mTBI (>5 µV) from normal cohorts concluding higher P1 amplitude of the VEP in mTBI cohorts had increased after injury. Latency in P1 was not as distinct as amplitude changes. Our major conclusion is that most of the mTBI cohort exhibited receptive field loss across all the patients appears to be magnocellular process deprecation due to frequent instances of 8 × 8 and 16 × 16 spatial frequencies input as it relates to amplitude and latency output.
