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Traumatic Brain Injury l: Introduction

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Updated: May 9, 2026

An Investigation of the Effects of Sports-related Concussion in Youth Using Functional Magnetic Resonance Imaging and the Head Impact Telemetry System

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Published on: January 12, 2011

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.

Neuroscience Insights

|November 29, 2024

Summary

Mild traumatic brain injury (mTBI) in athletes can cause magnocellular pathway dysfunction, impacting visual processing. This study used checkerboard stimuli and visual evoked potentials (VEPs) to identify visual deficits in mTBI athletes.

Keywords:

Magnocellular pathway mild traumatic brain injury parvocellular pathway visual evoked potentials

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Last Updated: May 9, 2026

An Investigation of the Effects of Sports-related Concussion in Youth Using Functional Magnetic Resonance Imaging and the Head Impact Telemetry System

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Published on: January 12, 2011

Vision Training Methods for Sports Concussion Mitigation and Management

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Published on: May 5, 2015

Objectively Assessing Sports Concussion Utilizing Visual Evoked Potentials

Objectively Assessing Sports Concussion Utilizing Visual Evoked Potentials

Published on: April 27, 2021

Area of Science:

Neuroscience
Ophthalmology
Sports Medicine

Background:

Investigating visual pathway differentiation in athletes with mild traumatic brain injury (mTBI).
Focusing on magnocellular and parvocellular pathways using checkerboard spatial frequency stimulation.
Comparing visual processing in normal individuals versus those with mTBI.

Purpose of the Study:

To differentiate magnocellular and parvocellular pathways in athletes with mTBI.
To assess receptive field loss and its relation to sports-related brain trauma.
To analyze visual processing deficits, including photophobia and blurriness, in affected athletes.

Main Methods:

Utilizing checkerboard stimulation to measure visual processing pathways.
Employing visual evoked potentials (VEPs) to determine visual processing integrity.
Presenting 5 spatial frequency stimuli to assess receptive field loss.

Main Results:

Significant changes in P1 response amplitude were observed in the mTBI cohort compared to normal controls.
Higher P1 amplitude in VEPs indicated increased visual processing changes post-injury in mTBI athletes.
Latency changes in P1 were less distinct than amplitude variations.

Conclusions:

The study concludes that mTBI in athletes often leads to magnocellular pathway deprecation.
Receptive field loss was prevalent across the mTBI cohort, particularly at 8x8 and 16x16 spatial frequencies.
VEP analysis revealed distinct amplitude changes indicative of visual processing alterations post-mTBI.