Document Detail

Elevated coherent motion thresholds in mild traumatic brain injury.
MedLine Citation:
PMID:  21524599     Owner:  NLM     Status:  In-Data-Review    
PURPOSE: Individuals with mild traumatic brain injury (mTBI) frequently complain of increased sensitivity to visual motion. Thus, the purpose of this study was to assess the coherent motion threshold (CMT) in subjects with mTBI and reported visual motion sensitivity.
METHODS: Fourteen adult subjects with mTBI and symptoms of motion sensitivity were tested. They were compared with 40 age-matched asymptomatic visually normal individuals. CMT was assessed using a 2-alternative, forced choice paradigm. A symptom rating-scale questionnaire related to motion and light sensitivity, vertigo, and self-reported reading ability was also administered to the mTBI group.
RESULTS: Mean CMTs were significantly elevated in the mTBI (8.81%) versus the normal subjects (6.53%). There was a trend for a progressive increase in mean CMT in mTBI with increased symptoms related to visual motion sensitivity and vertigo. However, there was no apparent relation to either light sensitivity or self-reported reading ability in mTBI. There was no significant age effect in either group.
CONCLUSIONS: The elevated CMT in mTBI suggests damage to the magnocellular pathway, such as extrastriate visual cortical area V5, visual area medial temporal, and the medial superior temporal cortex, which is involved directly in various aspects of motion processing. These findings are consistent with the subjects' symptoms of motion sensitivity and vertigo in their natural environments.
Reena Patel; Kenneth J Ciuffreda; Barry Tannen; Neera Kapoor
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Optometry (St. Louis, Mo.)     Volume:  82     ISSN:  1558-1527     ISO Abbreviation:  Optometry     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-04-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100912421     Medline TA:  Optometry     Country:  United States    
Other Details:
Languages:  eng     Pagination:  284-9     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 American Optometric Association. Published by Elsevier Inc. All rights reserved.
State University of New York State College of Optometry, New York, New York.
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