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The concussed brain at work: fMRI study documents brain activation during concussion recovery
Date:8/19/2013

For the first time, researchers have documented irregular brain activity within the first 24 hours of a concussive injury, as well as an increased level of brain activity weeks latersuggesting that the brain may compensate for the injury during the recovery time.

The findings are published in the September issue of the Journal of the International Neuropsychological Society.

Thomas Hammeke, PhD, professor of psychiatry and behavioral medicine at the Medical College of Wisconsin, is the lead author. Collaborators at the Cleveland Clinic; St. Mary's Hospital in Enid, Okl.; the University of North Carolina; Franklin College in Franklin, Ind., and the Marshfield Clinic in Marshfield, Wis., co-authored the paper.

To study the natural recovery from sports concussion, 12 concussed high school football athletes and 12 uninjured teammates were evaluated at 13 hours and again at seven weeks following concussive injury.

The concussed athletes showed the expected postconcussive symptoms, including decreased reaction time and lowered cognitive abilities. Imaging via fMRI (functional magnetic resonance imaging) showed decreased activity in select regions of the right hemisphere of the brain, which suggests the poor cognitive performance of concussion patients is related to that underactivation of attentional brain circuits.

Seven weeks post-injury, the concussed athletes showed improvement of cognitive abilities and normal reaction time. However, imaging at that time showed the post-concussed athletes had more activation in the brain's attentional circuits than did the control athletes.

"This hyperactivation may represent a compensatory brain response that mediates recovery," said Dr. Hammeke. "This is the first study to demonstrate that reversal in activation patterns, and that reversal matches the progr
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Contact: Maureen Mack
mmack@mcw.edu
414-955-4744
Medical College of Wisconsin
Source:Eurekalert

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