A brief summary of current research.
Martini DN, Sabin MJ, DePesa SA, Leal EW, Negrete TN, Sosnoff JJ, Broglio SP Archives of Physical Medicine and Rehabilitation, Vol 92(4) , 2011, pp 585-589.
Researchers found that people with a history of concussion walked more cautiously than those without concussion. The mechanics of their walk included slower speed and more time on two legs during their stride. Also, this effect on walking became more profound as the number of concussions increased.