Although several small studies suggest that soccer-related concussions and repeated heading of soccer balls may cause slight mental deficits, the issue remains controversial. Neuropsychological impairment in amateur soccer players. Symons, D.A., and D.A. Abwender. Evidence of neuropsychological impairment in soccer athletes. 107 th Annual Convention of the American Psychological Association.
Soccer heading frequency predicts neuropsychological deficits.
Archives of Clinical Neuropsychology . From Science News , Vol. Copyright 1999, Science Service.