The study, " Detected Cognitive Impairment in High School Football Players Without Clinically Diagnosed Concussion ", was published in 2013 in the " Journal of Neurotrauma " and observed 21 high school players throughout a season; it determined that even players who would not be diagnosed with a concussion based on their symptoms can display notable impairments via MRIs and verbal or cognitive testing, indicating that the current tests used on the sideline to assess concussions may not be adequate.
