OBJECTIVE: To prospectively measure the immediate neurocognitive effects and early
course of recovery from concussion and to examine the effects of loss of consciousness
(LOC) and posttraumatic amnesia (PTA) on the severity of neurocognitive impairment
immediately after concussion. METHODS: A sports-related concussion research model was
used to allow prospective immediate evaluation of concussion. A total of 2385 high school
and college football players were studied. Ninety-one players (3.8%) sustained concussions …