Mild head injury (MHI) has been defined as either a blow to the head or a whiplash injury that briefly renders an individual dazed, confused or unconscious. Such injuries are very common and costly. Recovery of cognitive function after MHI is thought to be relatively swift and complete. Many of the tasks used to chart recovery from MHI, however, may paint a rosier picture than is warranted. The present work demonstrates that university students with self-reported MHI show behavioral and electrophysiological evidence of subtle neurocognitive impairment up to eight years post injury. These findings challenge existing notions of quick and complete recovery from MHI.