Visual evoked potentials as an aid in evaluating brain dysfunction following concussional injury: an animal model.

Visual evoked potentials were recorded sequentially, using permanent epidurally implanted electrodes, before and after accelerating the heads of rabbits. The amplitude of VEP, recorded after lesioning, was diminished and recovery time was prolonged depending on the amount of acceleration and the extent of brain lesions found later in histological examinations. VEP reflected damage to the brain more precisely than EEG or somatosensory evoked potentials, thus giving values for judging the extent of lesions in patients with brain injuries.