Post-concussion syndrome
About 10% of people with PCS develop sensitivity to light or noise, about 5% experience a decreased sense of taste or smell, and about 14% report blurred vision. People may also have double vision or ringing in the ears, also called tinnitus. PCS may cause insomnia, fatigue, or other problems with sleep.
Post-traumatic amnesia
There is a significant link between individuals currently suffering from PTA and their performance on the Wechsler Adult Intelligence Scale (WAIS). The scores of those currently experiencing an episode of PTA were compared to individuals who had previously suffered a traumatic brain injury resulting in PTA. Those still suffering from PTA performed significantly worse on both the performance and the verbal subscales of the WAIS. Also, people in early stages of PTA have substantial impairment to anterograde memory function. For example, in the case report of a patient referred to as "JL", Demery et al. noted that his memory impairments were so severe following his injury that he had forgotten that he had attended a Major League Baseball game less than 30 minutes after returning to the center where he was being treated.