Traumatic brain injury patients show increased gamma activity during visual feature-matching

Abstract Traumatic brain injury (TBI) patients typically respond more slowly than normal controls in visual discrimination tasks. This study compared oscillatory brain activities related to visual feature-matching between 10 healthy subjects and 7 recovering TBI patients. While both groups performed similarly in terms of reaction time and accuracy, the TBI patients showed enhanced gamma (30–60 Hz) activity in the visual cortex. This finding may reflect the extra effort that the patients had to spend to perform normally.