Different patterns of abnormal gamma oscillatory activity in unipolar and bipolar disorder patients during an implicit emotion task

► Distinct altered gamma activity in BD and MDD patients. ► BD patients had enhanced visual perception and impaired attention function. ► MDD patients had hypoactivities of insufficient maintaining task-related engagement. ► MDD patients had hyperactivities of bottom-up affective and perceptual processes. ► The parietal and left posterior temporal gamma activity can distinguish BD from MDD.