Motivational determinants of the "contingent negative variation".
D000293:Adolescent; D000328:Adult; D002540:Cerebral Cortex / Q000502:physiology*; D004558:Electric Stimulation; D004576:Electromyography; D004594:Electrophysiology; D006801:Humans; D008027:Light; D008297:Male; D009042:Motivation; D011930:Reaction Time; D013016:Sound