Sustained cortical potentials evoked in humans by binocularly correlated, uncorrelated and disparate dynamic random-dot stimuli.

On-line computer generated random-dot targets ('Julesz patterns') were alternated every 720 msec between binocular correlation (percept: flat) and uncorrelation (percept: wooly) or partial disparity (percept: depth). Cortical evoked potentials recorded between anterior and posterior electrodes showed sustained late responses (peaks 200-400 msec), anteriorly negative for correlation and positive for uncorrelation or disparity, in all 13 subjects used. Shift of attention from one to the other stimulus condition and random stimulus intervals did not change the results.