Alternative perceptual states 'apparent motion' and 'perceived simultaneity' lead to differences of induced EEG rhythms

An investigation of the cortical response (EEG) to periodically presented s timuli producing an ambiguity between long-range apparent motion and flicke r is reported. ERPs to stimulus onsets differed slightly between the two pe rcepts, in accordance with the results of Manning et al. (1988), Selmes et al. (1997). Induced rhythms exhibited a strong increase in induced beta and gamma powers at electrode positions T7 and Ts during the perception of app arent motion in two out of 10 participants. In addition, a small overall in crease in alpha power at 12-13 Hz and a decrease in delta power below 3.5 H z during perceived motion were found. The results indicate that a variety o f different neural rhythms are involved in the perception of long-range app arent motion. (C) 2000 Elsevier Science B.V. All rights reserved.