Figure 1: The dynamic of EEG activity in alpha frequency band during perception of depth with false objects appearing to be in front of the flat plane of random-dot stereogram without using a stereoscope: (a) the topo map of alpha-activity represented as a ratio of alpha oscillation power after/before the onset of the false image perception built for individual EEG recording; (b) averaged alpha oscillation power at C3O1, FP1C3, and FP2C4 recording sites, mean ± SE; corresponds to .