Figure 4
From: Neural oscillations promoting perceptual stability and perceptual memory during bistable perception
Alpha and beta amplitudes are higher in stable trials than in reversal trials. (A) An example EEG recording over 10 s of intermittently viewing the Necker cube (black curve is signal filtered in the alpha band and red curve is its amplitude envelope). Colored areas indicate blank periods; white areas indicate image presentation periods (1.5 s each) Green and blue button press symbols indicate reported perceptual switches to perceiving a green-fronted or blue-fronted cube, respectively. Each blank period was labeled a stable or reversal trial based on whether percepts before and after the blank period were the same or different. (B) Curves show alpha (Left) and beta (Right) amplitudes averaged across all channels for stable blank periods (orange curves) and reversal blank periods (cyan curves) (shading shows fixed-effects s.e.m.). Gray shaded areas indicate blank periods; white areas indicate image presentation periods (1.5 s each). Horizontal black bars indicate time periods of significant difference between stable and reversal trials (cluster-based permutation test, p < 0.05, two-tailed). Topo-plots show differences in band-limited amplitude (stable minus reversal trials) using 500 ms bins. Black dots indicate channels with significant differences between stable and reversal trials (cluster-based permutation test, N = 23, p < 0.05, two-tailed). Only data for cube trials are shown here (see Fig. S4 for face-vase trials).
