Supporting information for Murray et al. (2002) Proc. Natl. Acad. Sci. USA, 10.1073/pnas.192579399
Fig. 7.
Eye movement data were collected using a video-based eye movement tracker, while observers viewed the bistable stimulus and recorded their perceptual state by means of a key press. Tracking data was low-pass filtered and saccadic eye movements were detected by filtering the data for step changes exceeding a peak velocity of 50°/s. The bar chart shows the mean of the saccade amplitudes in the horizontal (x) and vertical (y) direction that occurred during the two perceptual states for 1,000 saccades, and error bars represent the standard deviation of the amplitudes. The contour plots represent Gaussian kernel density estimates of the 2D saccade amplitude distribution. The figure demonstrates that there were no differences in eye movements during the two perceptual states.