Figure 5.

Task effects on EEG responses to disparity stimuli under different Fourier filtering regimes that highlight sustained vs. transient response components (N = 20). (a) and (b) show responses to the plane stimulus (absolute disparity); c and d show responses to the grating stimulus (relative and local absolute disparities). The “Odd” filter (left column) preserves the odd harmonics of the fundamental frequency (1F1, 3F1, 5F1, etc.) and highlights sustained response components driven by the amplitude of the 1F1 response. Where this signal is present (c), there is a significant effect of task. The “Even” filter (right column) preserves the even harmonics of the fundamental frequency (2F1, 4F1, 6F1, etc.) and reveals transient, temporally symmetric responses at disparity on- and off-sets. There is no task effect for the plane stimulus (b) and there are some small effects for the grating (d), but these are localized outside the main positive/negative deflections that demarcate the stimulus transitions. Data are group-level averages weighted by RC1, errors are $\pm$ 1 SEM and the color bars indicate significance (paired-samples t-test). Segments marked with (*) indicate sequential, significant time points that pass the threshold for run-length correction and grey = nonsignificant.