The Equiluminant Remote-Controls Illusion

We test variants of the remote-controls illusion in configurations that modulate in luminance and in chroma. We use three different variants of the RCI to test different spatial properties of the illusion, in order to probe the differences in the perception of this illusion in settings with and without luminance contrast. We find that the key gap-dependent phase properties of the remote-controls illusion identified by Hedjar et al extend to versions that modulate in chroma, but with differences in arrangement consistent with larger areas of integration of chromatic contrast signals.We extend the model developed by Hedjar et al to incorporate a time delay between the center and surround, and to extract contrast from the edge of the modulating bar in the stimulus. We show that these modifications improve the predictive power of the model, which is able to explain many of the properties of the remote-controls illusion. We use this model to predict the scale and bandwidth of retinal ganglion cells responsible for integrating luminance contrast and chromatic contrast, and find that the predicted filters for chroma are larger in scale and lower in bandwidth than the equivalent ones for luminance.