Differential contributions of circular and elongated spatial filters to the Café Wall illusion.
The Café Wall illusion is induced in part by the spatial filtering properties of circular-symmetric receptive fields at the retina, and in part by cortical processes, presumably that have elongated receptive fields. Two experiments are reported that address these two contributions. The first shows a reversal effect that is consistent with brightness-induction and related theories. The second shows extinction of the effect in a manner predicted by recent observations of gating nonlinearity in cortical cells.
Lulich
D P
DP
Department of Computer Science, University of Oregon, Eugene 97403.
Stevens
K A
KA
D003342:Corpus Striatum / Q000502:physiology*; D006801:Humans; D007088:Illusions; D009903:Optical Illusions / Q000502:physiology*; D012160:Retina / Q000502:physiology*