The influence of colour and contour rivalry on the magnitude of the tilt illusion

Abstract Tilt illusions were generated in three experiments by surrounding a central grating by another differing in orientation by 10 or 15°. The magnitude of the illusion (a) was not influenced by the colour of the central and surround grating, (b) was reduced to about 50% under interocular transfer and (c) was unchanged during binocular rivalry between tilted and horizontal surrounds. The results are considered to support the equation of the tilt illusion and aftereffect with regard to the neural mechanisms involved in their generation.

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