Illusory Motion Processing

The role of areas V1 and V2 in the processing of illusory motion has been studied using PET to measure rCBF. Subjects viewed two different gray scale images based on Enigma designed by I. Leviant. The first consisted of concentric gray rings separated by interrupted black and white spokes. Viewing of this image produces the illusion of rotary motion within the rings. In the second image the spokes continued through the concentric rings and the illusion of rotary motion is not observed. This study revealed strong activation of area MT but little or no activation of areas V1-V2. Thus, these lower cortical areas do not appear to participate in the perception of illusory motion.

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