Colour processing

The notion that different areas of the cortex are involved in colour and motion processing received support in a study by Cavanaugh, Tyler, and Favreau (1984). They presented a moving grating consisting of alternating red and green bars possessing equiluminance or equal brightness. The observers reported either that the bars did not seem to be moving, or there was only a modest impression of movement. Theoretically, it was assumed that the moving display only affected the colour processing system. It did not stimulate the motion processing system, because that system responds only to differences in brightness.

Evidence that area V4 is specialised for colour processing was reported by Lueck et al. (1989). They presented coloured or grey squares and rectangles to observers. PET scans indicated that there was about

V2 V3 V3A

V2 V3 V3A

Vfl
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