Curvature as a Feature of Pattern Vision

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Science  14 Sep 1973:
Vol. 181, Issue 4104, pp. 1070-1072
DOI: 10.1126/science.181.4104.1070


Prolonged inspection of convex lines of one color and concave lines of another color can cause the appearance of oppositely colored aftereffects in curved, achromatic test lines. These effects, strongly dependent on radius of curvature, cannot be attributed to tilt or orientation. It is concluded that these results are not encompassed by models of the visual system that are based on rectilinear arrays and that curvature is a specific feature of human visual perception.