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Science 5 June 1981:
Vol. 212. no. 4499, pp. 1172 - 1175
DOI: 10.1126/science.212.4499.1172
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Articles

A Novel Illusion of Bars Made from Triangles

L. E. LEGUIRE 1, R. BLAKE 1, and M. E. SLOANE 1

1 Cresap Neuroscience Laboratory, Northwestern University, Evanston, Illinois 60201

A repetitive pattern of a triangular luminance profile may be perceived as a triangular-wave grating or as a square-wave grating. This illusion may reflect the operation of cortical phase-selective mechanisms that are biased toward particular phase relations and favor abrupt luminance gradients.

Submitted on November 6, 1980
Revised on January 19, 1981

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Science. ISSN 0036-8075 (print), 1095-9203 (online)