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Science 30 May 1969:
Vol. 164. no. 3883, pp. 1087 - 1088
DOI: 10.1126/science.164.3883.1087
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Articles

Objective Measure of the Dynamics of a Visual Movement Illusion

John Thorson 1, G. David Lange 1, and Marguerite Biederman-Thorson 1

1 Department of Neurosciences, School of Medicine, University of California, San Diego, La Jolla, 92037

Apparent movement in peripheral vision can be induced by sequential flashing of two dots that are spatially unresolved. Subjects used this illusion to make forced-choice estimates of the directional sequence of the two dots. Performance at this task defines spatiotemporal conditions that induce the illusion without reliance upon subjective distinctions of "movement" from "successivity" and "simultaneity." The dynamics of the illusion, defined in this way, are measured and compared with those for after-flash inhibition and the perception of real movement.

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