Citation

Viviani P, Stucchi N. J. Exp. Psychol. Hum. Percept. Perform. 1992; 18(3): 603-623.

Affiliation

Department of Psychobiology, Université de Genève, Switzerland.

Copyright

(Copyright © 1992, American Psychological Association)

DOI

unavailable

PMID

1500865

Abstract

Six experiments demonstrate a visual dynamic illusion. Previous work has shown that in 2-dimensional (2D) drawing movements, tangential velocity and radius of curvature covary in a constrained manner. The velocity of point stimuli is perceived as uniform if and only if this biological constraint is satisfied. The illusion is conspicuous: The variations of velocity in the stimuli exceed 200%. Yet movements are perceived as uniform. Conversely, 2D stimuli moving at constant velocity are perceived as strongly nonuniform. The illusion is robust: Exposure to true constant velocity fails to suppress it. Results cannot be explained entirely by the kinetic depth effect. The illusion is evidence of a coupling between motor and perceptual processes: Even in the absence of any intention to perform a movement, certain properties of the motor system implicitly influence perceptual interpretation of the visual stimulus.

Language: en