Abstract
A compelling impression of movement, which is perceptually indistinguishable from a real displacement, can be elicited by patterns containing no spatially displaced elements. An apparent oscillation, w-movement, was generated by a stationary pattern containing a large number of horizontal pairs of spatially adjacent dots modulated in brightness. The observer’s task was to adjust the perceived amplitude of the w-motion to match the amplitude of a real oscillation. All of the data can be accounted for by a simple rule: If the relative change in the luminance,W = αL/L, between two adjacent stationary dots is kept constant, the distance over which these dots appeared to travel in space comprises a fixed fraction of the total distance by which they are separated. The apparent amplitude of the w-motion increases strictly in proportion with luminance contrast, provided that the contrast is represented in the motion-encoding system by a rapidly saturating compressive Weibull transformation. These findings can be explained in terms of bilocal motion encoders comparing two luminance modulations occurring at two different locations.
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This research was supported by a James S. McDonnell Foundation grant and Estonian Science Foundation Grant 450 to J.A.
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Allik, J., Pulver, A. Magnitude of luminance modulation specifies amplitude of perceived movement. Perception & Psychophysics 57, 27–34 (1995). https://doi.org/10.3758/BF03211847
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DOI: https://doi.org/10.3758/BF03211847