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By Paul A. Kolers and H. J. Eysenck (Auth.)

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4. The likelihood of seeing motion between two flashes whose durations and interstimulus intervals were varied. Duration is shown for the separate curves in msec. Adapted from Kolers (1964). Copyright © 1 9 6 4 by Scientific American, Inc. All rights reserved. of spatial separation required less than a doubling of temporal separation to maintain a perception of movement. The ratios are even larger in Neuhaus's data. Measurements on the scaling of space and of time have been made by Mashhour (1964), who found that judged spatial extent matches physical extent closely, but judged time does not match measured time closely.

The two shapes of a pair were presented at a fixed duration but at many different interstimulus intervals; the subjects indicated after each presentation of a pair of shapes whether they had seen smooth continuous motion between them. If figural processes were important to the perception of the illusion, we would expect that many fewer judgments of smooth, continuous movement would be made with the disparate pairs than with the same pairs. To the contrary, it was found that differences between the items of the pairs made very little difference to the perception.

Viewing distance was 1 meter. In all of the tests to be reported, only well-practised subjects were used, and usually only two or three of them, hence the demonstrations should be read for their qualitative rather than their quantitative significance. The experiments were carried out with displays composed of simple geometric figures, most of them small. A circle 6 mm in diameter (about 23 minutes of visual angle) was taken as the standard figure; it could appear in any of seven positions in a horizontal row, whose center to 52 ASPECTS O F MOTION P E R C E P T I O N SPACE ARRAYS UJ I— FIG.

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