By Paul A. Kolers and H. J. Eysenck (Auth.)
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2 have been redrawn in Fig. 3 to show the computed threshold velocity of motion as a function of the spatial separation between the flashes. ) FIG. 2. The data of the preceding figure are redrawn to sum, on the ordinate, the duration of the first flash and the interstimulus interval separating it from the second (onset-to-onset interval). between them; in addition, velocity increases as spatial separation is increased. There is no constancy of velocity of objects in apparent motion. Neuhaus's subjects varied in the extent of their practice, and other conditions were also varied.
The statistical difference due to disparity is so small as to suggest that the Gestalt emphasis upon shape as primary is too restrictive; indeed, the experiments that follow show that the emphasis is wrongly placed. Let us pause for a moment first to describe the testing situation and the way the experiments will be described. 20 • 10 25 50 71 100 125 165 210 260 390 i s i (msec) FIG. 5. Summary of the data for same pairs, disparate pairs, and some others. by means of a four-channel tachistoscope that timed the presentation of two flashes and of the blank intervals between them.
Instead, subjects said "that their judgments of direction of movement were based on the time difference in the appearance and disappearance of the target, not on the actual perception of target movement" (p. 453). Thus while one can consider perceived velocity as the equal of distance divided by time, subjects seem to use the latter two variables themselves in their judgments rather than judging velocity directly. Smith and Gulick (1956, 1957) undertook a more direct test of the limitations on visibility of the moving object as a function of its speed.
Aspects of Motion Perception by Paul A. Kolers and H. J. Eysenck (Auth.)