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

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2° in diameter; luminance of the field and duration of exposure were varied. As expected, increasing luminance lowered the threshold for motion markedly; but perhaps unexpected, increasing exposure duration also caused the threshold to fall. 7 minutes of arc per second was required, and about half of that when it lasted 16 seconds. Moreover, when Leibowitz (1955b) added context or reference lines to the background, thresholds at short durations of exposure were unaffected, but thresholds at long durations of exposure fell markedly.

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. Judged space and judged time, that is to say, do not increment at the same rate. This fact adds a further complication to the calculation of velocity.

Rather, the evidence suggests that what is measured as a velocity is actually the attribution of figure displacement to certain perceptual operations that require time to run off. In addition, we have seen that measurements even of real motion are often predicated on a faulty analogy to mechanics. The data raise the question whether the visual system ever notes velocity directly, and suggest, to the contrary, that some of the constituents of velocity such as time, distance, and intermittency are more important to judgment than is velocity itself.

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