Effect of monocular and binocular vision, brightness, and apparent size on the sensitivity to apparent movement in depth.

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Abstract
Sensitivity to the detection of illusory visual movement caused by a continuous increasing change on stimulus size was determined for monocular and binocular vision for two brightness levels of the stimulus, .2 and 2 Ft.L. Sensitivity was also measured as a function of the apparent size of the stimulus. The stimulus was a white equilateral triangle observed against a black background. Reaction time measured to the nearest 100th of a second was used as the index of sensitivity. Based upon observations of 24 subjects under all experimental conditions the results showed sensitivity varied with both mode of vision and brightness, the latter being the more important variable of the two. The apparent size of the stimulus had no effect on sensitivity. Results are discussed in terms of other visual sensitivity data and the effects of "behavioral" and "non-stimulus" factors on perceptual response.

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