Publications (2)0 Total impact
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ABSTRACT: Three experiments were conducted to examine the conditions which determine what is called "Mitnahmeeffekt" in binocular stereopsis. Two factors of retinal disparity and proximity were treated among others. Subjects observed various types of stereograms through the haploscope and made depth or distance judgments as to the neutral parts (induced parts) providing no retinal disparity in the stereograms. The results were as follows. "Mitnahmeeffekt" increased linearly with increase in binocular disparity in the inducing parts of stereograms. It decreased monotonically with increase in directional separation between the inducing parts and the induced parts.
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ABSTRACT: An experiment was conducted to provide fundamental data for analyzing the mental process of veridical size perception with distance to the visual object variant. Subjects made "same" or "different" judgments on the size of two luminous rectangles presented in a dark room. The significant finding was that correct reaction times increased with increases in depth between the two rectangles. There seems to be two possible sources that might yield such a result. One is the operation of accommodation and vergence eye movement necessary for fixating the eyes at the appropriate point in space. This operation will need more time as the depth between two objects increases. The other is a sort of mental operation called "mental sliding" (Makino, 1975) analogous to "mental rotation" (Shepard & Metzler, 1971). The "mental sliding" operation is supposed to be a process which shifts imaginarily one of the two objects in depth to the other. The duration of this mental operation might increase with increase in the depth. Further experiments are required in order to decide which of these two possible operations is responsible for the present result.
