立体視における奥行の消失と反転

鬢櫛 一夫

doi:10.4992/jjpsy.50.256

DISAPPEARANCE AND REVERSAL OF DEPTH IN STEREOPSIS

KAZUO BINGUSHI

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JOURNAL FREE ACCESS

1979 Volume 50 Issue 5 Pages 256-264

DOI https://doi.org/10.4992/jjpsy.50.256

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Published: January 20, 1980 Received: March 10, 1979 Available on J-STAGE: July 16, 2010 Accepted: - Advance online publication: - Revised: -
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Date of correction: July 16, 2010 Reason for correction: - Correction: ABSTRACT Details: Wrong : Four experiments were conducted in order to examine the transition of depth selection and to study how only a single depth plane could be perceived by mutual inhibition among disparities.
Experiment I: With random-dot stereo-grams of Julesz-type which differed in disparity, the time required for the stereoscopic depth disappearance was measured, under the condition that the subject fixated his eyes on to the mid area between two targets in the background. It was found that the reaction time was shorter when the magnitude of disparity was larger (see Fig. 1).
Experiment II: With ambiguous stereo-grams (see Fig. 2), one can see only one of the two depth planes at a time. The relative magnitude of the pair of crossed and uncrossed disparity was systematically changed so as to get various apparent depths, and the cumulative perception time for each depth was measured for 90sec. It was found that the depth of relatively smaller disparity was perceived longer regardless of the absolute magnitude of disparity and the direction of disparity (see Fig. 3).
Experiment III: The time required for depth disappearance with random-dot target as well as the one for reversal of depth with ambiguous target were measured on each trial. It was found that a shorter time was required for ambiguous target to be seen reversed than for the depth of random-dot target to disappear. It suggests that the detection of disparity in suppressed depth might be strong enough to inhibit the detection of disparity in perceived depth.
Experiment IV: With ambiguous stereo-grams, the number of times of depth reversals was counted under fixation condition and fixation-free condition. It was found that stereoscopic depth reversal occurred more frequently under fixation than under fixation-free condition. This result suggests that the detection of disparity in perceived depth decreases at a faster rate than in suppressed depth.
These results suggest that the whole range of disparities might be detected simultaneously and that inhibition mechanism stated above might have some important role in stereopsis.
Right : Four experiments were conducted to examine the transition of depth selection by mutual inhibition among disparities. (a) With random-dot stereograms, the time required for stereoscopic depth disappearance under fixation was found to be an inverse function of the magnitude of disparity. (b) Measurement of the cumulative time for perception of ambiguous stereograms showed that the depth was perceived longer with relatively smaller disparity. (c) The perception of stereoscopic depth under fixation was more stable in random-dot target than in ambiguous target. (d) Stereoscopic depth reversal occurred more frequently under fixation than in free observation. These results suggest that the whole range of disparities might be detected simultaneously and that the inhibition mechanism might have some important role in stereopsis.

Abstract

Four experiments were conducted to examine the transition of depth selection by mutual inhibition among disparities. (a) With random-dot stereograms, the time required for stereoscopic depth disappearance under fixation was found to be an inverse function of the magnitude of disparity. (b) Measurement of the cumulative time for perception of ambiguous stereograms showed that the depth was perceived longer with relatively smaller disparity. (c) The perception of stereoscopic depth under fixation was more stable in random-dot target than in ambiguous target. (d) Stereoscopic depth reversal occurred more frequently under fixation than in free observation. These results suggest that the whole range of disparities might be detected simultaneously and that the inhibition mechanism might have some important role in stereopsis.

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