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ISSN : 1226-9654

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Vol.17 No.2

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The Effect of Relative Stereo Depth Provided by Local Disparity in a Cue-Conflict Situation

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
2005, v.17 no.2, pp.185-202

(2005). The Effect of Relative Stereo Depth Provided by Local Disparity in a Cue-Conflict Situation. The Korean Journal of Cognitive and Biological Psychology, 17(2), 185-202.

Abstract

A cue-conflict situation can be created in the typical Pulfrich setting when an opaque surface is placed just behind the physical path of the pendulum: the depth of the pendulum from the Pulfrich effect is in conflict with that from occlusion. From this experimental setting, most observers reported that the far path seems to shrink and the pendulum was perceived to move in front of the surface (Perception, 33, (2004) 1201-1213). In the present study, it is examined whether the additional relative stereo depth by local disparity, which is contradicted with depth from occlusion, could change the perceived path of the Pulfrich pendulum. In order to provide the local disparity information in the inner region of the surface, thereby providing the relative stereodepth between the pendulum and the surface, the width of the surface and the density of the texture attached on the surface were varied in the experiment 1 and experiment 2, respectively. A large individual difference on the perceived depth of the farthest point of the path was found. About 25-35% of the observers reported that in all conditions, the pendulum was perceived to rotate in front of the surface, which was predicted by the depth information from the occlusion. However, most observers perceived that the pendulum was more likely to rotate behind the surface as the width was narrower and the density of the random texture was increased. These results suggest that the efficiency of occlusion might be weakened by the conflicting relative stereodepth, and the relative stereo depth might be extracted before depth interpolation process from the local disparity.

keywords
깊이 단서의 상충, 양안 부등, Pulfrich 현상, 상대적 입체시 깊이, depth cue conflict, binocular disparity, the Pulfrich phenomenon, relative stereodepth, depth cue conflict, binocular disparity, the Pulfrich phenomenon, relative stereodepth

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