Tamada Y, Sato M, 2010, "Apparent shape distortion induced by binocular disparity depends on disparity distribution pattern" Perception 39 ECVP Abstract Supplement, page 72
Apparent shape distortion induced by binocular disparity depends on disparity distribution pattern
Y Tamada, M Sato
The direction of depth specified by disparity is sometimes perceived opposite to that of the geometrical prediction, referred as depth reversal. Previous studies suggested that depth reversal occurs because apparent shape distortion induced by disparity serves as a perspective cue to depth opposite to that by disparity and more weight is assigned to perspective than to disparity. Our previous study showed that depth reversal occurred frequently in a slanted flat surface but not in a curved surface simulated by disparity. This suggested that apparent shape distortion and/or weighting to depth cues depend on disparity distribution pattern. Present study tested this expectation. The stimulus was a grid pattern subtended 20 deg with depth modulation of disparity and/or perspective in presenting a slanted or curved surface. Apparent depth and shape was quantified by a matching method. Five out of sixteen subjects perceived the reversed depth only in the flat surface. These five subjects gave greater weight to perspective than to disparity, but their weighting did not differ among the disparity patterns. The greater shape distortion was perceived in the flat surface than that in the curved one. We concluded that the shape distortion, not weighting, depends on the disparity distribution pattern.
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