Binocular disparity and perceived relative distance: an examination of two hypotheses.

Abstract One hypothesis states that the ratio of the perceived depth interval between two points to the perceived distance from the observer of the nearer point depends on the perceived distance of the farther point as well as the disparity between them. The second hypothesis states that this ratio depends on disparity alone and is proportional to the disparity. Three experiments are described in which observers set lights at various fractions of the distance from themselves to a fixed light. The results favor the second hypothesis, but suggest that a modification of it may provide a better description of the data especially at short distances. The results are also consistent with the hypothesis that it is the disparity between each point and the farthest point in the configuration which is critical in determining perceived relative distances.

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