Abstract
The effect on the perceived distance of a test object of fixating to a distance different from that of the test object was investigated using monocular observation and two methods for measuring perceived distance. One method, the size adjustment procedure, applying the size-distance invariance hypothesis, measured perceived distance by measuring perceived size. The results from this method were compared with those from a head-motion procedure which used the apparent concomitant motion resulting from head motion to measure perceived distance. The results from both procedures indicated that the apparent distance of the test object physically located at a constant distance varied directly as a function of the fixation distance. This occurred despite the presence of texture on the walls and floor of the visual alley. These and other perceptual effects are interpreted as demonstrating that errors in perceived distance (contrary to the theory of direct perception) are a common occurrence in ordinary visual fields.
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This research was supported by Research Grant BNS 77-16620 from the National Science Foundation.
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Gogel, W.C. The common occurrence of errors of perceived distance. Perception & Psychophysics 25, 2–11 (1979). https://doi.org/10.3758/BF03206103
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DOI: https://doi.org/10.3758/BF03206103