Abstract
The retinal disparities in stereograms where the vertical alignment of pairs of homologous points in one eye differs from that in the other eye were found to be more effective than disparities that do not involve that kind of binocular difference. The presence of such “transverse disparities” was found to shorten the time elapsed until perceived depth was reported in four instances, in two simple stereogram pairs and in two different pairs of random dot pattern stereograms. In an experiment where binocular parallax was in conflict with an effect of past experience, the presence of transverse disparities caused binocular parallax to prevail. The presumption that the amount of perceived depth depends only on the amount of disparity (provided distances from the eyes are unchanged) and not on the configuration in which it manifests itself was found not to hold in stereograms containing transverse disparities.
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This work was supported by Grant 25,000X from the National Science Foundation to Swarthmore College, Hans Wallach, principal investigator.
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Wallach, H., Bacon, J. Two forms of retinal disparity. Perception & Psychophysics 19, 375–382 (1976). https://doi.org/10.3758/BF03199396
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DOI: https://doi.org/10.3758/BF03199396