Abstract
Large proportions of the general population have frequently been reported to be stereoscopically anomalous. However, when we tested a large sample (103 subjects), we found all (with the exception of three truly stereoblind observers) to be able to initially detect depth in Julesz random dot stereograms within 2 min. Some subjects, however, were not able to detect depth when retested immediately with reversed disparity, but half of those were able to see depth on retesting a few days later. We conclude that stereoanomalies are much rarer than has previously been suggested and that any putative one-way (i.e., restricted to crossed or uncrossed disparity) deficiencies are actually due to strategy or sequence effects rather than to neural deficiencies.
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Patterson, R. E., & Fox, R. Informationprocessing in global stereopsis. Paper presented at the annual meeting of the Psychonomic Society, Philadelphia, November 1982.
References
Jones, R. Anomalies of disparity detection in the human visual system. Journal of Physiology, 1977, 264, 621–640.
Julesz, B. Foundations of cyclopean perception. Chicago: University of Chicago Press, 1971.
Richards, W. Stereopsis and stereoblindness. Experimental Brain Research, 1970, 10, 380–388.
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This research was supported by Office of Naval Research Contract N00014-81-C-0266 to the University of Michigan. Millicent Newhouse is the current (1981-1982) ONR Science Apprentice in the ISR Perception Lab; she is a senior at Ann Arbor Huron High School
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Newhouse, M., Uttal, W.R. Distribution of stereoanomalies in the general population. Bull. Psychon. Soc. 20, 48–50 (1982). https://doi.org/10.3758/BF03334799
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DOI: https://doi.org/10.3758/BF03334799