Abstract
Demand characteristics were studied in a simple situation in which observers made size and distance estimates of stimuli presented on a two-dimensional linear perspective drawing. Half the Ss were asked questions stressing phenomenal report: The other half were asked the same questions preceded by instructions stressing the objective nature of the stimulus configuration but requesting, nonetheless, phenomenal report. Instructions resulted in a significantly greater perspective size illusion but did not affect the distance estimates. No meaningful correlations between size and distance estimates were found.
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This research was supported by grant number 9425-19 from the Defense Research Board of Canada.
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Hayes, C.J.A., King, W.L. Two types of phenomenal instructions for size and distance judgments of objects presented on a two-dimensional plane. Perception & Psychophysics 2, 556–558 (1967). https://doi.org/10.3758/BF03210266
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DOI: https://doi.org/10.3758/BF03210266