Abstract
Using the viewing box from a 2-field tachistoscope, feathers-arrows from 1 field were superimposed upon line-pairs from the other field to construct the Muller-Lyer illusion. 6 Os were tested for the illusory effects under 4 conditions of feather-arrow detectability: (a) d′=O, (no luminance); (b) d′=.42; (c) d′=1.00 and (d) d′=3.7. The length differences of lines of any given pair were a in., 1/64 in., 2/64 in., or 6/64 in. The illusion effect was observed when the feather-arrow d’ equaled 3.7. No significant nor suggestive illusion effects were found for the other feather-arrow detectability conditions.
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This investigation was supported by Public Health Service Research Grant MH-1206 and a Public Health Service Research Career Program Award K6-MH-22, 014.
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Trimble, R., Eriksen, C.W. “Subliminal cues” and the Miiller-type illusion. Perception & Psychophysics 1, 401–404 (1966). https://doi.org/10.3758/BF03207418
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DOI: https://doi.org/10.3758/BF03207418