Abstract
Illusory depth in an outlined square and in an illusory square was assessed by requiring subjects to choose among phenomenological descriptions and to report the relative sizes of dots located inside and outside these squares. Contrary to previous suggestions, results obtained with the two measures were not mutually contradictory regarding depth and neither measure suggested that depth effects are less frequent in illusory figures.
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Parks, T.E. On the relative frequency of depth effects in real versus illusory figures. Perception & Psychophysics 42, 333–336 (1987). https://doi.org/10.3758/BF03203088
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DOI: https://doi.org/10.3758/BF03203088