Subjective rarefaction in illusory figures: the inadequacy of apparent lightness as an explanation.
Apparent rarefaction in subjective figures seems to violate the principle of size scaling. It has been claimed that this anomaly is due to a difference in illusory lightness which counteracts the expected effect of illusory depth. Qualitative evidence is presented that neither illusory lightness nor illusory depth have a relevant part in the phenomenon. An alternative account, in which contrast and size are shown to play major roles, is presented and discussed.
Bressan
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Dipartimento di Psicologia Generale, Università di Padova, Italy.
D003118:Color Perception; D003867:Depth Perception; D006801:Humans; D007088:Illusions; D009903:Optical Illusions; D010812:Physical Stimulation