Bisecting the Ponzo illusion
- PMID: 1178411
- DOI: 10.2466/pms.1975.41.1.225
Bisecting the Ponzo illusion
Abstract
A modification of the Ponzo illusion, in which the judged lines are centered in different sized obliques, was presented to matched normal and mentally retarded males (ns = 8) under conditions of equal and unequal retinal sizes. Magnitude of illusion was affected by IQ (WISC) and by physical proximity rather than retinal contour. The results seem to imply a central rather than peripheral explanation for the illusion.
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