Age changes In the Pernio and filled-space illusions

Abstract

A generalization about age changes in assimilation and contrast illusions was proposed. A version of the Ponzo illusion, which apparently provided an exception to the generalization, was analyzed into the classical Ponzo and the filled-space illusions, and these were administered to children ranging in age from 5 to 17 years. Both of these illusions were found to decline with age, thus contradicting the results of earlier investigations. © 1974 Psychonomic Society, Inc.