A comparison of mental retardates and normals on the rotating trapezoidal window illusion.

1 May 1964

journal article
Published by American Psychological Association (APA) in The Journal of Abnormal and Social Psychology

Vol. 68 (5) , 574-578
https://doi.org/10.1037/h0042385

Abstract

56 high-grade institutionalized adolescent retardates and 56 normals of equated CA were, after training, split into 4 groups: Groups I and II observed a rotating trapezoidal window monocularly and binocularly, respectively; Groups III and IV observed a rotating trapezoidal shape, which had no windows cut out or shadows painted on it, monocularly and binocularly, respectively. Analysis of variance shows that visual conditions and stimuli are significant, but groups are not. The finding that retardates do not differ from normals on a reduced-cue ("experiential") illusion, contrasts with previous findings that they differ on full-cue ("physiological") illusions. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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