A comparison of retardates and normals on the Poggendorff and Oppel-Kundt illusions

Tested 28 adolescent retardates, 28 4th graders, and 28 high school sophomores on the Poggendorff illusion. The same Ss, plus 28 adults, were tested on the Oppel-Kundt illusion. No group differences were found on the Poggendorff illusion. On the Oppel-Kundt illusion, adolescent retardates were as su...

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Bibliographic Details
Published in:Developmental psychology 1970-07, Vol.3 (1), p.58-65
Main Authors: Spitz, Herman H, Goettler, Diane R, Diveley, Sally L
Format: Article
Language:English
Subjects:
Age Differences
Childhood Development
Human
Illusions (Perception)
Intellectual Development Disorder
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Summary:Tested 28 adolescent retardates, 28 4th graders, and 28 high school sophomores on the Poggendorff illusion. The same Ss, plus 28 adults, were tested on the Oppel-Kundt illusion. No group differences were found on the Poggendorff illusion. On the Oppel-Kundt illusion, adolescent retardates were as susceptible as 9-yr-old normals, but both groups exhibited a larger illusory effect than normal 15-yr-olds and normal adults, who did not differ from each other. Results are contrary to previous findings and do not support Piaget's predictions. (15 ref.)
ISSN:0012-1649
1939-0599
DOI:10.1037/h0029440