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Spitz, Herman H.; And Others – Develop Psychol, 1970
Contrary to Piaget's predictions, adolescent retardates and 9-year-old normals were more susceptible to the Oppel-Kundt Illusion than high school sophomores and adults. No group differences were found on the Poggendorf Illusion. (MH)
Descriptors: Age Differences, Cognitive Development, Handicapped Children, Mental Retardation
Download full textRodenborn, Leo V., Jr. – 1972
The project's purpose was to determine whether attention to the task during testing was a confounding variable in measures of visual perception ability. Samples of 30 perceptually handicapped (PH) and 30 normal subjects (N) were randomly selected from children so classified on the Frostig DTVP, providing they had IQ scores between 85 and 115 on…
Descriptors: Analysis of Variance, Attention, Factor Analysis, Handicapped Children
