Descriptor
| Age Differences | 1 |
| Cognitive Development | 1 |
| Handicapped Children | 1 |
| Mental Retardation | 1 |
| Perception Tests | 1 |
| Perceptual Development | 1 |
| Task Performance | 1 |
| Visual Perception | 1 |
Source
| Develop Psychol | 1 |
Author
| Spitz, Herman H. | 1 |
Publication Type
Education Level
Audience
Location
Laws, Policies, & Programs
Assessments and Surveys
What Works Clearinghouse Rating
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
