Descriptor
| Age Differences | 1 |
| Cognitive Development | 1 |
| Cross Sectional Studies | 1 |
| Developmental Tasks | 1 |
| Infant Behavior | 1 |
| Longitudinal Studies | 1 |
| Object Permanence | 1 |
| Research Methodology | 1 |
Source
| Child Development | 1 |
Author
| Kramer, Judith A. | 1 |
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Peer reviewedAnd Others; Kramer, Judith A. – Child Development, 1975
An investigation of Piaget's theory of object concept development through a series of six tasks administered in a combined longitudinal/cross-sectional design (which incorporated a number of methodological controls). Subjects were 36 infants who received the six tasks during each of three testing sessions over a 6-month period. (Author/ED)
Descriptors: Age Differences, Cognitive Development, Cross Sectional Studies, Developmental Tasks
