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Nelson, Keith E. – Merrill-Palmer Quarterly, 1974
Infants ranging in age from six months to eight months were shown repeated instances of real object movement-disappearance-reappearance. Results suggest that the key changes in early cognitive development rest primarily upon the infant's gradual adaptation of old responses through encounters with new events--rather than upon the acquisition of…
Descriptors: Concept Formation, Discrimination Learning, Feedback, Infant Behavior