Abstract
Using Case’s Neo-Piagetian theory, the cognitive and social development of the child in the second year of life is investigated. In a longitudinal repeated measures design, using cognitive and social tasks, 18 mother-infant pairs were studied in respect to the transition period from the first (sensorimotor) stage to the second (interrelational) stage. Results strongly support the prediction that a new stage of development is achieved between the ages of 18 and 22 months in both the cognitive and social domains. It is suggested that functioning in other domains such as language, affect, visual-spatial and fine and gross motor skills be examined to determine whether similar transition occurs in such areas.
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