THE SMILING RESPONSE. II: VISUAL DISCRIMINATION AND THE ONSET OF DEPTH PERCEPTION

Abstract
The beginning of depth perception in 23 infants followed longitudinally was found to be between 2 months and 20 days and 3 months. A technique was used comparing the degree of the smiling response to the human face with such a response to a 2 dimensional life-size color photograph of the face. The age of discrimination between the 2 stimuli was considered to be the age at which the infants could perceive depth. In addition to smiling, the infants indicated that a differentiation between the 2 stimuli had been made by vocalizing more to the human face, and turning away more frequently from it. The implications of these findings, as well as the I.R.M. aspects of the smiling response, and the importance of the face of the adult to the psychological development of the infant, are discussed.

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