Attempts to clarify the meaning of differentiation in the Piagetian concept of object permanence. (BD)

The role of memory factors in the vowel discrimination of normal and at-risk 8-week-old infants was examined by studying the categorical versus continuous discrimination of very brief vowels in a nonnutritive sucking paradigm. Discrimination of the silent delay interval between the last familiar and the first novel stimulus was also examined.…

A contextual history of the early word use of 2 children during the first year of language was compiled from 28 hours of videotaped mother-child interaction. (Author/JMB)

Reaching and retrieving, with and without visual feedback of the hand, were observed in 50 infants ranging in age from 2 1/2 to 6 1/2 months. While failure to see the hand did not completely inhibit reaching and retrieving, it did reduce reaching and retrieving for infants 5 1/2 months and older. (Author/JMB)

Twenty infants were observed interacting with their mothers and fathers at home when they were 7, 8, 12, and 13 months of age. No parental preference was found in the infants' attachment behaviors. Differences were found in the infants' affiliative behaviors, in their responses to parental play, and in situations in which they were held by…

The use and function of imitation were examined for seven children in the early syntactic period of language acquisition, from 1-3 to 1-5 years old. (Author/SBH)

A factor analysis was performed on the behavioral items of the Brazelton Neonatal Assessment Scale for an urban population of 328 newborns. (Author/JMB)

The home environments of 74 infants were assessed when the infants were 6 and 24 months old. At three years of age their language development was measured. Results demonstrated that it is possible to specify some of the parameters of early experience related to certain aspects of language development. (Author/JMB)

This study tested Piaget's explanation of infants' perseverative error in manual search by comparing searches when the object was (1) hidden, (2) covered but visible, and (3) uncovered. Errors occurred under all three conditions, with conflict at a maximum when the object was hidden. (Author/JMB)

Three experiments examined the visual attentiveness of full-term vs. premature infants. (SB)

The study examined the classification scheme of the Ainsworth Strange Situation measure of attachment security with 44 insecurely attached 13-month olds from a high-social-risk sample. Results supported the existence of an additional category of infants whose attachment behavior was "avoidant/ambivalent" and whose families were…