The purpose of this research was to assess the infant's abilities to make successive discriminations in the size of a figure. The subjects were 90 10-month-old infants. (Author/MP)

The reactions of 38 infants to two social stimuli (talking and smiling) as well as a nonsocial stimulus (a rotating musical mobile) were observed longitudinally when the infants were 4-, 12- and 20-weeks-old. (CM)

Reports a semilongitudinal study which measured the respiratory activity during crying of 10 normal infants aged two days to eight months. (BD/BR)

Examines the ability of infants at various age levels between three and nine months to discriminate between their mother and a stranger, and relates such ability to the infants' developmental quotient at age nine months. (Author/MP)

Reports on a strategy of continuous measurement of the frequency of the same infant behavior over time, which was applied to measuring infant development in the prone position, namely, chin lifting, chest lifting, and a creeping response. (BD/BR)

Summary scores for behaviors rated on Bayley's Infant Behavior Record were obtained by summing sequential ratings for same-sex twins participating in a longitudinal study. Composite scores were calculated for two behavioral clusters - one composed of behaviors related to primary cognitions and the other of behaviors related to extraversion.…

Results of two studies were consistent with the view that 3-month-old infants perceive movement in depth during their own movement. They can move to avoid a surface just prior to contacting it. (Author/RH)

Twenty-eight 10-month-old infants were observed by two independent teams, one measuring activity in the home situation and one measuring attachment behaviors in a videotaped standard laboratory sequence. (MS)

The effect of four social learning conditions on early language acquisition was explored, along with comparisons between learning whole words and learning the component sounds of the words. Subjects were 20 infants aged 9 to 15 months. (MS)

Selected vocal and gestural imitation items were presented to twenty-four 8-, 14- and 20-month-old boys and girls in an elicited task situation. Both vocal and gestural imitation increased with age, although for each age group there was significantly more gestural than vocal imitation. (BD)

The production and comprehension of pointing and their developmental relationship in the young child was examined in a study of 36 male and female 9- to 14-month-old infants. (CM)