Studying normal infant development is a challenge for cognitive scientists in general and for neuroscientists in particular because: (1) physiological indices of infant cognition are generally noisy and technically difficult to obtain; and (2) interindividual variability and a paucity of established results make data interpretation very complex,…

Background: The present study was designed to investigate the association between visual exploratory behaviour in early infancy, novelty seeking in adolescence, and the dopamine D4 receptor (DRD4) genotype. Methods: Visual attention was measured in 232 three-month-old infants (114 males, 118 females) from a prospective longitudinal study using a…

This annual report presents several articles related to the work of the Clinical Center for Child Development at Hokkaido University in Sapporo, Japan. The articles are: (1) "Joint Attention as a System Property of the Infant-Caregiver Interaction System"(Tsuneda Miho and Shing-Jen Chen); (2) "Age-Related Change in Japanese Maternal…

Explored infants' responses to live and replay interactions with mothers and their own images. Found that to their mothers, infants decreased attention, length of first gazes, and smiling from initial live feedback to replay, and that responses to subsequent live feedback generally remained suppressed. Also found that infants did not show a…

Examined contributions of cognitive processing speed, short-term memory capacity, and attention to infant visual recognition memory. Found that infants who showed better attention and faster processing had better recognition memory. Contributions of attention and processing speed were independent of one another and similar at all ages studied--5,…

Compares activities related to maternal organization of infant attention toward mother and the environment in Japanese and American mother-child dyads. Results reveal that the two cultures have both similar activity and interaction patterns and culture-specific patterns. (Author/BB)

Three experiments assessed the intersensory redundancy hypothesis in early infancy. Findings indicated that habituation to a bimodal rhythm resulted in discrimination of a novel rhythm, whereas habituation to the same rhythm presented unimodally resulted in no evidence of discrimination. Temporal synchrony between the bimodal auditory and visual…

This paper presents a study of the looking and looking away or gaze alternation behavior of both full term and preterm infants in the presence of varying degrees of facial animation. The faces used in the study included, in increasing order of animation, a Raggedy Ann doll's face, a moving and talking doll's face, a mother's less animated face…

Examined arousal regulation as a function of levels of prenatal cocaine exposure in 4-month-olds, using a "still face" procedure. Found that, independent of several other factors, a greater percentage of heavily cocaine-exposed infants, compared to unexposed infants, showed less enjoyment during "en face" play with their mothers and continued to…

Compared behavior of 52 Costa Rican 12- to 23-month-olds with iron-deficiency anemia to that of 139 infants with better iron status. Found that iron-deficient infants maintained closer contact with caregivers; showed less pleasure and playfulness; were more wary, hesitant, and easily tired; made fewer attempts at test items; and attended less to…

This study examines the relationship between mother-infant behavior and the infant's performance on perceptual-cognitive tasks as a function of the infant's sex. A total of 189 12-week-old infants and their mothers were observed in their homes during 2 hours of infant awake time. In addition, the Mental Development Index (MDI) of the Bayley Scales…

The purpose of this study was to investigate class differences in the responses of infants to tape recordings of mothers' and strangers' voices. Subjects were 10-month-old first-born Caucasian girls, 30 from middle class families and 30 from working class families. Stimuli presented through a speaker placed in front of the infant consisted of…

Function of attention in infants is explored. Assuming (1) that infants respond differently to novel situations than to familiar ones; (2) that the infant's pattern of response is a partial reflection of the process of acquiring a perceptual memory of the stimulus, and (3) that sex differences may occur in the rate of habituation, 120 infants…

This study compared infants born to narcotic addicted mothers with infants born to nonaddicted mothers and described the potential of an intervention program. Infants of five addicted women were matched with infants of five nonaddicted women on the basis of age and socioeconomic class of the mothers and on the basis of gestational ages, birth…

The effects of low, full (normal) and high birthweights on the broad range of neonatal behaviors measured by the Brazelton Neonatal Assessment Scale were investigated in a study which also attempted to replicate results of the authors' earlier study of the Brazelton Scale. Data from the original sample of 52 infants were included in the later…