Three experiments are presented which examine the ability of 10-month-old infants to search in a new hiding place. (Author)

This study of the stability of parent behaviors toward toddlers over a 3-week period used both aggregated and nonaggregated data. Comparison of stability correlations indicated higher stabilities for aggregated scores, with the level of stability increasing as scores from additional single sessions were aggregated. (PCB)

Results show that continuous stimulation reduced arousal level both behaviorally and physiologically, that this effect occurred quite rapidly, and that it endured relatively unchanged over time. (Author)

Study attempted to determine the viability of optimal level theory as it pertains to infant perceptual and cognitive development. (Authors)

In a naturalistic behavioral stdy, it was found that prematures have significantly more endogenous smiling than full-term newborns. (Authors)

Purpose of the study was to determine whether a name for a toy affects an infant's attentional preference for a toy and whether this process is related to the infant's concept of subject permanence. (Authors)

Development of object identity was studied within the framework of a hiding game that varied the objects themselves instead of their spatial positions. (Authors)

Authors conclude that social class differences in intellectual development or cognitive style are probably not present during the sensorimotor period. (Authors/MB)

A six-month-old infant who can remove a transparent cloth from his hand when it is covered after he grasps a toy may not be able to remove an opaque cover. Alternative interpretations of the phenomenon, that is, degree of bimanual coordination and focus of attention, are discussed. (Author/MB)

Data from infants unable to complete experimental sessions were compared to those for whom there were complete data. Results suggest that the elimination of large numbers of infants may have a potentially biasing effect on reported data. (Authors)

This project hoped to specify the role of early, mother-infant separation in determining later maternal behavior. Clinically, the results suggest that such a separation should be avoided whenever possible and should be minimized when separation is unavoidable. (Authors)

Demonstrated that time sampling is inaccurate for estimating durations or frequencies of behaviors. Also concluded that (1) individual or group differences can change depending on whether time sampling or continuous sampling is used; and (2) error rates are high when bout lengths of behaviors are short or when interval length is long. (BC)

Results are discussed in terms of cognitive growth, the psychoanalytic notion of ambivalence, the role of stimulus context in eliciting laughter or fear, and a possible adaptive, stimulus-maintaining function of laughter. (Authors)