Heart rate-defined phases of attention, look duration, and infant performance in the paired-comparison paradigm.

Four-month-old infants (N = 68) were tested in a paired-comparison familiarization-novelty recognition task in which the length of choice trials was systematically manipulated. Peak look duration during pretest and familiarization periods significantly predicted a dichotomous measure of recognition performance, but recognition was unaffected by choice-trial length. Heart rate (HR) was simultaneously assessed during the task, and the amount of time infants spent in various HR-defined phases of attention was assessed. Longer durations of looking during pretest and familiarization were significantly associated with more time spent in both sustained attention (SA) and attention termination (AT). Of these two variables, only individual differences in AT accounted for significant variance in recognition memory performance. A final analysis addressed the possibility that individual differences in AT mediated the relation between look duration and recognition performance. These findings provide support for the hypothesis that individual differences in the disengagement of attention underlie the relation between look duration and cognitive performance in early to midinfancy.

Remembering and understanding: the effects of changes in underlying knowledge on children's recollections.

This study was designed to explore the influence of changes in children's knowledge on earlier constructed memories. Kindergartners' (N = 102) recall of a series of stories was examined as a function of their interpersonal knowledge about the main story character. Children's knowledge about the protagonist was manipulated prior to presentation of the stories, and the effects of their impressions on story recall were examined. A change in some of the children's impressions was then promoted, and the impact of this second knowledge manipulation on recall of previously heard stories was assessed. The results indicated that children's story recall was affected by their prior impressions. Moreover, following the second knowledge manipulation, children revised their story reports in ways that were consistent with their newly acquired impressions, which suggests that they had reconstructed their memories of previously heard stories. These findings provide evidence for both prospective and retrospective effects of knowledge on memory.

Acting out the details of a pediatric check-up: the impact of interview condition and behavioral style on children's memory reports.

This investigation was designed to determine whether an enactment interview condition involving a doll and props, in contrast to a verbal interview, would enhance 3- and 5-year-olds' (N = 62) recall of a pediatric examination. An additional aim was to explore the influence of behavioral styles and language skills on children's performance, and the extent to which these relations varied by age and interview condition. Both 1- and 6-weeks following their check-ups, the children in the enactment condition, particularly the 3-year-olds, provided more spontaneous, elaborate reports than did those assessed with a verbal protocol. Nonetheless, enactment also resulted in increased errors by the 3-year-olds at the first interview, and by children in both age groups after the 6-week delay. The age and interview condition effects, however, were moderated by the children's behavioral characteristics. Among the younger children, a measure of manageability predicted performance in the enactment setting, whereas an indicator of persistence was associated with recall in the verbal condition. The results have implications for an understanding of children's memory of events and of their ability to provide testimony in legal settings.