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AbstractAround the end of the first year of life, infants develop a social referencing ability – using emotional information from others to guide their own behavior. Much research on social referencing has focused on changes in behavior in response to emotional information. The present study was an investigation of the changes in neural responses that underlie social referencing behavior, reflected in event‐related potentials (ERPs). Twenty‐six 12‐month‐olds participated in a single‐session visit in which ERPs were recorded both immediately before and after a behavioral intervention in which infants' caregivers provided positive, negative or neutral information about each of three stimuli (ERP data available for n = 17). After the intervention, infants devoted more neural resources to processing negative versus neutral and positive information, as observed in early and late positive‐going components. Changes in neural responses from the pre‐ to post‐intervention recordings clarify this observation, indicating a sustained response in the negative and positive conditions, and a decrease in the neutral condition, suggesting an attenuation effect in the neutral condition. Further, infants who attended most to the objects in the behavioral intervention showed increased neural responses in the negative condition and decreased responses in the positive condition. Taken together, these findings suggest that infants' neural responses are differentially affected by positive, negative and neutral information. Furthermore, the findings highlight the importance of measuring the change in neural responses to better interpret post‐experience responses.

AbstractBy the time they enter preschool children have acquired extensive knowledge of gender stereotypes. There has been little work on their use of this knowledge to make inferences about behavior; there is virtually no information as to how the explicitness of gender‐category information influences the reliability of inferences. In two experiments we tested 3‐112‐year‐old children's recognition and use of less‐than‐explicit, yet highly reliable, cues to gender‐category membership: common proper names. In Experiment 1 children reliably associated feminine‐stereotyped names with pictures of girls and masculine‐stereotyped names with pictures of boys; they did not reliably associate gender‐neutral names with pictures of girls and boys. In Experiment 2 children used their knowledge of same‐gender‐category names to make predictions about the preferences of otherwise sex‐unspecified targets; they did not make reliable predictions when the targets were labeled with opposite‐gender‐category names. In contrast, when the targets were labeled with gendered common nouns ("girl" and "boy") performance was reliable and was not affected by match or mismatch between the sex of the child and the gender category of the target. The findings indicate differential patterns of development and application of gender‐category consistent versus gender‐category inconsistent knowledge.

Long‐term explicit memory is thought to involve a complex neural circuit including the medial temporal lobe, the medial diencephalon, the prefrontal cortex, and association cortices. When this memory system and associated neural circuitry develops is of great interest to developmental psychologists and developmental cognitive neuroscience researchers. In the present report, we provide evidence of a relation between behavioral and neurophysiological measures of long‐term explicit memory in 9‐month‐old infants. These measures provide converging evidence of the development of long‐term explicit memory at least by the end of the first year of life.

AbstractThe ability to recall contextual details associated with an event begins to develop in the first year of life, yet adult levels of recall are not reached until early adolescence. Dual‐process models of memory suggest that the distinct retrieval process that supports the recall of such contextual information is recollection. In the present investigation, we used both behavioral and electrophysiological measures to assess the development of memory for contextual details, as indexed by memory for temporal order, in early childhood. Results revealed age‐related improvements in memory for temporal order despite similar levels of memory for the individual items themselves. Furthermore, this pattern of recall was associated with specific components in the electrophysiological response. Consistent with electrophysiological research in adults, distributed, positive‐going activity late in the waveform was associated with increases in recall of contextual details and the development of recollective processes.

AbstractAlthough 9‐month‐old infants are capable of retaining temporally ordered information over long delays, this ability is relatively fragile. It may be possible to facilitate long‐term retention by allowing infants to imitate event sequences immediately after their presentation. The effects of imitation on immediate and delayed recognition and on long‐term recall were investigated using event‐related potentials (ERPs) and elicited imitation, respectively. Mnemonic facilitation resulting from the opportunity to imitate was apparent using both assessments. ERP assessments at immediate and delayed recognition tests suggested that infants who were allowed to imitate had stronger memory representations of familiar stimuli relative to infants who only viewed the presentation of the events. In addition, infants who were allowed to imitate evidenced higher levels of ordered recall after 1 month relative to infants who only watched the experimenter's demonstration. Therefore, imitation proved to have beneficial effects on explicit memory in 9½‐month‐olds, providing evidence of its effectiveness as a tool to augment mnemonic capabilities in infancy.