Research on the development of face recognition in infancy has shown that infants respond to faces as if they are special and recognize familiar faces early in development. Infants also show recognition and differential attachment to familiar people very early in development. We tested the hypothesis that infants' responses to familiar and unfamiliar faces differ at different ages. Specifically, we present data showing age-related changes in infants' brain responses to mother's face versus a stranger's face in children between 18 and 54 months of age. We propose that these changes are based on age-related differences in the perceived salience of the face of the primary caregiver versus strangers.Keywords face recognition; social behavior; attachment; stranger anxiety; event-related potentials Interest in relations between brain and behavioral development has grown substantially in recent years. Of special interest is the development of the brain basis of social behavior. Although researchers interested in the role of experience in brain development have proposed that experience can alter brain areas involved in social development (e.g., Greenough, Black, & Wallace, 1987), there are very little data that address this issue. Indeed, we still have little knowledge about the development of brain systems underlying the development of social behavior and cognition.
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NIH-PA Author ManuscriptWe describe age-related differences in the neural correlates of face recognition and suggest ways that these differences may be related to changes in social development that arise through the child's interaction with the environment. We examined the neural correlates of the response to the mother's versus a stranger's face throughout the toddler and preschool years. We sought to better understand the development of the recognition of familiar and unfamiliar faces during a period of great developmental change in a number of cognitive and social domains.Infants have an inherent interest in faces, which may play a pivotal role in the development of relationships with others and in the ability to recognize the emotional states and intentions of others. A substantial body of literature makes it clear that very young infants are able to discriminate familiar from unfamiliar faces. For example, behavioral measures such as looking time and habituation have shown that, from a few days of age, infants prefer to look at a familiar versus an unfamiliar face (e.g., Pascalis & de Schonen, 1994;Pascalis, de Schonen, Morton, Derulle, & Fabre-Grenet, 1995), imitate selected facial movements (Meltzoff & Moore, 1977, 1997, and by 6 weeks of age, differentially imitate familiar versus unfamiliar people (Meltzoff & Moore, 1992, 1998.Evidence from electrophysiological studies shows that by about 6 months of age infants exhibit differential brain activity to familiar faces versus unfamiliar faces, and that infants' patterns of brain activity can be influenced by how similar the un...