Four studies involving 40 pigtail monkeys are described in which relatively short separation experiences in infancy were associated with evidence of persistent changes in social behavioral function (less sociability, fewer close friends) and immunological function (suppression of lymphocyte proliferation) up to 6 years later. (Author/JDD)

Numerous studies have demonstrated predictive links between children's attachment relationships with parents and teachers and their success in the social contexts of child care and school. This body of research underlines the importance of children's ability to establish positive relationships with adults and to effectively use these adults to…