We examine behavioral and physiological aspects of primate emotional attach
ments in the context of four relationships: infant-to-parent, parent-to-inf
ant, and adult male-to-female and adult female-to-male in a monogamous New
World species. Emotional attachments in each of these relationships show st
riking similarities at a basic functional level. The nature of these simila
rities suggests that they are produced by the same psychoneuroendocrine cor
e, which appears to be present in all mammals. We also consider the develop
ment of each of kind of attachment. In contrast to fundamental similarities
in the expression of attachment, their development in each case appears to
be based on distinct, species-typical dispositions and constraints. (C) 19
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