Reports two concurrent experiments which measured chicks' degree of imprinting to mechanical cohabitants and the relationship between preseparation behavior and reactions to the removal of the cohabitant. (JMB)

This article attempts to illustrate the value of a psychobiological approach to the study of a particular behavior; in this case, vocalization of infant primates following loss of the mother. (PCB)

This article outlines a strategy for studying early social relationships in relatively simple animal model systems. It describes some of the differences in approach between neuroscientists and human developmentalists in dealing with the same research problems. (BN)

Discusses ways in which Myron Hofer's work (1987), which draws on studies of rodents and primates, alters the traditional perspective on human attachment. Emphasizes the importance of the component of attachment that does not develop in explaining attachment in the first six months of life. (PCB)