Final answer:
The research by Margaret and Harry Harlow demonstrated the importance of attachment and comfort for infant rhesus monkeys. This research showed the necessity of early social contact for healthy development.
Step-by-step explanation:
The research by Margaret and Harry Harlow demonstrated the importance for attachment and comfort in infant rhesus monkeys. The Harlows conducted a series of experiments where they studied monkeys raised under two types of surrogate mothering circumstances: a mesh and wire sculpture, or a soft terrycloth 'mother.' The monkeys systematically preferred the company of the soft terrycloth substitute mother, demonstrating that social comfort was of greater value than food. This research showed the necessity of early social contact for healthy development in rhesus monkeys and highlighted the importance of attachment and comfort.