Final answer:
Henry's reactions at the zoo are best explained by attachment theory, which highlights the importance of social comfort and security for healthy development, as shown by Harlow's studies on rhesus monkeys.
Step-by-step explanation:
Henry's initial curiosity and his later fear and apprehension when primates at the zoo mimicked his behavior are best explained by attachment theory. This theory, substantiated by the work of psychologists such as Harry Harlow, John Bowlby, and Mary Ainsworth, emphasizes the importance of social comfort and security for healthy psychosocial development.
Harlow's experiments with rhesus monkeys, which demonstrated that monkeys preferred a soft, cloth surrogate mother over a wire one even though it did not provide food, underscores the need for contact comfort in establishing bonds that are critical to an individual's development. In Henry's situation, his response could be attributed to an inability to assimilate the unfamiliar behavior of the primates into an existing schema. Attachment to his parents provides comfort and security, and encountering mimicking behaviors from non-human primates might challenge his sense of safety, leading to distress.