Concept introduction
The case of Anna showed that her years of isolation made it hard for her to communicate and even smile. There is a critical period during which people, and monkeys (as shown by Harlow's research) must develop social and other skills. If that does not occur, the likelihood of developing these skills after the critical period is very low.
Explanation of Solution
Answer and explanation
The studies of isolated children like Anna, Isabelle, and Genie demonstrate that there is a critical period early in life during which people develop language, personality, and social skills. Each of these children had significant developmental delays from which they recovered to various levels. None of them were able to completely overcome the deficits of these early problems. Social experience, therefore, is crucial to normal development among children.
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