Critical Period

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Critical Period and Language Acquisition
Part of the reason why Genie's case fascinated psychologists and linguists so deeply was that it presented a unique opportunity to study a hotly contested debate about language development. Nativists believe that the capacity for language is innate, while empiricists suggest that it is environmental variables that play a key role. Essentially, it boils down to the age-old nature versus nurture debate. Do genetics or environment play a greater role in the development of language? Nativist Noam Chomsky suggested that the acquisition of language could not be fully explained by learning alone. Instead, he proposed that children are born with a language acquisition device (LAD), an innate ability to understand the principles of language. Once exposed to language, the LAD allows children to learn the language at a remarkable pace. Linguist Eric Lenneberg suggests that like many other human behaviors, the ability to acquire language is subject to what are known as critical periods. A critical period is a limited span of time during which an organism is sensitive to external stimuli and capable of acquiring certain skills. According to Lenneberg, the critical period for language acquisition lasts until around age 12. After the onset of puberty, he argued, the organization of the brain becomes set and no longer able to learn and utilize language in a fully functional manner. Genie's case presented researchers with a unique opportunity. If given an enriched learning environment, could she overcome her deprived childhood and learn language even though she had missed the critical period? If she could, it would suggest that the critical period hypothesis of language development was wrong. If she could not, it would indicate that Lenneberg's theory was correct. Genie's Language Progress

Despite scoring at the level of a one-year-old upon her initial assessment, Genie quickly began adding new words to her vocabulary. She started by...
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