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Studies with Feral and Isolated Children:

Genie Case Study: One of the most famous cases supporting the CPH is that of Genie, a girl who was severely neglected and isolated during childhood.

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Evidence Supporting CPH

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4. Semantics : The CPH suggests that children are particularly adept at grasping the semantic nuances of a language during the critical period, acquiring vocabulary and understanding contextual meanings more readily than adults.

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3. Syntax : . According to the CPH, children have a heightened ability to internalize the syntactic structures of a language during the critical period, enabling them to produce grammatically correct sentences with relative ease.

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2.Morphology : During the critical period, language learners demonstrate a capacity for acquiring morphological rules and inflectional patterns, allowing them to form words and modify their meanings appropriately.

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1. Phonology: The CPH suggests that language learners are most adept at acquiring the sounds and phonological patterns of a language during the critical period.

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Linguistic Development

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Biological Basis.

Brain Plasticity: One of the key concepts supporting the CPH is brain plasticity ,which refers to the brain's ability to reorganize itself by forming new neural connections throughout life.

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The Critical Period Hypothesis (CPH) is a theory in linguistics that suggests there is a biologically determined period during childhood when language acquisition is optimal.

Typically ending around puberty, during which individuals are most receptive to learning languages and can achieve native-like proficiency more easily than at any other stage of development.

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Eric Lenneberg first proposed the Critical Period Hypothesis in his book "Biological Foundations of Language" in 1967. Lenneberg argued that there is a critical period for language acquisition, during which the brain is particularly flexible and adaptive to linguistic input.