What is the strongest evidence in favor of a sensitive...

Key Concepts

Sensitive Period Hypothesis

The sensitive period hypothesis posits that there is a specific developmental window during which the human brain is particularly receptive to language learning, leading to more effective acquisition and more native-like proficiency when language exposure occurs during early childhood. This concept is central in discussions of language acquisition and is supported by comparative studies of early and late language learners.

Age of Acquisition Effects

Age of acquisition effects describe the observable differences in language proficiency and neural processing that emerge when a language is learned at different stages of life. Empirical evidence shows that individuals who begin learning a language early in life are more likely to attain native-like fluency, while those who start later often face persistent challenges in pronunciation and grammar, thereby supporting the existence of a sensitive period for language learning.

Neurological Plasticity

Neurological plasticity is the brain's ability to adapt and reorganize itself in response to new experiences, including language learning. During early childhood, heightened plasticity facilitates the efficient formation of neural networks dedicated to language processing, which diminishes as the brain matures. This decrease in plasticity with age is a key biological factor underpinning the sensitive period hypothesis.

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