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David Ausubel

Language acquisition is the process in which cognitive structures are constantly created and restructured to consolidate knowledge.

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Lev Vygotsky

Language acquisition is conditioned by social interaction and environmental aspects, leading to conditionate the actual and the potential level of development of the subject.

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Jean Piaget

Language acquisition is developed as the subject matures, learning the language that is ready for, by assimilation and accomodation. The four stages: the sensori-motor stage, the preoperational stage, the concrete operational stage and the formal operational stage.

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Noah Chomsky

Language acquisition is a construction between biological aspects, like innate principles or universal grammar, and environmental aspects, like parameters or regional and social dialect.

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Burrhus Skinner

Language acquisition is an accumulation of stimuli and responses, and it is consolidated thanks to reinforcements, rewards and punishments.