Language acquisition device

The Language Acquisition Device (LAD) is a theoretical component of the individual's thought.[1]

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First proposed by Noam Chomsky in the 1960s, the LAD concept is an instinctive mental capacity which enables an infant to acquire and produce language. It is a component of the nativist theory of language. This theory asserts that humans are born with the instinct or "innate facility" for acquiring language. The main argument in favor of the LAD is the argument from the poverty of the stimulus, which argues that unless children have significant innate knowledge of grammar they would be unable to learn language as quickly as they do, given that they never have access to negative evidence and rarely received direct instruction in their first language.[2]

A summary explaining LAD by Chomsky states languages are infinite pertaining to the sequence of word forms (strings) and grammar. Then these word forms organize grammatically correct sequences of words that can be pooled over a limited lexicon of each independent language. So, LAD is tasked to select from the infinite grammars that is then correct for the language that is presented to an individual, for example, a child. However, Chomsky’s ideas lead to the problems such as, how can LAD pick which grammar is correct for a given language, the idea of poverty of negative evidence addressed by Brian MacWhinney, and innate universal grammar, error-free learning, to name a few.[3]

MacWhinney, focusing on poverty of negative evidence, argues that there is not enough evidence to support error-free learning and an existence of a universal grammar posed by Chomsky. This system, would be “predictive” if built, thus in doing so a set LAD would embody a universal grammar that is also set.[4]