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Chapter 13 First language acquisition Description reflections Language acquisition is the process by which humans acquire the capacity to perceive and comprehend language, as well as to produce and use words and sentences to communicate. Language acquisition is one of the quintessential human traits, [1] because non-humans do not communicate by using language. [2] Language acquisition usually refers to first-language acquisition, which studies infants' acquisition of their native language. This is distinguished from second-language acquisition, which deals with the acquisition (in both children and adults) of additional languages. The capacity to successfully use language requires one to acquire a range of tools including phonology, morphology, syntax, semantics, and an extensive vocabulary. Language can be vocalized as in speech, or manual as in sign. Human language capacity is represented in the brain. Even though human language capacity is finite, one can say and understand an infinite number of sentences, which is based on a syntactic principle called recursion. In the chapter we learned to differentiate The evidence that suggests that each individual has three recursive mechanisms that allow sentences to go indeterminately. These three mechanisms are: relativization, complementation and coordination. On the other hand, there are actually two main guiding principles in the acquisition of the first language, that is, the perception of speech always precedes the production of speech and the system evolves little to Little by which a child learns a language is built one step at a time, beginning with the distinction between individual phonemes.