What did Noam Chomsky mean by linguistic competence?

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In the context of his work in linguistics, Noam Chomsky defined linguistic competence as the underlying, creative mental capacity that allows a speaker to understand and produce language.1

Chomsky distinguished this concept from performance, which refers to the actual, observable utterances a person produces. While performance can be influenced by external factors, competence represents the speaker's internalized knowledge of the grammatical rules and formal principles of their language.12

Key aspects of this distinction include:

  • Mentalistic Approach: Chomsky argued that linguistics should focus on this internal competence—the "creative" ability of the speaker—rather than merely cataloging the surface-level data of actual speech.1
  • Generative Capacity: Competence involves a system of rules that enables individuals to construct and understand an infinite number of sentences, many of which they may have never encountered before.2
  • Innate Endowment: Chomsky posited that this competence is rooted in an innate language faculty, which provides the formal structure necessary for children to acquire language with remarkable speed and ease.32