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Chomsky's theory involved language and it stated that there are some aspects of language that are present at birth that can be used across multiple languages.
Source:
Stanborough, Rebecca Joy. "Are We Born Ready To Learn Language? Chomsky Theory Says Yes". Healthline, 2016, https://www.healthline.com/health/childrens-health/chomsky-theory#innate-skill. -
In his book Language and Mind, he explores the idea of universal grammar. This theory of universal grammar basically means that all languages have something in common when it is broken down to a basic linguistic level.
Source:
Pepperell, N. "Chomsky’s “Language And Mind”". Rough Theory, 2006, https://roughtheory.org/2006/10/30/chomskys-language-and-mind/. -
This theory was proposed that children do have a naturally occurring mechanism within the brain to assist with knowing a language. The human mind has the capability to learn grammar/language with very little input. (Vid: https://www.youtube.com/watch?v=xfiHd6DyuTU)
Source:
"Universal Grammar (UG) – World Englishes". Worldenglishes.Lmc.Gatech.Edu, https://worldenglishes.lmc.gatech.edu/universal-grammar-ug/#:~:text=Universal%20Grammar%20(UG)%20is%20a,that%20helps%20humans%20acquire%20language. -
This book details why Chomsky believes that it is important to study linguistics when looking into the study of the human mind.
Source:
Liu, Ming. "20Th WCP: Chomsky And Knowledge Of Language". Bu.Edu, https://www.bu.edu/wcp/Papers/Lang/LangLiu2.htm.