"Despite this success, American advocates of the natural paradigm managed to fend off European structuralism by making its own modifications of the model.
In 1946, Zellig Harris introduced transformational generative grammar which excluded semantics and placed the direct object into the verb phrase, following Wundt's psychological concept, as advocated in American linguistics by Leonard Bloomfield.
Harris's student Noam Chomsky argued for the cognitive essence of linguistic structures, eventually giving the explanation that they were caused by a random genetic mutation in humans."
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