theories of language
Innate Knowledge
Plato
Locke and Tabula rasa
John Locke
Descartes and Cartesian Linguistics
René Descartes
Krashen and the monitor model and hypothesis
Stephen Krashen
The Acquisition-learning Hypothesis
The Input Hypothesis
The monitor Hypothesis
The Natural Order Hypothesis
The affective Filter Hypothesis: stress inhibits learning.
Universal grammar Theory by Noam Chomsky
Noam Chomsky