The behaviorist（行为主义论） Traditional behaviorists view language as behavior and believe that language learning is simply a matter of imitation and habit formation. Imitation Recognition Reinforcement
The critical period hypothesis
To acquire language is biologically linked to age. The hypothesis claims that there is an ideal time window to acquire language in a linguistically rich environment, after which further language acquisition becomes much more difficult and effortful.
The innatist view（语法天生主义论）
.According to the innatist view of language acquisition, human beings are biologically programmed for language. .The reason why chilt human have innate ability of learning a language, and this ability is determined by genetic factors.
10.4
Language environment
and
the critical period hypothesis
Different theories concerning child language acquisition
the behaviorist view 行为主义理论 the innatist view 语法积极天生主 义理论 the interactionist view 互动主义 理论
Interactionist view互动主义理论
The interactionist theory emphasizes the importance of the interaction between biological and social (nature and nurture) aspects of language acquisition. Despite the differences, one thing is certain is that language environment is essential in providing input for language acquisition, without which language acquisition seems impossible.