Several Considerations of the Critical Period Hypothesis

摘要

The existence of Critical Period Hypothesis in language acquisition is an important and controversial issue. This thesis reviews the scholars who support, suspect or oppose the existence of CPH and further explored from the effective factors of lateral-ization, cognitive ability, social basis and affective factors. We can not conclude that there exists a critical period which guarantee the success or failure of language acquisition. All factors function together in the process of language learning.