| Introduction | 第6-9页 |
| Chapter1 Investigation and Results of Sampling Groups of Chinese Non-English Majors | 第9-30页 |
| 1.1 Purpose of investigation | 第9-13页 |
| 1.2 Investigation | 第13-17页 |
| 1.2.1 Subjects | 第13-15页 |
| 1.2.2 College English Test Band | 第15-16页 |
| 1.2.3 Questionnaire | 第16-17页 |
| 1.2.4 Statistical study | 第17页 |
| 1.3 Results | 第17-30页 |
| 1.3.1 Samples | 第17-18页 |
| 1.3.2 Age of learning distribution in class intervals | 第18-22页 |
| 1.3.3 Relationship between early exposure to English and attainment | 第22-24页 |
| 1.3.4 Subjects’ attitudes towards and experiences of English learning at different ages | 第24-26页 |
| 1.3.5 Relationship between self-reported English learning aspects and optimal age | 第26-27页 |
| 1.3.6 Stagnation period of English learning | 第27页 |
| 1.3.7 Summary | 第27-30页 |
| Chapter 2 Explanations of the CPH from an Aspect of Brain-Language Relationship | 第30-53页 |
| 2.1 The development of lateralization and the critical age for language Acquisition | 第31-34页 |
| 2.2 Cerebral language-functional specification and the critical age for 1 anguage acquisition | 第34-38页 |
| 2.3 Adult aphasia and localization of language functions | 第38-41页 |
| 2.4 Childhood aphasia and cerebral plasticity | 第41-47页 |
| 2.5 Linguistic significance of split-brain subjects | 第47-50页 |
| 2.6 Right hemisphere participation in language acquisition | 第50-53页 |
| Chapter 3 Evidence from Bilinguals Supporting the CPH | 第53-67页 |
| 3.1 Lateral dominance for language in bilinguals | 第53-58页 |
| 3.2 Different cortical areas associated with L1 and L | 第58-60页 |
| 3.3 The role of the right cerebral hemisphere in utterances of bilinguals | 第60-63页 |
| 3.4 Functional neural subsystems in second language acquisition differently affected by age of learning | 第63-67页 |
| Conclusion | 第67-70页 |
| References | 第70-75页 |
| Appendix | 第75-78页 |
| Abstract (in English) | 第78页 |
| Abstract (in Chinese) | 第83-85页 |
