| 摘要 | 第1-6页 |
| Abstract | 第6-12页 |
| Chapter 1 Introduction | 第12-21页 |
| ·The Problem | 第12-15页 |
| ·Brief Introduction of the Studied Matter | 第12-13页 |
| ·Former Studies on Language Variation | 第13-14页 |
| ·The Shortcomings of Former Studies | 第14-15页 |
| ·Research Questions and Objectives | 第15-18页 |
| ·Research Questions | 第15-17页 |
| ·Objectives | 第17-18页 |
| ·Types of Research and Hypotheses | 第18-21页 |
| ·Types of Research | 第18-19页 |
| ·Hypothesis | 第19-21页 |
| Chapter 2 Theoretical Framework and Related Literature | 第21-37页 |
| ·Theoretical Framework | 第21-29页 |
| ·Introduction | 第21页 |
| ·Theories of Mental Models | 第21-28页 |
| ·Theories of Meme | 第28-29页 |
| ·Related Literature of Language Variation | 第29-37页 |
| ·August Schleicher's Family Tree Theory | 第29-30页 |
| ·Wave Theory by J. Schmidt | 第30-31页 |
| ·Later Development of Theory of Language Variation | 第31-32页 |
| ·Contemporary Theories of Language Variation | 第32-34页 |
| ·Theories of Language Variation by Sociolinguists | 第34-35页 |
| ·Language Variation Studies in China | 第35-37页 |
| Chapter 3 Method | 第37-47页 |
| ·Introduction | 第37页 |
| ·Participants | 第37页 |
| ·Materials | 第37-41页 |
| ·Material Collected on Phonological Variation | 第38-39页 |
| ·Material Collected on Semantic Variation | 第39-41页 |
| ·Material Collected on Grammatical Variation | 第41页 |
| ·Design and Data Analysis | 第41-45页 |
| ·The Design of the Questionnaire | 第41-43页 |
| ·Data Analysis | 第43-45页 |
| ·Procedure | 第45-47页 |
| Chapter 4 Results | 第47-59页 |
| ·Introduction | 第47页 |
| ·Mental Models of Language Variation | 第47-49页 |
| ·Analysis of the Materials on Phonological Variation | 第49-52页 |
| ·Analysis of the Material on Semantic Variation | 第52-53页 |
| ·Analysis of Material on Grammatical Variation | 第53-57页 |
| ·Analysis of the Transmission of Language Variation | 第57-59页 |
| Chapter 5 Discussion | 第59-63页 |
| ·Introduction | 第59页 |
| ·Theoretical Significance of Cognitive Study of language Variation | 第59-60页 |
| ·Practical Significance of Cognitive Study of language Variation | 第60-61页 |
| ·Problems and Difficulties Encountered | 第61-63页 |
| Chapter 6 Conclusion | 第63-68页 |
| ·Summary | 第63-65页 |
| ·Validity and Reliability | 第65页 |
| ·Limitations and Further Research | 第65-68页 |
| References | 第68-71页 |
| Published Paper | 第71-72页 |
| Acknowledgements | 第72页 |
