| Abstract | 第1-8页 |
| 摘要 | 第8-10页 |
| List of Tables | 第10-11页 |
| List of Abbreviations | 第11-12页 |
| Chapter One Introduction | 第12-16页 |
| ·Research background | 第12-14页 |
| ·Aims and significance | 第14页 |
| ·Definition of the terms | 第14-15页 |
| ·Retention | 第14页 |
| ·Gain | 第14页 |
| ·Task | 第14-15页 |
| ·Involvement load | 第15页 |
| ·Thesis structure | 第15-16页 |
| Chapter Two Literature Review | 第16-28页 |
| ·Studies on intentional and incidental vocabulary acquisition | 第16-18页 |
| ·Studies on tasks and L2 incidental vocabulary acquisition | 第18-21页 |
| ·Studies on L2 vocabulary learning through listening tasks abroad | 第19页 |
| ·Studies on L2 vocabulary learning through listening tasks at home | 第19-21页 |
| ·Studies on Involvement Load Hypothesis and L2 IVA | 第21-22页 |
| ·Empirical studies on Involvement Load Hypothesis and L2 IVA through listening tasks | 第22-24页 |
| ·Other factors that may affect L2 incidental vocabulary learning | 第24-26页 |
| ·Textual factors that affect L2 incidental vocabulary learning | 第24-25页 |
| ·Word properties that affect L2 incidental vocabulary learning | 第25页 |
| ·Learner factors that affect L2 incidental vocabulary learning | 第25-26页 |
| ·Summary | 第26-28页 |
| Chapter Three Theoretical Framework | 第28-32页 |
| ·The birth of the Involvement Load Hypothesis | 第28页 |
| ·Components of the involvement construct | 第28-30页 |
| ·Task-induced involvement load | 第30-31页 |
| ·Assumption of the Involvement Load Hypothesis | 第31页 |
| ·Summary | 第31-32页 |
| Chapter Four Methodology | 第32-41页 |
| ·Research hypotheses | 第32页 |
| ·Operational definitions of the variables | 第32-33页 |
| ·Participants | 第33页 |
| ·Instruments | 第33-39页 |
| ·Listening materials selected for the experiment | 第33-34页 |
| ·Target words for testing and ways of scoring | 第34页 |
| ·Stimulus tasks | 第34-37页 |
| ·Task One | 第34-35页 |
| ·Task Two | 第35-36页 |
| ·The involvement index of the two tasks | 第36页 |
| ·Other factors considered in task design | 第36-37页 |
| ·Listening comprehension test and the way of scoring | 第37页 |
| ·Vocabulary size test and the way of scoring | 第37-38页 |
| ·Immediate and delayed posttests and the way of scoring | 第38页 |
| ·Questionnaire | 第38-39页 |
| ·Procedures | 第39-40页 |
| ·Pilot study | 第39页 |
| ·Main study | 第39-40页 |
| ·Delayed test and the questionnaire | 第40页 |
| ·Techniques for the statistical analyses | 第40-41页 |
| Chapter Five Results and Discussions | 第41-56页 |
| ·Results | 第41-50页 |
| ·Results of the immediate and delayed posttests | 第41-42页 |
| ·T-test results for the immediate and delayed retention tests between groups | 第42-43页 |
| ·T-test comparisons between the immediate and delayed tests within groups | 第43-44页 |
| ·Statistic analysis concerning subjects’listening comprehension, their vocabulary size and word retention performance | 第44-49页 |
| ·Correlations | 第44-46页 |
| ·Effect of subjects’vocabulary size on IVA | 第46-48页 |
| ·Effect of subjects’listening comprehension on IVA | 第48-49页 |
| ·Results of the questionnaire | 第49-50页 |
| ·Discussions | 第50-56页 |
| ·Tasks with different involvement index and IVA | 第50-52页 |
| ·Subjects’vocabulary size and IVA | 第52页 |
| ·Subjects’listening comprehension and IVA | 第52-54页 |
| ·Subjects’attitudes towards vocabulary learning exposed from the questionnaire | 第54-56页 |
| Chapter Six Conclusion | 第56-58页 |
| ·Major findings of the study | 第56-57页 |
| ·Implications and limitations | 第57-58页 |
| References | 第58-65页 |
| Appendixes | 第65-76页 |
| Appendix 1 | 第65-66页 |
| Appendix 2 | 第66-67页 |
| Appendix 3 | 第67-68页 |
| Appendix 4 | 第68-69页 |
| Appendix 5 | 第69-73页 |
| Appendix 6 | 第73-74页 |
| Appendix 7 | 第74-75页 |
| Appendix 8 | 第75-76页 |
| Acknowledgements | 第76页 |
