臺灣博碩士論文加值系統

本研究試圖以腦波功率指標及腦波事件關聯電位之P300成份波，來評估視覺顯示終端機(VDT)作業所造成之心智負荷。視覺顯示終端機作業，係使用電腦完成60分鐘之心算及120分鐘之資料輸入，量測期間包括：作業前(BT)、立即於作業後(AT)和作業後60分(60-min AT)等三階段。二十位受測者於三階段測定期間，進行腦波測定及修改之旁側夾擊作業誘發之事件關聯電位測定，由電腦紀錄測得之行為反應及腦波相關測定。在腦波功率測定方面，從腦波信號計算三個基本指標及三個比率指標，腦波功率基本指標a、q及比率指標q/a、(a+q)/b在AT及BT階段有顯著差異。在完成測試作業後腦波事件關聯電位P300成份波之振幅明顯減少，因心算作業對心智反應有增進之效果，致使潛時顯著變短。實驗結果顯示受測者在經歷3小時的VDT作業有明顯之心智疲勞。在60分鐘的休息後，除視覺區外，疲勞無法消除至原先之狀態，本研究所採用之方法，從職業風險管理、生產效能及職業衛生的觀點，可用於評估VDT工作人員之疲勞狀態及心智疲勞管理。

In this study, an attempt was made to evaluate mental fatigue induced during a visual display terminal (VDT) task using electroencephalography (EEG) power indices and P300 component of event-related potential (ERP). The VDT tasks were performed after 60 min of mental arithmetic and 120 min of data entry via computer. Three measurement sessions including before (BT), immediately after (AT), and 60 min after (60-min AT) tasks were undertaken in the present study. Twenty subjects conducted EEG measures and acquired the ERP induced from a modified Flanker task at the three test sessions. Behavior response and EEG measurement were recorded on a personal computer. For EEG power, three basic indices and three ratio indices were calculated from preprocessed EEG signals. EEG power of a, q, q/a and (a+q)/b indices showed significant differences between AT and BT. After the experimental task, the amplitude significantly decreased, and the latency of P300 significantly shortened due to the mental arithmetic task improving the information processing capability. The results indicated the subjects appeared predominantly mental fatigue after three hours of VDT task. After 60 min of rest, the participants’ fatigue did not diminish to original state except in the visual area. The method proposed in this study is potentially applicable to the evaluation of the fatigued state of workers and to the management of mental fatigue from the viewpoints of occupational risk management, productivity, and occupational health.

Chinese Abstract . . . . . . . . . . . . . . . . . . . . . . . . i
English Abstract . . . . . . . . . . . . . . . . . . . . . . . iii
Acknowledgements . . . .. . . . . . . . . . . . . . . . . v
Contents . . . . . . . . . . . . . . . . . . . . . . . vii
List of Tables . . . . . . . . . . . . . . . . . . . . . ix
List of Figures . . . . . . . . . . . . . . . . . . . . . x
List of Abbreviations . . . . . . . . . . . . . . . . . xii
CHAPTER 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Background . . . . . . . . . . . . . . . . . . . . . 1
1.2 Motivation . . . . . . . . . . . . . . . . . . . . . 2
1.3 The Objectives of This Study . . . . . . . . . . . . 2
1.4 Organization of This Dissertation . . . . . . . . . 3
CHAPTER 2 LITERATURE REVIEW . . . . . . . . . . . . . . 4
2.1 Visual Display Terminate (VDT) Task . . . . . . . . 4
2.2 Mental Fatigue . . . . . . . . . . . . . . . . . . . 4
2.3 Cerebrum . . . . . . . . . . . . . . . . . . . . . . 6
2.4 EEG . . . . . . . . . . . . . . . . . . . . . . . . 10
2.5 ERP . . . . . . . . . . . . . . . . . . . . . . . . 15
CHAPTER 3 METHODS . . . . . . . . . . . . . . . . . . . 19
3.1 Subjects . . . . . . . . . . . . . . . . . . . . . 19
3.2 Experimental Procedures . . . . . . . . . . . . . . 19
3.3 Behavior Response Tasks . . . . . . . . . . . . . . 22
3.4. EEG Recording and Data Analysis. . . . . . . . . . 28
CHAPTER 4 RESULTS . . . . . . . . . . . . . . . . . . . 31
4.1 Performance and Psychological Evaluation of Fatigue.31
4.2 EEG Power Spectra . . . . . . . . . . . . . . . . . 34
4.3 P300 component of ERP . . . . . . . . . . . . . . . 44
CHAPTER 5 DISCUSSION AND CONCLUSION . . . . . . . . . . 49
5.1 Discussion. . . . . . . . . . . . . . . . . . . . . 49
5.2 Conclusion . . . . . . . . . . . . . . . . . . . . 52
REFERENCES . . . . . . . . . . . . . . . . . . . . . . 54
APPENDIX A: . . . . . . . . . . . . . . . . . . . . . . 63
APPENDIX B: . . . . . . . . . . . . . . . . . . . . . . 64
APPENDIX C: . . . . . . . . . . . . . . . . . . . . . . 82
APPENDIX D: . . . . . . . . . . . . . . . . . . . . . . 88
PUBLICATION LISTS . . . . . . . . . . . . . . . . . . . 89

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