博碩士論文 101331020 詳細資訊




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姓名 洪百泉(Pai-Chuan Hung)  查詢紙本館藏   畢業系所 生物醫學工程研究所
論文名稱 利用同步腦電圖與功能性磁振造影探討睡眠階段之大腦活動
(Investigating Brain Oscillations across Sleep Stages using Simultaneous EEG-fMRI Recording)
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摘要(中) 睡眠對於許多動物來說是不可或缺的生理節律,其功能除了調整生理狀態外,亦會重整大腦的認知功能,例如情緒及專注力調節;先前文獻亦指出深層睡眠(非快速動眼期第三階段)更與記憶鞏固息息相關。但過往睡眠相關研究大多專注於特定睡眠階段或是特定睡眠指標進行探討,鮮少有跨睡眠階段之全頻帶研究。因此為了了解睡眠中大腦網路的動態變化,我們首次嘗試使用同步腦電圖與功能性磁振造影來觀察正常受試者大腦網路在清醒狀態與非快速動眼睡眠(尤其是深層睡眠)間之差異。本論文著重於兩大目標:(1)探討腦波各頻帶在跨睡眠階段的頻率能量以及其網路連結之變化,以及(2)觀察有無深層睡眠對大腦活動的潛在影響。結果發現,腦波各頻帶在不同睡眠階段中有其特定的空間分佈以及功能性連結變化的差異;例如低頻Delta波在睡眠深度越深時除了能量逐漸增強外,其網路連結亦會從清醒時的縱向連結逐漸轉變為橫向連結。此外,缺少深層睡眠發現對清醒後的頻譜能量與橫向連結並無顯著影響,但對清醒後的縱向連結有顯著變化,暗示慢波睡眠的功用可能著重在改變大腦網路的縱向連結。不過在腦電圖以及功能性磁振造影都的結果中都發現頻率表現和網路連結不見得會呈現相同趨勢。整體而言,本論文證明腦波各頻帶在不同睡眠階段具有頻率響應及網路連結的動態特異性,而深層睡眠不僅在大腦網路調節上扮演著重要角色,有可能也會對甦醒後的腦部活動產生衝擊。
摘要(英) Sleep is an important physiological rhythm for many creatures, not only associated with physical regulation but also associated with mental reorganization. It has been proven that sleep correlates with lots of cognitive functions such as the emotion regulation, memory consolidation and attention. Previous sleep studies were typically conducted using electroencephalography (EEG), targeting on the changes of specific frequency bands or certain sleep stage; however, dynamic changes was rarely reported across all frequency bands and sleep stages. Therefore, to reveal the dynamicity within sleeping brain, we first investigate the sleeping EEG power and connectivity across frequency bands and non-rapid-eye-movement (NREM) sleep stages using simultaneous EEG-fMRI. Our second goal is to observe the impact of slow wave sleep (SWS) on brain activity and connectivity. Our results indicated spectral and regional disparities in EEG power and connectivity analysis across sleep stages. For example, the delta band showed increasing power along with deep sleep stages, meanwhile the delta connectivity pattern converted from waking longitudinal connection into a transverse connection during sleep. Secondly, the low-frequency bands did not show significant SWS effect on awakening in both power and transverse connectivity, but presented strong changes in longitudinal connectivity, which implied that slow wave sleep modulates the brain longitudinal connectivity. Furthermore, it should be noted that both EEG and fMRI presented a dissimilar mismatch between the spectral power and functional connectivity across sleep stages. Conclusively, this study indicate that during NREM sleep, EEG frequency bands had their own dynamic features in both power and connectivity, and lack of slow wave sleep might affect the consecutive functional connectivity upon awakening.
關鍵字(中) ★ 非快速動眼睡眠
★ 腦波
★ 頻率
★ 網路連結
關鍵字(英)
論文目次 中文摘要 V
Abstract VI
Contents VII
List of Figures IX
List of Tables X
Chapter 1. Introduction 1
1.1 Research Purpose 1
1.2 Hypothesis and Aim 2
Chapter 2. Background 3
2.1 Sleep in EEG recording 3
2.2 Simultaneous EEG and fMRI 5
Chapter 3. Material and Methods 6
3.1 Participants preparation 6
3.2 Experiment Design and Protocol 8
3.2.1 Experiment Design 8
3.2.2 EEG Protocol 10
3.2.3 fMRI Protocol 11
3.3 Data Preprocessing 13
3.3.1 EEG noise removal and preprocessing 13
3.3.2 fMRI preprocessing 13
3.4 Data Analysis 14
3.4.1 Spectral analysis 14
3.4.2 EEG connectivity analysis 15
3.4.3 Statistical analysis 17
Chapter 4. Optimization of EEG Artifact-removal Strategies 18
4.1 Gradient field artifacts removal 19
4.2 Ballistocardiographic artifacts removal 21
4.3 Comparison between Analyzer and EEGLAB 23
4.3.1 Consistency in time series 24
4.3.2 Comparison using spectral analysis 25
4.3.3 Comparison using time-frequency analysis 27
Chapter 5. Results 30
5.1 Sleep scoring 30
5.2 Changes of spontaneous brain activity in multiple sleep stages 33
5.2.1 Spectral changes across multiple sleep stages 33
5.2.2 Topography of EEG connectivity across sleep stages 37
5.3 Changes of spontaneous brain activity in lack of deep sleep 41
5.3.1 Comparison between Pre-sleep & Awakening: Spectral Power 41
5.3.2 Comparison between Pre-sleep & Awakening: EEG connectivity 47
Chapter 6. Discussion 53
6.1 Spectrum and topography distribution 53
6.1.1 Delta dominated in anterior and posterior regions 53
6.1.2 Theta dominated in anterior and posterior regions 54
6.1.3 Alpha dominated in posterior regions 54
6.1.4 Beta dominated in anterior and posterior regions 55
6.2 Topography of EEG connectivity 55
6.2.1 Increased transverse connection in delta band during sleep 55
6.2.2 Decreased transverse connectivity in theta band upon awakening in without-N3 group 56
6.2.3 Higher anterior/posterior connectivity in alpha/beta band 57
6.4 Comparison between EEG and fMRI results 57
6.4.1 fMRI results across sleep stages 57
6.4.2 Comparison between pre-sleep and awakening in fMRI 63
6.4 Limitation 66
Chapter 7. Conclusion 67
References 68
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指導教授 吳昌衛 審核日期 2016-1-27
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