前額視覺誘發電位擷取方法

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姓名

張志聰(Chih-Tsung Chang) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

前額視覺誘發電位擷取方法
(A novel method for the detection of frontal VEP signals)

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摘要(中)

本研究創新研發一種電位方式，將電極放置在前額擷取EEG訊號，並且加入梳狀濾波
器在相位編碼中，處理訊號裡的雜訊。此方法是在前額葉(Fpz)上放置電極以擷取視覺誘
發電位(VEP)信號，取代傳統測量方式中使用的枕葉(Oz)區擷取視覺誘發電位。我們將廣
泛的應用在視覺誘發電位的方法，包括穩態視覺誘發電位(SSVEP)、閃光視覺誘發電位
(FVEP)和相位編碼(Phase)來研究，並且比較枕葉(Oz)和前額葉(Fpz)位置的腦波信號。
在傳統擷取腦波枕葉(Oz)位置的方式，實際操作中會受到人的頭髮干擾，且還需額外的
電極來擷取眼動訊號(EOG)並且過濾它。我們提出的方法可以有效地獲得視覺誘發電位和
眼動訊號，並且不需要像在枕葉(Oz)位置需要除去大量頭髮的前置作業準備，我們還可
以減少擷腦波訊號的電極數量。在前額電極擷取腦波訊號可能是設計腦人機介面的一個
重大突破。

摘要(英)

This research represents a new electrode positioning on the frontal lobe to collect EEG
signals. Through this we also incorporated comb filter to filter signal noise upon signal
collection. The novel method examine visually evoked potential (VEP) by placing an electrode
on the frontal lobe (Fpz), on the other hand, the traditional method involves placing the
electrode at the mid-occipital location (Oz). We used three different widely used VEP
methods, namely steady-state VEP (SSVEP), flash VEP (FVEP) and Phase and analyze the
brain wave signals from both the Oz and Fpz location. Traditional Oz location of signal
processing involves an extra electrode as well as hair interference. Our frontal novel electrode
placement not only trigger the VEP signal, it also process the EOG signal at the same time
without preparation of hair and addition electrodes. The frontal lobe of positioning electrode to
analyze the VEP signal is a remarkable breakthrough in the BCI system application.

關鍵字(中)

★ 梳狀濾波器
★ 穩態視覺誘發電位
★ 閃光視覺誘發電位
★ 相位編碼

關鍵字(英)

★ Comb filter
★ Steady-state visual evoked potential
★ Flash Visual Evoked Potential
★ Phase encoding

論文目次

List of Contents
中文摘要 ...... i
Abstract ...... ii
致謝 .......iii
List of Figures …………………………………vi
List of Tables ……………………………………viii
Chapter 1 Introduction .............. 1
1.1 Motivation and Background ……………………1
1.2 Brain computer interface (BCI) ………2
1.3 Visual stimulator ………………………………… 6
1.4 Types of brain waves …………………………………8
Chapter 2 Fpz and Oz the visual evoked potential of Electrode to Detect
EEG Signals ………………………………….....12
2.1 Subjects and Tasks………….….…12
2.3 Transmission of the VEP throughout the brain ………13
2.4 EEG Extraction Method ……….…………………………………….…..……….15
2.5 Overview of the experiment set up ………………………………….17
Chapter 3 EEG Signal Transduction Pathway and Analytical Methods ………………18
3.1 VEP signals ……………………18
3.2 Fvep ………………………………………20
3.3 SSVEP ……..…………………..…25
3.4 Phase …………………….……………29
3.5 The correct rate of Fpz and Oz …...…………………32
3.6 Results ……..………………………………………………..…..…………….…34
Chapter 4. Using Comb Filter to Improve Phase Signal Extraction …………..……...…35
4.1 Feedback digital comb filter with variable delay………………………35
4.2 Comb filter and signal phase……………………….39
4.3 Choosing α and flickering frequency ……42
4.4 Results ……………………………………………………46
Chapter 5 Conclusion ……………………………47
Reference …………………………………………………………49
Publication List ………………………………………53

參考文獻

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指導教授

李柏磊(Po-Lei Lee)

審核日期

2018-8-21

推文