雙頻穩態視覺誘發電位系統之研究

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姓名

劉郁汝(Yu-ju Liu) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

雙頻穩態視覺誘發電位系統之研究
(Research on Dual-Frequency Steady-State Visual Evoked Potentials Induced System)

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摘要(中)

一般而言，穩態視覺誘發電位（steady state visual evoked potential ,SSVEP）的選項方式，其中的各單一選項使用不同頻率閃爍刺激誘發的方式。而本論文中，提出一種新的穩態視覺誘發電位閃爍方法，本研究在單一選項的閃爍刺激中，使用兩個不同頻率誘發的穩態視覺誘發系統，稱為雙頻穩態視覺誘發電位（dual-frequency SSVEP），並經由多個受測者的實驗結果證明本方法的可行性。在實驗的過程中，將受測者的腦電訊號（electroencephalography , EEG）使用傅立葉轉換（fourier transform, FFT）分析，發現受測者的腦電訊號裡，有時含有除了主要刺激頻率以外的訊號，此多出的頻率訊號與兩個主要誘發頻率有對稱的現象，稱為對稱諧波現象（symmetric harmonic phenomena），有助於加強辨識。本研究亦提出一個新的相關性計算方法（correlation method）處理這種雙頻閃爍刺激誘發的腦電訊號。經由實驗中發現，本研究所提出的方法在辨識率方面優於傳統被大量使用的快速傅利葉轉換的方法。此外，本論文將所提出的雙頻穩態視覺誘發電位，加入了多相位編碼的閃爍序列。然而，大腦是一個非線性系統，而腦電訊號是其輸出的訊號。而這種包含不同頻率甚至不同相位的腦電訊號是否可被成功的分析，亦是本研究所探討的重點。

摘要(英)

This dissertation presents a new steady-state visual evoked potential (SSVEP). Different
from the general SSVEP using only one frequency flicker for each selection of flash
stimulators, this work uses a dual-frequency flicker. This dissertation verifies the feasibility of
the proposed method, and the symmetric harmonic phenomena are found in this study. Then
this dissertation proposes a novel correlation method for frequency recognition of
dual-frequency SSVEP. The results further demonstrate that the proposed correlation method has a higher recognition rate than the widely used fast Fourier transform (FFT)method in the proposed system. Moreover, the dual-frequency embedded with the multi-phase flickering sequences stimulation method is proposed. But the brain is a nonlinear dynamic system, and Electroencephalography (EEG) signal can be regarded as its output. The EEG signals in this dissertation include difference frequencies even phases. However, whether this kind of signals is treated as the meaningful signals is researched.

關鍵字(中)

★ 穩態視覺誘發電位
★ 雙頻
★ 相關性方法
★ 腦電訊號

關鍵字(英)

★ Steady-state visual evoked potential (SSVEP)
★ dual-frequency
★ correlation method
★ electroencephalography(EEG)

論文目次

摘要 .............................................................................................................................................I
ABSTRACT .............................................................................................................................. II
誌謝 .......................................................................................................................................... III
LIST OF FIGURES..................................................................................................................VI
LIST OF TABLES ....................................................................................................................X
ABBREVIATION....................................................................................................................XI
CHAPTER 1 INTRODUCTION................................................................................................ 1
1.1 Motivations................................................................................................................... 1
1.2 Visual Evoked Potential (VEP) .................................................................................... 2
1.3 Phase Encoding Flickering Sequences for SSVEP Induce System.............................. 5
1.4 Electroencephalogram.................................................................................................. 7
1.5 Electrodes ..................................................................................................................... 8
1.6 Dissertation Overview................................................................................................ 10
CHAPTER 2 DUAL-FREQUENCY SSVEP .......................................................................... 11
2.1 Overview .................................................................................................................... 11
2.2 Visual Stimulators ...................................................................................................... 11
2.3 Signal Recorder .......................................................................................................... 13
2.4 The Experiment Results.............................................................................................. 13
2.5 Summary..................................................................................................................... 25
V
CHAPTER 3 FREQUENCY RECOGNITION OF MULTI-FREQUENCY
STIMULATORS ................................................................................................ 26
3.1 Overview .................................................................................................................... 26
3.2 Method........................................................................................................................ 27
3.2.1 Subjects and Recordings.................................................................................. 27
3.2.2 Stimulation ...................................................................................................... 27
3.2.3 Signal Processing............................................................................................. 28
3.3 Results ........................................................................................................................ 30
3.4 Summary..................................................................................................................... 36
CHAPTER 4 MULTI-TARGET STIMULATOR SSVEP USING DUAL-FREQUENCY
EMBEDDED WITH MULTI-PHASE ENCODING SEQUENCE................... 37
4.1 Overview .................................................................................................................... 37
4.2 Stimulator ................................................................................................................... 38
4.3 EEG Recordings and Signal Processing..................................................................... 40
4.4 Results ........................................................................................................................ 42
4.5 Summary..................................................................................................................... 49
CHAPTER 5 CONCLUSIONS................................................................................................ 50
5.1 Conclusions ................................................................................................................ 50
5.2 Future Works .............................................................................................................. 50
REFERENCES......................................................................................................................... 52
LIST OF PUBLICATIONS...................................................................................................... 59
VITA......................................................................................................................................... 61

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指導教授

徐國鎧、李柏磊
(Kuo-kai Shyu、Po-lei Lee)

審核日期

2013-5-21

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