Application of a Brain Computer Interfacing System in Comparing Visual verses Haptic Induction of Motor Imaginary Task

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薩特亞(SATYASAMBIT RATH) 查詢紙本館藏

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認知與神經科學研究所

論文名稱

(Application of a Brain Computer Interfacing System in Comparing Visual verses Haptic Induction of Motor Imaginary Task)

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摘要(中)

運用觸覺刺激的腦機介面，干擾認知功能運作的程度較運用視覺或聽覺刺激的腦機介面為低，而在現實世界中有很高的應用價值。先前文獻對於觸覺型腦機介面能否達到與視覺型相當的動作心像類型辨識率尚無結論；此外，運用極少量腦波頻道數是否能達到高動作心像類型辨識率亦屬未知。本研究試圖建立一個腦機介面架構，僅運用四個腦波頻道資訊來進行動作心像類型辨識，然後比較其辨識觸覺和視覺誘發動作心像時之正確率。我們發現應用共同空間型態(common spatial pattern)作為特徵提取器，以及線性區辨分析(linear discriminant analysis)為分類器(classifier)，對觸覺與視覺誘發的左、右手動作心像區辨正確率是相當的；而僅運用C3、C4、Fp1、和Fp2四個頻道的情況下，觸覺與視覺型腦機介面的辨識正確率都可達到85%。本研究之發現可作為未來發展高效能動作心像辨識腦機介面系統之基礎。

摘要(英)

Haptic-based Brain Computer Interface (BCI) has great values in real-world applications as it
is less intrusive than visual or auditory based BCI. It is not clear from previous literature
whether haptic-based BCI can achieve equivalent or even better accuracies when applied to the
classification of motor imagery. In addition, it was also not clear whether high classification
accuracy can be achieved in haptic cue based motor imagery BCI with few channels. The
current study sets out to establish a BCI framework using only four channels for motor imagery
classification, and to compare the accuracies between the haptic versus the visual cue based
BCI. We demonstrated that using common spatial pattern (CSP) as feature extractor and linear
discriminant analysis (LDA) algorithm as the classifier, the classification accuracy of the haptic
cue based motor imaginary BCI can reach comparable level as the visual-based one. We also
demonstrated that with only four EEG channels (C3, C4, Fp1, and Fp2), the mean accuracy of
both haptic and visual cue based motor imaginary BCI can reach a high level (~ 85%). The
current findings can serve as the foundation for efficient BCI implementation in motor imagery
classification for future research and real-world applications.

關鍵字(中)

★ 腦機介面
★ 觸覺線索
★ 視覺線索
★ 共同空間型態
★ 線性區辨分析

關鍵字(英)

★ BCI
★ haptic cue
★ visual cue
★ Common spatial pattern
★ linear discriminant analysis

論文目次

Chapter 1-Introduction 1
1.1- BCI Classification of Motor Imaginary Based on Visual Cues 2
1.2-Haptic Cue based motor imaginary BCI study 3
1.3 Aims of the current study 5
Chapter 2-Method 6
2.1-Data Collection 6
2.1.1-Participants 6
2.1.2-Data Acquisition 6
2.2-Experimental Paradigms for Different Cue Modalities 7
2.2.1-Visual Cue Experiment Protocol 8
2.2.2-Haptic Cue Experiment Protocol 9
2.3-Data verification 12
2.4-Preprocessing 15
2.5-Feature Extraction 17
2.6-Classification 20
2.7-Cross Validation: 21
2.8-Accuracies 22
Chapter 3-Results 26
3.1-Visual Cue based motor imaginary BCI result 26
3.2-Haptic Cue based motor imaginary BCI results 27
3.3-Comparison between the Visual and the Haptic-based BCI 27
Chapter 4-Discussion 29
4.1-Haptic stimuli and the organization of the somatosensory cortex 29
4.2-Channel selection and the accuracy of MI-BCI 31
Chapter 5-Conclusions 33
References 35

參考文獻

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指導教授

張智宏

審核日期

2017-8-28

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