Abstract

The eye events (eye blink, eyes close and eyes open) are usually considered as biological artifacts in the electroencephalographic (EEG) signal. One can con-trol his or her eye blink by proper training and hence can be used as a control signal in Brain Computer Interface (BCI) applications. Support vector ma-chines (SVM) in recent years proved to be the best classification tool. A comparison of SVM with the Artificial Neural Network (ANN) always provides fruitful results. A one-against-all SVM and a multi-layer ANN is trained to detect the eye events. A com-parison of both is made in this paper.

Highlights

  • The electroencephalogram, or EEG, consists of the electrical activity of relatively large neuronal populations that can be recorded from the scalp

  • The ‘trainlm’ is often the fastest backpropagation algorithm in the neural network toolbox, and is highly recommended as a first-choice supervised algorithm, it does require more memory than other algorithms

  • The Feed Forward Back Propagation (FFBP) network is trained in just 23 seconds using the trainlm algorithm and is faster than Artificial Neural Network (ANN) that uses other training algorithms

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Summary

INTRODUCTION

The electroencephalogram, or EEG, consists of the electrical activity of relatively large neuronal populations that can be recorded from the scalp. There are five major brain waves distinguished by their different frequency ranges. These frequency bands from low to high frequencies respectively are called delta (δ), theta (θ), alpha (α), beta (β), and gamma (γ). Eye events (eye blink, eyes close and eyes open) are normally considered as physiological artifacts in the EEG. Eye blink signals can be used in BCI applications like virtual keyboard while the eye close and eyes open signals can be used for folding and opening electric foldable hospital beds. The aim of Support Vector classification is to devise a computationally efficient way of learning ‘good’ separating hyperplanes in a high dimensional feature space, where ‘good’ hyperplanes are ones optimizing the generalization bounds, and ‘computationally efficient’ mean algorithms able to deal with sample sizes of the order of 100000 instances [8]

EYE EVENT CHARACTERISTICS
Amplitude
Kurtosis
ARTIFICIAL NEURAL NETWORK
SUPPORT VECTOR MACHINES
SIGNAL ACQUISITION AND
PREPROCESSING OF DATA FOR
RESULTS AND DISCUSSIONS
CONCLUSION
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