Decoding English Alphabet Letters Using EEG Phase Information

Frontiers in Neuroscience
YiYan WangYuguo Yu

Abstract

Increasing evidence indicates that the phase pattern and power of the low frequency oscillations of brain electroencephalograms (EEG) contain significant information during the human cognition of sensory signals such as auditory and visual stimuli. Here, we investigate whether and how the letters of the alphabet can be directly decoded from EEG phase and power data. In addition, we investigate how different band oscillations contribute to the classification and determine the critical time periods. An English letter recognition task was assigned, and statistical analyses were conducted to decode the EEG signal corresponding to each letter visualized on a computer screen. We applied support vector machine (SVM) with gradient descent method to learn the potential features for classification. It was observed that the EEG phase signals have a higher decoding accuracy than the oscillation power information. Low-frequency theta and alpha oscillations have phase information with higher accuracy than do other bands. The decoding performance was best when the analysis period began from 180 to 380 ms after stimulus presentation, especially in the lateral occipital and posterior temporal scalp regions (PO7 and PO8). These results may provi...Continue Reading

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Citations

Apr 23, 2020·Frontiers in Neuroscience·Debadatta DashJun Wang

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Methods Mentioned

BETA
imaging technique

Software Mentioned

Matlab
MATLAB FDA
LIBSVM
EEGLAB

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