Extraction of single-trial cortical beta oscillatory activities in EEG signals using empirical mode decomposition |
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| Authors: | Chia-Lung Yeh Hsiang-Chih Chang Chi-Hsun Wu Po-Lei Lee |
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| Affiliation: | (1) Department of Electrical Engineering, National Central University, Jhongli, Taiwan;(2) Laboratory of Integrated Brain Research, Department of Medical Research and Education, Taipei Veterans General Hospital, Taipei, Taiwan;(3) Institute of Brain Science, National Yang-Ming University, Taipei, Taiwan |
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| Abstract: | Background Brain oscillatory activities are stochastic and non-linearly dynamic, due to their non-phase-locked nature and inter-trial variability. Non-phase-locked rhythmic signals can vary from trial-to-trial dependent upon variations in a subject's performance and state, which may be linked to fluctuations in expectation, attention, arousal, and task strategy. Therefore, a method that permits the extraction of the oscillatory signal on a single-trial basis is important for the study of subtle brain dynamics, which can be used as probes to study neurophysiology in normal brain and pathophysiology in the diseased. |
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