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http://dx.doi.org/10.14695/KJSOS.2015.18.1.15

Amplitude and phase analysis of the brain Evoked Potential about performing a task related to visual stimulus using Empirical mode decomposition  

Lee, ByuckJin (Graduate School of Biomedical Engineering, Yonsei University)
Yoo, Sun-Kook (Department of Medical Engineering, Yonsei University)
Publication Information
Science of Emotion and Sensibility / v.18, no.1, 2015 , pp. 15-26 More about this Journal
Abstract
In this paper, amplitude and phase difference patterns for theta and alpha bands of the Evoked Potential(EP) in relation to perform a task at visual stimulus were analyzed using the Empirical mode decomposition(EMD). The EMD is applied to decompose EP signals with task-related sub-frequency band signals. Intrinsic mode function was implied in Hilbert transform and instantaneous amplitude and phase differences of theta and alpha were derived from Hilbert transformed EP. In a task status, large amplitude for both bands was observed at P2, N2, and P3 points as well as maximum phase difference was observed at N1 and P2. We confirmed that both bands are associated with a task at visual stimulus, and less associated with fixation. The proposed method enhances the time and frequency resolution in comparison with band-pass filter method which observed different phase results according to conditions.
Keywords
Visual stimulus; Evoked potential; Empirical mode decomposition(EMD); Hilbert transform;
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