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경험적 모드 분해를 이용한 시각자극 관련 과제수행에 대한뇌 유발전위 진폭과 위상 변화 분석

Other Titles
 Amplitude and phase analysis of the brain Evoked Potential about performing a task related to visual stimulus using Empirical mode decomposition 
 이벽진  ;  유선국 
 Korean Journal of the Science of Emotion & Sensibility (감성과학), Vol.18(1) : 15-26, 2015 
Journal Title
Korean Journal of the Science of Emotion & Sensibility(감성과학)
Issue Date
Visual stimulus ; Evoked potential ; Empirical mode decomposition(EMD) ; Hilbert transform
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.
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Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Medical Engineering (의학공학교실) > 1. Journal Papers
Yonsei Authors
Yoo, Sun Kook(유선국) ORCID logo https://orcid.org/0000-0002-6032-4686
Lee, Byuk Jin(이벽진)
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