[On the auto-reference, auto-correlation and adaptive interference cancellation theories and techniques for single extracting flash visual evoked potential].
On the basis of analyzing the defects in traditional averaging theory for extracting evoked potential (EP), and by realizing the characteristic of spontaneous electroencephalo-signal (S-EES) as well as the special environment for extracting EP, we propose an auto-reference, auto-correlation, adaptive interference cancellation (AAA-ICT) for use in the single trial of flash visual evoked potential (FVEP). Firstly, the segment of reference signal, which has the best correlation with evoked electroencephalo-signal (E-EES), was obtained using the method for calculating the sliding correlation point by point between E-EES and reference signal; then, the cancellation factor between E-EES and the most correlative reference signal segment was derived by the least square method; at last, the single trial of FVEP was acquired by interference cancellation. By this method, FVEP can be extracted perfectly and the FVEP variability of individual inter-stimulation can be obtained.
Wang
Zhifang
Z
Chongqing Medical Instrument Quality Inspection Center, Chongqing 401121, China.
Xie
Zhengxiang
Z
Zhong
Xuefei
X
Wang
Ying
Y
Li
Hong
H
Liu
Yuhong
Y
Yang
Juan
J
Zhang
Jing
J
Huang
Zuchun
Z
D000465:Algorithms; D004569:Electroencephalography / Q000379:methods*; D005074:Evoked Potentials, Visual / Q000502:physiology*; D006801:Humans; D012815:Signal Processing, Computer-Assisted