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Is ocular voltage propagation to the electroencephalogram frequency dependent?
Author(s) -
Pham Trieu T. H.,
Croft Rodney J.,
Cadusch Peter J.
Publication year - 2009
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.2009.00836.x
Subject(s) - electroencephalography , frequency domain , noise (video) , scalp , psychology , frequency analysis , ranging , signal (programming language) , eye movement , audiology , acoustics , physics , mathematics , artificial intelligence , computer science , neuroscience , telecommunications , medicine , mathematical analysis , image (mathematics) , anatomy , programming language
Abstract Conventional eye correction methods subtract portions (propagation coefficients; Bs ) of electrooculogram (EOG) voltages from the electroencephalogram (EEG). The frequency domain approach (FDA) uses different B s for different frequencies whereas the time domain approach (TDA) uses the same B s. To determine whether measured B s are dependent on frequency and whether one should employ frequency‐dependent methods, 20 min of EEG from eye movement (EM) and blink data (24 participants) were recorded, and B s were calculated for eye movement ERPs of differing signal‐to‐noise ratios for frequency bands ranging from 0 to 40 Hz and compared. At high signal to noise, EM B s for different frequency bands did not differ, for both vertical and horizontal EOG, at all scalp sites tested. There were small differences in blink B s for different bands, but smaller than the margin of error of this analysis. This indicates that TDA may be more appropriate than FDA.