Removal of the ocular artifact from the EEG: a comparison of time and frequency domain methods with simulated and real data

Constructed 2 data sets from simulated data, in which the transfer from electrooculogram (EOG) to EEG was either frequency-independent (constant gain) or frequency-dependent. Three different correction methods were applied: simple regression analysis (RA) in the time domain, a multiple-lag RA in the time domain, and an RA in the frequency domain. For Data Set 1, the 3 methods constructed the original EEG equally well. With Data Set 2, reconstruction of the original EEG was achieved reasonably well with the frequency domain method and the time domain multiple-lag method, but not with simple time domain regression. These 3 correction procedures were also applied to real data, consisting of concomitantly recorded EEG and high-variance EOG series. There were no differences in outcome of the 3 methods.