A simple on-line technique for removing eye movement artifacts from the EEG

Abstract

A simple on-line technique for removing potentials generated by eye movements from the EEG is presented. A circuit is described which subtracts a fraction of both the vertical and horizontal EOG signals from the EEG signal to be corrected. EEG potentials derived from vertex-right mastoid electrodes were used to demonstrate the technique. By visual inspection of the corrected EEG trace it appears that the eye movement artifact is almost completely removed. These results hold for both small and large eye movements and are not affected by light and dark adaptation. Computer averaging techniques were used to verify the results.