Removal of Ocular Artifacts from EEG—A Survey

Eyelid and eyeball movement cause changes to the electric fields around the eyes, and consequently over the scalp. As a result electroencephalogram (EEG) recordings are often significantly distorted, causing problems for analysis and interpretation by clinicians, and also the contamination of the EEG with potentials that originate from movements of the eyelid or eyeball are a nuisance for researchers who investigate the electrophysiology of the brain. Many methods have been proposed to remove artifacts from EEG recordings, especially those arising from eye movements and blinks. The purpose of this article is to present a survey of the published literature in dealing with ocular artifacts in the EEG, focusing on the relative merits and demerits of a variety of EOG correction procedures.