Review of State of Art in Electrooculogram Artifact Removal from Electroencephalogram Signals

Electroencephalogram (EEG) is a time varying brain electrical activity, highly sensitive and gives a coarse view of neural activity. It has been used to study cognitive processes and the physiology of the brain. EEG recordings are distorted by physiological and non- physiological signals causing problems to the clinicians, neuropsychologist and researchers for analysis, interpretation and diagnosis. Artifacts, compromise investigation by masking effects of interest or diminish specificity by masquerading as a neurogenic effect. Advances in signal processing have brought significant improvement in removal of these artifacts from the recorded EEG. The possible ocular artifacts are of great significance and concern as they contaminate the signal to a larger extent. The objective of this paper is to present a detailed survey of the published literature of various techniques for the removal of the various artifacts, especially artifact due to movement of eyes. An evaluation of various detection, rejection and removal techniques is elaborated, with the emphasis on the principles of the various methods, followed by the relative advantages and disadvantages of each.

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