Potentials recorded from the scalp are generated by brain sources, environmental and hardware system noise, and biological artifacts. Biological artifacts often contaminate EEG records and generally pose a more serious problem than environmental or system noise. Common artifact sources include whole body movement, heart, muscle, eyes, and tongue. EEG records containing large artifacts are often discarded. Artifact removal by computer is typically successful only for the largest artifacts. Such automated artifact editing is severely limited because the frequency bands of biological artifacts substantially overlap the important EEG bands, making distinctions between artifact and brain signal difficult.



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