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. Author manuscript; available in PMC: 2010 Feb 18.
Published in final edited form as: Curr Protoc Neurosci. 2009 Oct;CHAPTER:Unit10.2. doi: 10.1002/0471142301.ns1002s49

Figure 3.

Figure 3

Common EEG artifacts. An unstable rolling baseline is commonly called a sweat artifact whether or not it is caused by the subject sweating. The 60-Hz artifact is seen as a dark buzz riding on top of the normal EEG. When expanded (not shown), 60 waves per second can be seen. Movement artifacts are characterized by a combination of high-frequency EMG and a low-frequency component caused by cable sway. Regular periodic bursts of high-frequency EMG activity are seen on the EEG trace during teeth grinding. Pulse artifacts are typically recorded by A1 or A2 electrodes and are most apparent during low amplitude EEG in REM sleep.