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Artifacts
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Abstract
This chapter takes a comprehensive look at physiological and nonphysiological artifacts commonly encountered in MEG and EEG studies. After description of the occurrence, morphology, and topographical distribution of the artifacts, suggestions are given for their removal. Physiological artifacts can be caused by eye movements and blinks; muscle contractions (in the face, head, and body); heart’s pulsation and electrical activity; respiration; and sweating. Examples of nonphysiological artifacts are provided and include power-line noise, response-box artifacts, and artifacts generated by poorly sited EEG electrodes, or malfunctioning MEG or EEG sensors. We also discuss artifacts produced by other equipment used in conjunction with EEG/MEG, such as magnetic resonance imaging (MRI) scanners and noninvasive brain stimulators. The chapter concludes with some thoughts about how to ensure that the measured signals arise from the brain.
Title: Artifacts
Description:
Abstract
This chapter takes a comprehensive look at physiological and nonphysiological artifacts commonly encountered in MEG and EEG studies.
After description of the occurrence, morphology, and topographical distribution of the artifacts, suggestions are given for their removal.
Physiological artifacts can be caused by eye movements and blinks; muscle contractions (in the face, head, and body); heart’s pulsation and electrical activity; respiration; and sweating.
Examples of nonphysiological artifacts are provided and include power-line noise, response-box artifacts, and artifacts generated by poorly sited EEG electrodes, or malfunctioning MEG or EEG sensors.
We also discuss artifacts produced by other equipment used in conjunction with EEG/MEG, such as magnetic resonance imaging (MRI) scanners and noninvasive brain stimulators.
The chapter concludes with some thoughts about how to ensure that the measured signals arise from the brain.
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