| Cardiac artifacts in magnetoencephalogram. | |
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MedLine Citation:
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PMID: 8849972 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We studied cardiac contamination of magnetoencephalographic signals in eight healthy volunteers. The signals were recorded in a magnetically shielded room while the subject was sitting under a whole-scalp neuromagnetometer and were averaged time-locked to the R wave of the electrocardiogram. The maximum amplitude of the cardiac artifact varied between the subjects and was on average 130 fT/cm. The number of significantly contaminated channels was higher over the left than the right hemisphere. The electric and magnetic signals varied over time in the same way, implying that the artifacts are generated by cardiac currents, without any significant contribution from blood-flow-related pulsations or body movements. These artifacts may have a considerable effect on unaveraged data, i.e., recordings of spontaneous brain activity, and thus should be taken into account in the analysis. |
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Authors:
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V Jousmäki; R Hari |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of clinical neurophysiology : official publication of the American Electroencephalographic Society Volume: 13 ISSN: 0736-0258 ISO Abbreviation: J Clin Neurophysiol Publication Date: 1996 Mar |
Date Detail:
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Created Date: 1996-12-06 Completed Date: 1996-12-06 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8506708 Medline TA: J Clin Neurophysiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 172-6 Citation Subset: IM |
Affiliation:
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Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Artifacts Brain / physiology* Electrocardiography Electrooculography Hearing / physiology* Humans Magnetoencephalography* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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