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As part of a set of materials about brain scanning technologies, this web page describes and illustrates what an EEG (electroencephalograph) is. It explains that although EEGs are not technically brain scans, they are included in the site as an example of an earlier, noninvasive technology that researchers still employ to gather brain data. EEGs record the brain's electrical activity. The text notes the kind of information that EEGs can and cannot provide to researchers and touches on its history. Copyright 2005 Eisenhower National Clearinghouse
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