Brain waves recorded on an electroencephalogram (EEG), showing the results at 15 Hertz with the eyes closed. An EEG measures the electrical activity o

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Brain waves recorded on an electroencephalogram (EEG), showing the results at 15 Hertz with the eyes closed. An EEG measures the electrical activity of the brain (brain waves) using electrodes attached to the scalp. Various disorders can be diagnosed by analysing EEG results. These results are from a 30-year-old woman.

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Photo credit: © DR P. MARAZZI/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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