Parts of a normal EEG
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| Alpha frequency | show 🗑
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| show | > 12 Hz
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| show | 4 to 7 Hz
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| Delta frequency | show 🗑
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| show | 8-12 Hz, 20-70 microvolts, occipital, blocks on eye opening
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| Stage I non-REM sleep | show 🗑
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| show | Vertex waves, sleep spindles
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| show | > 25% delta, > 75 microvolts, sleep spindles
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| REM sleep | show 🗑
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| show | graphic representation of the difference in voltage between two different cerebral
locations in time.
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| show | the process of current flow through the tissues between the electrical generator and the recording electrode
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| EEG source | show 🗑
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