OMIKRON / SCIENCE PHOTO LIBRARY OMIKRON / SCIENCE PHOTO LIBRARY
Colour enhanced polygraph tracings of REM (Rapid Eye Movement) period. First two lines: movements of the left (blue-violet) and right (blue) eye measured using EOG (Electrooculography); third line, EMG (Electromyography) (yellow); fourth line, EEG (Electroencephalograph) brain wave (green).
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