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) and right (green) eye measured using EOG (Electrooculography); third line, EMG (Electromyography) (red); fourth line, EEG (Electroencephalograph) brain wave (yellow).
Model release not required. Property release not required.