JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Sleep research, composite image. Sleeping woman with EEG (electroencephalogram) electrodes attached to her head in sleep research laboratory. The electrodes monitor brain and muscle activity. Sample traces from a 10 second period of stage 4 of non-REM (Rapid Eye Movement) sleep are shown in the top frame of the image. This is part of a study to understand the effects of pharmaceuticals on the brain.
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