Sleep research: polysomnogram print-out from a subject in rapid eye movement (REM) sleep,showing traces relating to electrical activity in the brain,heart and facial muscles. Sleep comprises cycles of 5 stages: 1-4 are stages of increasingly deeper,non-rapid eye movement (NREM) sleep,with REM sleep following as stage 5. Electrical activity is lowest during stage 4 sleep. The polysomnograph is a hybrid of various instruments: an electrocardiograph (ECG) records the heart's pulse,an electroencephalograph (EEG) reveals electrical activity in the brain & an electromyograph relates to muscular activity around the eyes and neck | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Plailly, Philippe |
Bildgröße: | 5051 px × 3228 px |
Modell-Rechte: | nicht erforderlich |
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