Patient monitored during a sleep research study

Bildnummer 11863964
Patient monitored during a sleep research study
MODEL RELEASED. Sleep research. Male patient (in the background) is wired up to somniography equipment used in a sleep research study. In the foreground a researcher at a monitor examines a data printout. Electrodes on the patient's head record electrical brain activity (a type of electroencephalograph or EEG); sensors on the face are used to measure tension or movement in various facial muscles during sleep. Heartbeat and breathing may also be monitored. A normal period of sleep consists of cycles in 5 phases. The first 4 phases are increasingly deeper sleep called Non- Rapid Eye Movement (NREM) sleep,followed by a fifth period of Rapid Eye Movement (REM) sleep
Lizenzart: Lizenzpflichtig
Credit: Science Photo Library / Greim, John
Bildgröße: 3381 px × 4919 px
Modell-Rechte: vorhanden
Eigentums-Rechte: nicht erforderlich
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