Sleep research: series of false-colour traces showing typical brain & muscle activity in a subject who is awake. Numbered from top to bottom,1 & 2 are electroencephalograms (EEG) of brain activity; 3 is an electrooculogram (EOG) of movement in the right eye; 4 an EOG of the left eye; 5 is an electrocardiogram (ECG) trace of heart activity. Finally,6 & 7 are electromyograms (EMG) showing activity in the laryngeal (6) and neck (7) muscles. Sleep comprises cycles of 5 distinct stages; 1-4 are stages of increasingly deeper sleep known as non-rapid eye movement (NREM),and a 5th stage of lighter,rapid eye movement (REM) sleep | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Holmes, James |
Bildgröße: | 4861 px × 3307 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |