Sleep research: series of false-colour traces showing brain & muscle activity during rapid eye movement (REM) sleep. 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. Numbering the traces 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. 6 & 7 are electromyograms (EMG) of activity in the laryngeal (6) and neck (7) muscles | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Holmes, James |
Bildgröße: | 3457 px × 2392 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |