Brain during REM sleep. Coloured Positron Emission Tomography (PET) scan of the human brain during REM (rapid eye movement) sleep. Colour-coding depicts active cerebral brain areas (red) through to inactive areas (blue). During the REM sleep phase,the brain is active and dreaming,showing similar activity when awake. In the non-REM phase of sleep the brain is in a deeper,less active sleep. PET scanning shows metabolic activity of the brain. A radioactive tracer (here,radio- labelled glucose) is injected into the bloodstream and absorbed by active tissues of the brain. The PET scanner detects photons emitted by the tracer,to produce a "slice" image of the brain | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Morgan, Hank |
Bildgröße: | 3736 px × 4772 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
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