Brain during deep sleep. Colour Positron Emission Tomography (PET) scan of the human brain during deep sleep. The colour-coding depicts active cerebral brain areas (yellow) through to inactive areas (purple). The brain is inactive,undergoing a deep sleep during the phase of NREM (non-rapid eye movement) or "non-dreaming" sleep. When dreaming,the brain is more active than this. PET scanning shows the 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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Morgan, Hank |
Taille de l’image : | 3650 px × 4893 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
|