REGIONAL CEREBRAL BLOOD FLOW (RCBF RCBF): Regional cerebral blood flow monitoring may help boost the validity of the regional localization theory, in which specific parts of the brain control specific functions.. measure of the blood flow in a specific area of the brain, using positron emission tomography (PET scans) and/or single photon emission computed tomography.
If a dog goes on his back to you he is accepting you as his master. This is part of the answer but here's a little more in-depth version as reported by USA Today. In general, dogs lie on their back for three reasons.
In any event, one of the things I have found provides the most relief, particularly in the morning or after sitting at a desk a long time, is the downward dog yoga pose â it doesnt stretch the neck muscles so much but allows them to relax and helps stretch out my back (or back line from an anatomy trains perspective).