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.
Well, according to Mental Floss, there's a science behind it: Dogs are trying to tell us that they care (heart melts instantly). Apparently, when a dog tilts its head, it's a symbol that they are showing us empathy and that they are engaged. It's not surprising, really, as we all know how in tune with our emotions dogs can be.