The Relationship Between the Right and Left Hemisphere

The two hemispheres act independently. To some degree, you can communicate with each of them somewhat independently. They actually view the world quite differently and that hemisphere distinction is not only there in human beings, but also in animals a long way down the phylogenetic chain. There's reasons for that. Part of the reason is that if your theory you've worked on for 10 years makes one prediction error, you shouldn't throw the whole damn thing out because you never know when your data is actually data or is just another kind of theory.