To reduce the severity of his seizures, Joe had the bridge between his left and right cerebral hemisphers (the corpus callosum) severed. As a result, his left and right brains no longer communicate through that pathway. This is an extraordinary insight into the machinary of the mind. Here’s what happens as a result:
Biosingularity 
That’s simply incredible!
Evolution builds from the bottom up,so it makes sense that the brain is lots of independent parts working separately. The human brain is remarkable on its own, but within a collaborative species it is awesome.