Wheb your corpus collosum is severed your two brain hemispheres cannot directly interact with each other. Since they control desperate motor functions they can each learn something the other half doesnt know and cant describe (i.e. the side that controls the eye that saw an egg knows it saw an egg. But the other side that controls verbal communication cant say what it saw because it doesn know) over time the sides can even disagree or form differing opinions. So which side is you?