brain laterilazation

When reading about Brain Lateralization i am utterly amazed at how a person can survive almost without change to everyday life even after having their corpus callosum severed. As is commonly known amongst neurologists' and psychologists' the corpus callosum sends messages from one hemisphere to the other but when that is no longer available it must resort to external communication. for example when flashing two different words to each side of the eyes a "split-brain" person will draw one word out and point to another word or write it down and once it is in front of them in paper, then at that point they make the association  between the two words. At first i thought there would be a much confusion between the two hemispheres but auditory signals are able to reach both hemispheres well so that helps tie a few things together as far as cognitive functions are concerned. a few concepts in the book seemed a bit murky and when i saw the following video it helped clear things up, hopefully it aids you as well