Psyche and the Split Brain

In the individuals, the split brained individuals that you studied, there was a disconnection between the two hemispheres. So when the corpus colossum was split, based on doctor sparry's a research on monkeys, he was originally trained as an anatomist, it stopped the spread of epilepsy. And from that, having split the brain, we then could, for the first time, realize the cognitive function of the two Hemispheres.