After years of research on "split-brain" epileptics (epileptics whose corpus collosum--a neural structure linking the two sides of the brain--has been cut to limit seizures to one side of their brain), Sperry discovered that the left brain is responsible for language, logical thinking and analysis. The right brain, on the other hand, seems to be involved with images, imagination and intuition.
史貝利是在多年研究癲癇病人的治療法後發現，左腦是語言的、邏輯性的思考模式，主管分析、理論等理性活動，右腦則是圖像式的思考，主管想像、直覺等感性活動。