The most important aspect of split-brain research is not that specific areas in the brain perform specific tasks but that in undertaking most physical and mental activities, the intricate integration of both hemispheres is fundamental. Smaller communicating commissures in the brainstem (e.g., left and right superior colliculi) are not cut in split-brain operations. (Dauphin, Bridget. Understanding Brain Specialization Through Split-Brain ResearchArticle.)