Final answer:
Sperry and Gazzaniga's split brain research demonstrated that split-brain patients can perform two independent tasks simultaneously, unlike people with an intact corpus callosum. The research also revealed the dominance of the left cerebral hemisphere in most people.
Step-by-step explanation:
Sperry and Gazzaniga's split brain research involved studying patients who had their corpus callosum cut, separating their two cerebral hemispheres. They found that these split-brain patients could perform two independent tasks simultaneously, whereas people with an intact corpus callosum cannot overcome the dominance of one hemisphere over the other. This research provided insights into the unique functions of the two hemispheres and helped reveal the dominance of the left cerebral hemisphere in most people.