Answer: B. Roger sperry
Explanation:
During 1950s and 1960s, Roger Sperry performed different experiments on cats, monkeys, and humans in order to study the functional differences between the two hemispheres of the brain in the United States. According to him, hemispheres in human brain has different functions. He found out that Hemisphere are not connected and they function independently. The right Hemisphere doesn't interprete message but the left does in humans. His split brain research won a novel prize in physiology or medicine in 1981.