Aristotle the greatest natural philosopher of the ancient world. Born in 384 B.C., Aristotle was a student of Plato (who believed in brain supremacy) and served as a tutor for Alexander the Great. He also was an accomplished animal dissector, having worked on some forty-nine species, ranging from elephants to sea urchins. His cardiocentric -The cardiocentric hypothesis was the historical belief that the heart controls sensation, thought, and body movement.