Raymond Martin

“Plato launched an empirical psychology, the first of its kind in the West. Others, prior to Plato, tended to make proposals about what sort of matter the soul is made of—air, earth, fire, or water. No one had proposed a theory about how the different parts of a human personality work together to produce human behavior. This sort of thing is what today is called a faculty psychology. It is called this because it posits separate mechanisms—or faculties—in the mind (or body) whose function it is to control different aspects of human mentality. Faculty psychologies are contrasted with functional psychologies, which explain different aspects of human mentality not by assigning them to different mechanisms in the mind or brain but rather to different ways in which a single organ of mentality functions. Aristotle, and then various thirteenth- and fourteenth-century thinkers, wavered between these two views. Recently, with the advent in cognitive psychology of modular theories of human mentality, a modern descendant of Plato’s faculty psychology has come back into fashion.”
― Raymond Martin, The Rise and Fall of Soul and Self: An Intellectual History of Personal Identity