He was a philosopher and psychologist, but was most well known in the field of psychology for developing the philosophy of pragmatism, or the functionalist theory: "Theory of mental life and behavior that is concerned with how an organism uses its perceptual abilities to function in its environment." ... Numerous chapters in Principles were devoted to habit, attention, perception, association, memory, reasoning, instinct, emotion, imagination, psychological methods, and even hypnotism. ... He says that when habits are formed something is changed in the nervous system so that every time we re...

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