The scientific study of motivation as a discipline separate from learning began in the 1930s. Early motivation researchers were primarily interested in the factors that aroused behavior, or that got it started in the first place. It was widely believed at the time that the optimal state of an organism, both animal and human, was one of balance and equilibrium, where all needs were satisfied. The process of keeping the organism at this optimal level is known as homeostasis. Homeostatic balance was also thought to be satisfying, which was compatible with the belief that organisms were primarily motivated by hedonism, or the desire to maximize pleasure and minimize pain. Theories of motivation that emerged in the 1930s were based on the ideas of homeostasis and hedonism as fundamental principles.
