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In this book the author attempts to integrate and systematize his previous work on the mathematical analysis of behavior. After an able introduction on the heuristic validity of "symbolic constructs" the author proceeds to assign specific symbols to various conative and integrative factors in behavior, such as (S) for "environmental energies," (SUR) for "unlearned recepter-effector-connections" and (SHR) for "habit." These and many other symbols are then combined into equations derived mainly from animal experimental data. In essence the formulas are designed to cover the consequences of the basic postulates that the behavior of an organism with a given neural organization depends "(1) upon the state of disequilibrium or need of the organism and (2) upon the characteristics of the environment, external and internal." Motivation is thus not neglected, but it is attributed to "hormone-like substances" and equated with various combinations of "potentiality of response evocation (S
Principles of Behavior: An Introduction to Behavior Theory. JAMA. 1944;124(2):131. doi:10.1001/jama.1944.02850020061030