ABSTRACT
It is not much of an exaggeration to say that all behavior involves choice. Even in the most barren experimental chamber, an animal can choose among performing the operant response, exploring, sitting, standing, grooming, sleeping, and so on. Outside the laboratory, the choices are much more numerous. At any moment, an individual can choose to either continue with its current behavior or switch to another. Because both people and animals are constantly making choices, understanding choice is an essential part of understanding behavior itself.
