ABSTRACT
In the first edition of this book, I wrote that "the field of psychophysiology is concerned with the measurement of physiological responses as they relate to behavior." The word behavior is used now, as then, in the broadest sense to include such diverse activities as sleep, problem solving, reactions to stress, learning, memory, information processing, perception, or-in short-any of the activities that psychologists are inclined to study. This characterization of the field requires some clarification. You, the reader, may ask how psychophysiology differs from the discipline traditionally known as physiological psychology; the answer is that it is mainly in the approach and subject matter of these areas, because the goal of understanding the physiology of behavior is the same.
