The phenomenon of dreaming has rarely been discussed or investigated in a thorough and in an experimental manner; of description, of theory, of discu… - Mary Whiton Calkins

All psychologists would agree to define their subject, at least in an introductory way, as the science of consciousness. But this definition is not enlightening unless its terms are thoroughly understood, and we must at once, therefore, proceed to discuss the nature of a science.

Psychology has most often been defined as science of consciousness, but this definition does not go far enough. For consciousness does not occur impersonally. Consciousness, on the contrary, always is a somebody-being-conscious. There is never perception without a somebody who perceives, and there never is thinking unless some one thinks. And this somebody is not an isolated self but a self which is affected from without and which expresses itself in its behavior. In view of these facts psychology is more exactly defined as science of the self in relation to, or conscious of, its environment.

Any serious attempt to define and to classify forms of consciousness will act as a "red flag" waved in the face of many critics. The effort to define accurately and to classify in any detail is bound, they will urge, to result in a conservative clinging to conclusions once reached and in a love of schedules and schemes for their own sake. The system maker, they will insist, is likely to subordinate the facts to his classification and to cut down the truth to the measure of his framework.