Excerpt from Symptomatology, Psychognosis, and Diagnosis of Psychopathic Diseases

We are getting more and more awake to the importance of the study of the phenomena of abnormal mental life. The student of normal psychology begins to realize the necessity of a knowledge of the various manifestations of the abnormal mind, both conscious and subconscious. The phenomena that lie on the borderland of what is regarded as normal mental activity are of great interest and importance, because, being deviations or variations from the normal and the familiar, they are apt to call attention to the mechanism, causation, and laws that govern mental activity in general, normal and abnormal, conscious and subconscious.

The normal psychologist has learned to pay attention to the facts of abnormal mental life, since a knowledge of them sheds a good deal of light on the various manifestations with which he himself deals, manifestations which have resisted psychological analysis, such as emotion, will, personality, and even such apparently simple mental functions as associative processes and perception. Not that the normal psychologist has not made important contributions to the understanding of all those processes, but many of the studies touched the surface, and did not penetrate deep into the subsoil of mental life, into the subconscious activity where all the sources of mental life have their being, where mental processes have their origin, and whence all mental processes come to light in the focus of consciousness.

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