If we consider the human mind principally under its intellectual aspect—i.e., insofar as it knows and thinks, deducting its emotions and voluntary activity—the observation of individuals distinguishes some very clear varieties of mentality.
First, those of a "positive" or realistic turn of mind, living chiefly on the external world, on what is perceived and what is immediately deducible therefrom—alien or inimical to vain fancy; some of them flat, limited, of the earth earthy; others, men of action, energetic but limited by real things.
Second, abstract minds, "quintessence abstractors," with whom the internal life is dominant in the form of combinations of concepts. They have a schematic representation of the world, reduced to a hierarchy of general ideas, noted by symbols. Such are the pure mathematicians, the pure metaphysicians. If these two tendencies exist together, or, as happens, are grafted one on the other, without anything to counterbalance them, the abstract spirit attains its perfect form.
Midway between these two groups are the imaginers in whom the internal life predominates in the form of combinations of images, which fact distinguishes them clearly from the abstractors. The former alone interest us, and we shall try to trace this imaginative type in its development from the normal or average stage to the moment when ever-growing exuberance leads us into pathology.
The explanation of the various phases of this development is reducible to a well-known psychologic law—the natural antagonism between sensation and image, between phenomena of peripheral origin and phenomena of central origin; or, in a more general form, between the outer and inner life. I shall not dwell long on this point, which Taine has so admirably treated.[149] He has shown in detail how the image is a spontaneously arising sensation, one that is, however, aborted by the opposing shock of real sensation, which is its reducer, producing on it an arresting action and maintaining it in the condition of an internal, subjective fact. Thus, during the waking hours, the frequency and intensity of impressions from without press the images back to the second level; but during sleep, when the external world is as it were suppressed, their hallucinatory tendency is no longer kept in check, and the world of dreams is momentarily the reality.
The psychology of the imaginer reduces itself to a progressively increasing interchange of rôles. Images become stronger and stronger states; perceptions, more and more feeble. In this movement opposite to nature I note four steps, each of which corresponds to particular conditions: (1) The quantity of images; (2) quantity and intensity; (3) quantity, intensity and duration; (4) complete systematization.
(1) In the first place the predominance of imagination is marked only by the quantity of representations invading consciousness; they teem, break apart, become associated, combine easily and in various ways. All the imaginative persons who have given us their experiences either orally or in writing agree in regard to the extreme ease of the formation of associations, not in repeating past expedience, but in sketching little romances.[150] From among many examples I choose one. One of my correspondents writes that if at church, theatre, on a street, or in a railway station, his attention is attracted to a person—man or woman—he immediately makes up, from the appearance, carriage and attractiveness his or her present or past, manner of life, occupation—representing to himself the part of the city he or she must dwell in, the apartments, furniture, etc.—a construction most often erroneous; I have many proofs of it. Surely this disposition is normal; it departs from the average only by an excess of imagination that is replaced in others by an excessive tendency to observe, to analyze, or to criticise, reason, find fault. In order to take the decisive step and become abnormal one condition more is necessary—intensity of the representations.
2. Next, the interchange of place, indicated above, occurs. Weak states (images) become strong; strong states (perceptions) become weak. The impressions from without are powerless to fulfill their regular function of inhibition. We find the simplest example of this state in the exceptional persistence of certain dreams. Ordinarily, our nocturnal imaginings vanish as empty phantasmagorias at the inrush of the perceptions and habits of daily life—they seem like faraway phantoms, without objective value. But, in the struggle occurring, on waking, between images and perceptions, the latter are not always victorious. There are dreams—i.e., imaginary creations—that remain firm in face of reality, and for some time go along parallel with it. Taine was perhaps the first to see the importance of this fact. He reports that his relative, Dr. Baillarger, having dreamt that one of his friends had been appointed editor of a journal, announced the news seriously to several persons, and doubt arose in his mind only toward the end of the afternoon. Since then contemporary psychologists have gathered various observations of this kind.[151] The emotional persistence of certain dreams is known. So-and-so, one of our neighbors, plays in a dream an odious rôle; we may have a feeling of repulsion or spite toward him persisting throughout the day. But this triumph of the image, accidental and ephemeral in normal man, is frequent and stable in the imaginers of the second class. Many among them have asserted that this internal world is the only reality. Gérard de Nerval "had very early the conviction that the majority is mistaken, that the material universe in which it believes, because its eyes see it and its hands touch it, is nothing but phantoms and appearances. For him the invisible world, on the contrary, was the only one not chimerical." Likewise, Edgar Allan Poe: "The real things of the world would affect me like visions, and only so; while the wild ideas of the land of dreams became in turn not only the feeding ground of my daily existence but positively the sole and entire existence itself." Others describe their life as "a permanent dream." We could multiply examples. Aside from the poets and artists, the mystics would furnish copious examples. Let us take an exaggerated instance: This permanent dream is, indeed, only a part of their existence; it is above all active through its intensity; but, while it lasts, it absorbs them so completely that they enter the external world only with a sudden, violent and painful shock.
(3) If the changing of images into strong states preponderating in consciousness is no longer an episode but a lasting disposition, then the imaginative life undergoes a partial systematization that approaches insanity. Everyone may be "absorbed" for a moment; the above-mentioned authors are so frequently. On a higher level this invading supremacy of the internal life becomes a habit. This third degree is but the second carried to excess.
Some cases of double personality (those of Azam, Reynolds) are known in which the second state is at first embryonic and of short duration; then its appearances are repeated, its sphere becomes extended. Little by little it engrosses the greater part of life; it may even entirely supplant the earlier self. The growing working of the imagination is similar to this. Thanks to two causes acting in unison, temperament and habit, the imaginative and internal life tends to become systematized and to encroach more and more on the real, external life. In an account by Féré[152] one may follow step by step this work of systematization which we abridge here to its chief characteristics.