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states and brain states are held to be two versions, in two different languages, of one and the same original, in either case it is laid down that, could we penetrate into the inside of a brain at work and behold the dance of the atoms which make up the cortex, and if, on the other hand, we possessed the key to psycho-physiology, we should know every detail of what is going on in the corresponding consciousness.

      This, indeed, is what is most commonly maintained by philosophers as well as by men of science. Yet it would be well to ask whether the facts, when examined without any preconceived idea, really suggest an hypothesis of this kind. That there is a close connexion between a state of consciousness and the brain we do not dispute. But there is also a close connexion between a coat and the nail on which it hangs, for, if the nail is pulled out, the coat falls to the ground. Shall we say, then, that the shape of the nail gives us the shape of the coat, or in any way corresponds to it? No more are we entitled to conclude, because the physical fact is hung on to a cerebral state, that there is any parallelism between the two series psychical and physiological. When philosophy pleads that the theory of parallelism is borne out by the results of positive science, it enters upon an unmistakably vicious circle; for, if science interprets connexion, which is a fact, as signifying parallelism, which is an hypothesis (and an hypothesis to which it is difficult to attach an intelligible meaning), it does so, consciously or unconsciously, for reasons of a philosophic order : it is because science has been accustomed by a certain type of philosophy to believe that there is no hypothesis more probable, more in accordance with the interests of scientific enquiry.

      Now, as soon as we do, indeed, apply to positive facts for such information as may help us to solve the problem, we find it is with memory that we have to deal. This was to be expected, because memory — we shall try to prove it in the course of this work — is just the intersection of mind and matter. But we may leave out the reason here: no one, at any rate, will deny that, among all the facts capable of throwing light on the psycho-physiological relation, those which concern memory, whether in the normal or in the pathological state, hold a privileged position. Not only is the evidence here extremely abundant (consider the enormous mass of observations collected in regard to the various kinds of aphasia), but nowhere else have anatomy, physiology and psychology been able to lend each other such valuable aid. Any one who approaches, without preconceived idea and on the firm ground of facts, the classical problem of the relations of soul and body, will soon see this problem as centering upon the subject of memory, and even more particularly upon the memory of words: it is from this quarter, undoubtedly, that will come the light which will illuminate the obscurer parts of the problem.

      The reader will see how we try to solve it. Speaking generally, the psychical state seems to us to be, in most cases, immensely wider than the cerebral state. I mean that the brain state indicates only a very small part of the mental state, that part which is capable of translating itself into movements of locomotion. Take a complex thought which unrolls itself in a chain of abstract reasoning. This thought is accompanied by images, that are at least nascent. And these images themselves are not pictured in consciousness without some foreshadowing, in the form of a sketch or a tendency, of the movements by which these images would be acted or played in space, — would, that is to say, impress particular attitudes upon the body, and set free all that they implicitly contain of spatial movement. Now, of all the thought which is unrolling, this, in our view, is what the cerebral state indicates at every moment. He who could penetrate into the interior of a brain and see what happens there, would probably obtain full details of these sketched-out, or prepared, movements; there is no proof that he would learn anything else. Were he endowed with a superhuman intellect, did he possess the key to psycho-physiology, he would know no more of what is going on in the corresponding consciousness than we should know of a play from the comings and goings of the actors upon the stage.

      That is to say, the relation of the mental to the cerebral is not a constant, any more than it is a simple, relation. According to the nature of the play that is being acted, the movements of the players tell us more or less about it: nearly everything, if it is a pantomime; next to nothing, if it is a delicate comedy. Thus our cerebral state contains more or less of our mental state in the measure that we reel off our psychic life into action or wind it up into pure knowledge.

      There are then, in short, divers tones of mental life, or, in other words, our psychic life may be lived at different heights, now nearer to action, now further removed from it, according to the degree of our attention to life. Here we have one of the ruling ideas of this book-the idea, indeed, which served as the starting-point of our enquiry. That which is usually held to be a greater complexity of the psychical state appears to us, from our point of view, to be a greater dilatation of the whole personality, which, normally narrowed down by action, expands with the unscrewing of the vice in which it has allowed itself to be squeezed, and, always whole and undivided, spreads itself over a wider and wider surface. That which is commonly held to be a disturbance of the psychic life itself, an inward disorder, a disease of the personality, appears to us, from our point of view, to be an unloosing or a breaking of the tie which binds this psychic life to its motor accompaniment, a weakening or an impairing of our attention to outward life. This opinion, as also that which denies the localization of the memory-images of words and explains aphasia quite otherwise than by such localization, was considered paradoxical at the date of the first publication of the present work (1896) . It will appear much less so now. The conception of aphasia then classical, universally admitted, believed to be unshakeable, has been considerably shaken in the last few years, chiefly by reasons of an anatomical order, but partly also by reasons of the same kind as those which we then advanced. And the profound and original study of neuroses made by Professor Pierre Janet has led him, of late years, to explain all psychasthenic forms of disease by these same considerations of psychic 'tension' and of attention to reality which were then presumed to be metaphysical.

      In truth, it was not altogether a mistake to call them by that name. Without denying to psychology, any more than to metaphysics, the right to make itself into an independent science, we believe that each of these two sciences should set problems to the other and can, in a measure, help it to solve them. How should it be otherwise, if psychology has for its object the study of the human mind working for practical utility, and if metaphysics is but this same mind striving to transcend the conditions of useful action and to come back to itself as to a pure creative energy? Many problems which appear foreign to each other as long as we are bound by the letter of the terms in which these two sciences state them, are seen to be very near akin and to be able to solve each other when we thus penetrate into their inner meaning. We little thought, at the beginning of our enquiry, that there could be any connexion between the analytical study of memory and the question, which are debated between realists and idealists or between mechanists and dynamists, with regard to the existence or the essence of matter. Yet this connexion is real, it is even intimate ; and, if we take it into account, a cardinal metaphysical problem is carried into the open field of observation, where it may be solved progressively, instead of for ever giving rise to fresh disputes of the schools within the closed lists of pure dialectic. The complexity of some parts of the present work is due to the inevitable dovetailing of problems which results from approaching philosophy in such a way. But through this complexity, which is due to the complexity of reality itself, we believe that the reader will find his way if lie keeps a fast hold on the two principles which we have used as a clue throughout our own researches. The first is that in psychological analysis we must never forget the utilitarian character of our mental functions, which are essentially turned towards action. The second is that the habits formed in action find their way up to the sphere of speculation, where they create fictitious problems, and that metaphysics must begin by dispersing this artificial obscurity.

      H. Bergson.

      PARIS,

       October, 1910

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