Problems of Life and Mind. Second series - George Henry Lewes (thriller books to read txt) 📗

CHAPTER VII.
IS FEELING AN AGENT?

78. Descartes having attributed all animal actions to a sensitive mechanism, and indeed all human actions to a similar mechanism, endeavored to reconcile this hypothesis with the irresistible facts of Consciousness—which assured us that our actions, at least, were determined by Feeling. To this end he assumed that man had a spiritual principle over and above the sentient principle. The operation of this principle was, however, limited to Thought; the actions themselves were all performed by the automatic mechanism; so that, in strict logic, the conclusion from his premises was the same for man as for animals.

This conclusion Professor Huxley announced in his Address before the British Association, 1874222—to the great scandal of the general public, which did not understand him aright; and to the scandal also of a physiological public, which, strangely enough, failed to see that it was the legitimate expression of one of their favorite theories—the celebrated Reflex Theory. Now although it is quite open to any one to reject the premises which lead to such a conclusion, if he sees greater evidence against the conclusion than for the premises, it is surely irrational to accept the premises as those of scientific induction, and yet reject the conclusion because it endangers the stability of other opinions? For my own part, I do not accept the premises, and my polemic will have reference to them.

79. Professor Huxley adopts certain Theses which represent the views generally adopted by physiologists; to which he adds a Thesis which is adopted by few, and which he only puts forward hypothetically. Against these positions I place Antitheses, less generally adopted, but which in my belief approximate more nearly to the inductions of experience.

Theses. Antitheses. I. There can be no sensation without consciousness. I. There is sensation without consciousness, if consciousness means a special mode of Sentience. II. There can be no consciousness without the co-operation of the brain. II. The co-operation of the brain is only necessary for a special mode of Sentience; other modes are active when the brain is inactive. III. Sensation and Consciousness are in some inexplicable way caused by molecular changes in the brain, following upon these as one event follows another, the causal link between motion and sensation being a mystery. III. Unless the molecular changes be limited to the brain as the occasional cause, there is no following of sensation or motion, no causal link between the two; but the neural process is the sensation, viewed objectively, the sensation is the neural process, viewed subjectively. In this antithesis, Neural Process is not limited to the brain, but comprises the whole sensitive organism as the efficient cause. IV. All actions which take place unconsciously are reflex, and reflex actions are the operation of an insentient mechanism; they are therefore as purely mechanical as those of automata. IV. All actions are the actions of a reflex mechanism, and all are sentient, even when unconscious; they are therefore never purely mechanical, but always organical. V. The animal body is a reflex mechanism; even when the brain co-operates with the other centres, and produces consciousness, this product is not an agent in determining action, it is a collateral result of the operation. V. Sentience being necessary to reflex action, it is necessarily an agent.

80. The first four Theses are those current in our textbooks, so that it is only the fifth which will have the air of a paradox. Nor, as a paradox, is it without advocates. Schiff long ago suggested it hypothetically. Hermann mentions it as entertained by physiologists, whom he does not name.223 Laycock, and, if I remember rightly, Dr. Drysdale, have insisted on it; and Mr. Spalding has proclaimed it with iterated emphasis. Of the Antitheses nothing need be said here, since the whole of this volume is meant to furnish their evidence.

I have already stated that my polemic is against the views that Professor Huxley is supposed to hold by those whom his expressions mislead, rather than against the views I imagine him really to hold. I have little doubt that he would disavow much that I am forced to combat, although his language is naturally interpreted in that sense. But I do not know in how far he would agree with me, and in the following remarks I shall confine myself to what seems to be the plain interpretation of his words, since that is the interpretation which has been generally adopted, and which I most earnestly desire to refute.

81. To begin with this passage. After stating the views of Descartes, he says: “As actions of a certain degree of complexity are brought about by mere mechanism, why may not actions of still greater complexity be the result of a more refined mechanism? What proof is there that brutes are other than a superior race of marionnettes, which eat without pleasure, cry without pain, desire nothing, know nothing, and only simulate intelligence as a bee simulates a mathematician?” What proof? Why, in the first place, the proof which is implied in the “more refined mechanism” required for the greater complexity of actions. In the next place, the proof that the organism of the brute is very different from the mechanism of a marionnette, and is so much more like the organism of man, that since we know man to eat with pleasure and cry with pain, there is a strong presumption that the brute eats and cries with somewhat similar feelings.

82. Having stated the hypothesis, Professor Huxley says he is not disposed to accept it, though he thinks it cannot be refuted. His chief reason for not accepting it is that the law of continuity forbids the supposition of any complex phenomenon suddenly appearing; the community between animals and men is too close for us to admit that Consciousness could appear in man without having its beginnings in animals. Finding that animals have brains, he justly concludes that they also must have brain functions; and they also therefore must be credited with Consciousness. This argument seems to me to have irresistible cogency; and to be destructive not only of the automaton hypothesis, but equally of the hypothesis on which the Reflex Theory is founded. If the law of continuity forbids the sudden appearance of Consciousness, the law of similarity of property with similarity of structure forbids the supposition that central nerve-tissue in one part of the system can suddenly assume a totally different property in another part. If the brain of an animal, a bird, a reptile, or a fish—and a fortiori if the œsophageal ganglia of an insect or a mollusc—may be credited with Sensibility, because of the fundamental similarity of these structures with the structures of the human brain, then surely the spinal cord must be credited with Sensibility; for the tissue of the spinal cord is more like that of the brain, than the brain of a reptile is like the brain of a man. The sudden disappearance of all Sensibility, on the removal of one portion of the central nervous system, would be a violation of the law of continuity. And if it be said that Consciousness is not the same as Sensibility, but is a specially evolved function of a specially developed organ, the answer will be that this is only a difference of mode, and that the existence of Sensibility is that which renders the automaton and reflex theories untenable.

83. Professor Huxley would probably admit this; for however his language may at times seem to point to another conclusion, and is so far ambiguous, he has expressed the view here maintained with tolerable distinctness in the following passage, to which particular attention is called:—

“But though we may see reason to disagree with Descartes’ hypothesis, that brutes are unconscious machines, it does not follow that he was wrong in regarding them as automata. They may be more or less conscious sensitive automata; and the view that they are such conscious machines is that which is implicitly or explicitly adopted by most persons. When we speak of the actions of the lower animals being guided by instinct and not by reason, what we really mean is that though they feel as we do, yet their actions are the results of their physical organization. We believe, in short, that they are machines, one part of which (the nervous system) not only sets the rest in motion and co-ordinates its movements in relation with changes in surrounding bodies, but is provided with a special apparatus the function of which is the calling into existence of those states of consciousness which are termed sensations, emotions, and ideas.”

84. To say that they are “conscious automata” seems granting all that I demand; but there are two objectionable positions which the phrase conceals: first, that Consciousness is not a coefficient; and secondly, that Reflex Action is purely mechanical.

Professor Huxley nowhere, I think, establishes the distinction between Consciousness as a term for a special mode of Feeling, and Consciousness as the all-embracing term for sentient phenomena. His language always implies that an action performed unconsciously is performed mechanically; which may be acceptable if by unconsciously be meant insentiently. I hold that whether consciously or unconsciously performed, the action is equally vital and sentient. In the case he has cited of a soldier now living who is subject to periodic alternations of normal and abnormal states, in the latter states all the actions being said to be “unconscious,” we have only to read the account to recognize ample evidence of Sentience. Here is a descriptive passage:—

85. “His [the soldier’s in the abnormal state] movements remain free, and his expression calm, except for a contraction of the brow, an incessant movement of the eyeballs, and a chewing motion of the jaws. The eyes are wide open, and their pupils dilated. If the man happens to be in a place to which he is accustomed he walks about as usual; but if he is in a new place, or if obstacles are intentionally placed in his way, he stumbles against them, stops, and then feeling over the objects with his hands, passes on one side of them. He offers no resistance to any change of direction which may be impressed upon him, or to the forcible acceleration or retardation of his movements. He eats, drinks, smokes, walks about, dresses and undresses himself, rises and goes to bed at the accustomed hours. Nevertheless pins may be run into his body, or strong electric shocks sent through it, without causing the least indication of pain; no odorous substance, pleasant or unpleasant, makes the least impression; he eats and drinks with avidity whatever is offered, and takes asafœtida or vinegar of quinine as readily as water; no noise affects him; and light influences him only under certain conditions.”

There is no one of