On this problem, I say, the phenomena of automatic script, of trance-utterance, of spirit-possession, throw more of light than we could have ventured to hope.
Stated broadly, our trance-phenomena show us to begin with that several currents of communication can pass at once from discarnate spirits to a living man;—and can pass in very varying ways. For clearness' sake I will put aside for the present all cases where the telepathic impact takes an externalised or sensory form, and will speak only of intellectual impressions and motor automatisms.
Now these may pass through all grades of apparent centrality. If a man, awake and in other respects fully self-controlled, feels his hand impelled to scrawl words on a piece of paper, without consciousness of motor effort of his own, the impulse does not seem to him a central one, although some part of his brain is presumably involved. On the other hand, a much less conspicuous invasion of his personality may feel much more central;—as, for instance, a premonition of evil,—an inward heaviness which he can scarcely define. And so the motor automatism goes on until it reaches the point of possession;—that is to say, until the man's own consciousness is absolutely in abeyance, and every part of his body is utilised by the invading spirit or spirits. What happens in such conditions to the man's ruling principle—to his own spirit—we must consider presently. But so far as his organism is concerned, the invasion seems complete: and it indicates a power which is indeed telepathic in a true sense;—yet not quite in the sense which we originally attached to the word. We first thought of telepathy as of a communication between two minds, whereas what we have here looks more like a communication between a mind and a body,—an external mind, in place of the mind which is accustomed to rule that particular body.
There is in such a case no apparent communication between the discarnate mind and the mind of the automatist. Rather there is a kind of contact between the discarnate mind and the brain of the automatist, in so far that the discarnate mind, pursuing its own ends, is helped up to a certain point by the accumulated capacities of the automatist's brain;—and similarly is hindered by its incapacities.
Yet here the most characteristic element of telepathy, I repeat, seems to have dropped out altogether. There is no perceptible communion between the mind of the entranced person and any other mind whatever. He is possessed, but is kept in unconsciousness, and never regains memory of what his lips have uttered during his trance.
But let us see whether we have thus grasped all the trance-phenomena;—whether something else may not be going on, which is more truly, more centrally telepathic.
To go back to the earliest stage of telepathic experience, we can see well enough that the experimental process might quite possibly involve two different factors. The percipient's mind must somehow receive the telepathic impression;—and to this reception we can assign no definite physical correlative;—and also the percipient's motor or sensory centres must receive an excitation;—which excitation may be communicated, for aught we know, either by his own mind in the ordinary way, or by the agent's mind in some direct way,—which I may call telergic, thus giving a more precise sense to a word which I long ago suggested as a kind of correlative to telepathic. That is to say, there may even in these apparently simple cases be first a transmission from agent to percipient in the spiritual world, and then an action on the percipient's physical brain, of the same type as spirit-possession. This action on the physical brain may be due either to the percipient's own spirit, or subliminal self, or else directly to the agent's spirit. For I must repeat that the phenomena of possession seem to indicate that the extraneous spirit acts on a man's organism in very much the same way as the man's own spirit habitually acts on it. One must thus practically regard the body as an instrument upon which a spirit plays;—an ancient metaphor which now seems actually our nearest approximation to truth.
Proceeding to the case of telepathic or veridical apparitions, we see the same hints of a double nature in the process;—traces of two elements mingling in various degrees. At the spiritual end there may be what we have called "clairvoyant visions,"—pictures manifestly symbolical, and not located by the observer in ordinary three-dimensional space. These seem analogous to the views of the spiritual world which the sensitive enjoys during entrancement. Then comes that larger class of veridical apparitions where the figure seems to be externalised from the percipient's mind, some stimulus having actually been applied,—whether by agent's or percipient's spirit,—to the appropriate brain-centre. These cases of "sensory automatism" resemble those experimental transferences of pictures of cards, etc. And beyond these again, on the physical or rather the ultra-physical side, come those collective apparitions which in my view involve some unknown kind of modification of a certain portion of space not occupied by any organism,—as opposed to a modification of centres in one special brain. Here comes in, as I hold, the gradual transition from subjective to objective, as the portion of space in question is modified in a manner to affect a larger and larger number of percipient minds.
Now when we proceed from these apparitions of the living to apparitions of the departed, we find very much the same types persisting still. We find symbolical visions of departed persons, and of scenes among which they seem to dwell. We find externalised apparitions or phantasms of departed persons,—indicating that some point in the percipient's brain has been stimulated by his own or by some other spirit. And finally, as has already been said, we find that in certain cases of possession these two kinds of influence are simultaneously carried to an extreme. The percipient automatist of earlier stages becomes no longer a percipient but an automatist pure and simple,—so far as his body is concerned,—for his whole brain—not one point alone—seems now to be stimulated and controlled by an extraneous spirit, and he is not himself aware of what his body writes or utters. And meantime his spirit, partially set free from the body, may be purely percipient;—may be enjoying that other spiritual form of communication more completely than in any type of vision which our description had hitherto reached.
This point attained, another analogy, already mentioned, will be at once recalled. There is another class of phenomena, besides telepathy, of which this definition of possession at once reminds us. We have dealt much with secondary personalities,—with severances and alternations affecting a man's own spirit, in varying relation with his organism. Félida X.'s developed secondary personality, for instance (Appendix II. C), might be defined as another fragment—or another synthesis—of Félida's spirit acting upon her organism in much the same way as the original fragment—or the primary synthesis—of her spirit was wont to act upon it.