The defective sensibility of the degenerate, confirmed by all observers, is, moreover, susceptible of different interpretations. Whereas many consider it a consequence of the pathological condition of the sensory nerves, others believe that the perturbation has its seat, not in these nerves, but in the brain; not in the ducts, but in the centres of perception. To quote one of the most eminent among the psycho-physiologists of the new school, Binet[245] has proved that, ‘if a portion of the body of a person is insensible, he is ignorant of what passes there; but, on the other hand, the nervous centres in connection with this insensible region can continue to act; the result is that certain acts, often simple, but sometimes very complicated, can be accomplished in the body of a hysterical subject, without his knowledge; much more, these acts can be of a psychical nature, and manifest an intelligence which will be distinct from that of the subject, and will constitute a second “I” co-existent with the first. For a long time there was a misconception of the true nature of hysterical anæsthesia, and it was compared to a common anæsthesia from organic causes, due, for example, to the interruption of afferent nerves. This view must be wholly abandoned, and we know now that hysterical anæsthesia is not a true insensibility; it is insensibility from unconsciousness from mental disaggregation; in a word, it is psychical insensibility.’
Most frequently it is not a question of simple cases, where it is the sensory nerves alone, or only the cerebral centres which work badly, but of mixed cases, where the two apparatuses have a diversely varying part in the disturbance. But whether the nerves do not conduct the impressions to the brain, or the brain does not perceive, or does not raise the impressions brought to it into consciousness, the result is always the same, viz., the external world will not be correctly and distinctly grasped by consciousness, the ‘not-I’ will not be suitably represented in consciousness, the ‘I’ will not experience the necessary derivation of the exclusive preoccupation with the processes taking place in its own organism.
The natural healthy connection between organic sensations and sense-perceptions is much more strongly displaced when to the insensibility of the sensory nerves, or of the centres of perception, or both, is added an unhealthily modified and intensified vital activity of the organs. Then the organic ego-sensibility, or cœnæsthesis, advances irrepressibly into the foreground, overshadowing in great part or wholly the perceptions of the external world in consciousness, which no longer takes notice of anything but the interior processes of the organism. In this way there originates that peculiar hyper-stimulation or emotionalism constituting, as we have seen, the fundamental phenomenon of the intellectual life of the degenerate. For the fundamental emotional tone, despairing or joyful, angry or tearful, which determines the colour of his presentations as well as the course of his thoughts, is the consequence of phenomena taking place in his nerves, vessels and glands.[246] The consciousness of the emotionally degenerate subject is filled with obsessions which are not inspired by the events of the external world, and by impulsions which are not the reaction against external stimulation. To this is added next the unfailing weakness of will of the degenerate person, which makes it impossible for him to suppress his obsessions, to resist his impulsions, to control his fundamental moods, to keep his higher centres to the attentive pursuit of objective phenomena. According to the saying of the poet, the necessary result of these conditions is that the world must be differently reflected in such heads than it is in normal ones. The external world, the ‘not-I,’ either does not exist at all in the consciousness of an emotionally degenerate subject, or it is merely represented there as on a faintly reflecting surface, by a scarcely recognisable, wholly colourless image, or, as in a concave or convex mirror, by a completely distorted, false image; consciousness, on the other hand, is imperiously monopolized by the somatic ‘I,’ which does not permit the mind to be occupied with anything but the painful or tumultuous processes taking place in the depths of the organs.