Davies cites a remarkable case of sudden loss of memory in a man who, while on his way to Australia, was found by the police in an exhausted condition and who was confined in the Kent County Insane Asylum. He suffered absolute loss of all memory with the exception of the names of two men not close acquaintances, both of whom failed to recognize him in his changed condition in confinement. Four months later his memory returned and his identity was established.
In the Revue Philosophique for 1885 there are the details of a case of a young man who seemed able to assume six states of what might be fairly called different personalities. The memories attached to each of these states were very different, though only one was completely exclusive of the others. The handwriting varied from complete competence to complete incompetence. His character varied between childish timidity, courteous reserve, and reckless arrogance; and to four of his conditions there was a form of hysteric paralysis attached. Mere suggestion would not only induce any one of these varied forms of paralysis, but also the memories, capacities, and characters habitually accompanying it.
A young man named Spencer, an inmate of the Philadelphia Hospital, was exhibited before the American Neurological Society in June, 1896, as an example of dual personality. At the time of writing he is and has been in apparently perfect health, with no evidence of having been in any other condition. His faculties seem perfect, his education manifests itself in his intelligent performance of the cleric duties assigned to him at the hospital, yet the thread of continuous recollection which connects the present moment with its predecessors--consciousness and memory--has evidently been snapped at some point of time prior to March 3d and after January 19th, the last date at which he wrote to his parents, and as if in a dream, he is now living another life. The hospital staff generally believe that the man is not "shamming," as many circumstances seem to preclude that theory.
His memory is perfect as to everything back to March 3d. The theory of hypnotism was advanced in explanation of this case.
The morbid sympathy of twin brothers, illustrated in Dumas's "Corsican Brothers," has been discussed by Sedgwick, Elliotson, Trousseau, Laycock, Cagentre, and others. Marshall Hall relates what would seem to verify the Corsican myth, the history of twin brothers nine months of age, who always became simultaneously affected with restlessness, whooping and crowing in breathing three weeks previous to simultaneous convulsions, etc. Rush describes a case of twin brothers dwelling in entirely different places, who had the same impulse at the same time, and who eventually committed suicide synchronously. Baunir describes a similar development of suicidal tendency in twin brothers. Apeculiar case of this kind was that of the twin brothers Laustand who were nurses in a hospital at Bordeaux; they invariably became ill at the same time, and suffered cataract of the lens together.
Automatism has been noticed as a sequel to cranial injuries, and Huxley quotes a remarkable case reported by Mesnet. The patient was a young man whose parietal bone was partially destroyed by a ball. He exhibited signs of hemiplegia on the right side, but these soon disappeared and he became subject to periodic attacks lasting from twenty-four to forty-eight hours, during which he was a mere automaton. In these attacks he walked continually, incessantly moving his jaw, but not uttering a word. He was insensible to pain, electric shock, or pin-prick. If a pen was placed in his hand he would write a good letter, speaking sensibly about current topics. When a cigarette-paper was placed in his hand he sought his tobacco box, and adroitly rolled a cigarette and lighted it. If the light went out he procured another, but would not allow another to substitute a match. He allowed his mustache to be burned without resistance, but would not allow a light to be presented to him. If chopped charpie was put in his pocket instead of tobacco he knew no difference. While in his periods of automatism he was in the habit of stealing everything within his grasp. He had been a concert singer, and a peculiar fact was that if given white gloves he would carefully put them on and commence a pantomime of the actions of a singer, looking over his music, bowing, assuming his position, and then singing.