(1) Amnesia of speech.
(2) Amnesia of speech and written language.
(3) Amnesia of speech, written language, and gesture.
In most cases there is no paralysis of the tongue or speech-forming organs. As a rule the intellect is unaffected, the patient has the ideas, but lacks the power to give them proper expression through words, written language, or gesture. If the patient is enable to write, the condition is known as agraphia. Word-blindness, word-deafness, etc., are terms of different forms of aphasia.
What was probably a case of incomplete aphasia is mentioned by Pliny, that of Messala Corvinus who was unable to tell his own name; and many instances of persons forgetting their names are really nothing but cases of temporary or incomplete aphasia. In some cases of incomplete and in nearly all cases of complete aphasia, involuntary sentences are ejaculated. According to Seguin a reverend old gentleman affected with amnesia of words was forced to utter after the sentence, "Our Father who art in heaven," the words "let Him stay there." A lady seen by Trousseau would rise on the coming of a visitor to receive him with a pleased and amiable expression of countenance, and show him to a chair, at the same time addressing to him the words, "cochon, animal, fichue bete," French words hardly allowable in drawing-room usage. She was totally aphasic but not paralyzed. Women often use semi-religious expressions like "Oh dear," or "Oh Lord." Men of the lower classes retain their favorite oaths remarkably. Sometimes the phrases ejaculated are meaningless, as in Broca's celebrated case.
Aphasia may be the result of sudden strong emotions, in such cases being usually temporary; it may be traumatic; it may be the result of either primary or secondary malnutrition or degeneration.
There are some cases on record in which the sudden loss and the sudden return of the voice are quite marvelous.
Habershon reports the case of a woman who on seeing one of her children scalded fell unconscious and motionless, and remained without food for three days. It was then found that she suffered from complete aphasia. Five weeks after the incident she could articulate only in a very limited vocabulary.
In the Philosophical Transactions Archdeacon Squire tells of the case of Henry Axford, who lost the power of articulation for four years; after a horrible dream following a debauch he immediately regained his voice, and thereafter he was able to articulate without difficulty.
Ball records a curious case of what he calls hysteric aphonia. The patient was a young lady who for several months could neither sing nor speak, but on hearing her sister sing a favorite song, she began to sing herself; but, although she could sing, speech did not return for several weeks. Ball remarks that during sleep such patients may cry out loudly in the natural voice.