. The practice of medicine; a text-book for practitioners and students, with special reference to diagnosis and treatment . ampalgyri, and mind ageusia probably as in anosmia. 958 DISEASES OF THE NERVOUS SYSTEM Aphasia, or Loss of the Faculty of Speech. Aphasia is sensory or motor according as it is caused by a loss ofmemory of words, or by an inability to enunciate—according as it isthe receptive or the emissive center which is at fault. Sensory Aphasia. Including Word-blindness, Word-deafness, AmnesicAphasia.—By word-blindness is meant loss of the memory of the ap-pearance of a word. In this
. The practice of medicine; a text-book for practitioners and students, with special reference to diagnosis and treatment . ampalgyri, and mind ageusia probably as in anosmia. 958 DISEASES OF THE NERVOUS SYSTEM Aphasia, or Loss of the Faculty of Speech. Aphasia is sensory or motor according as it is caused by a loss ofmemory of words, or by an inability to enunciate—according as it isthe receptive or the emissive center which is at fault. Sensory Aphasia. Including Word-blindness, Word-deafness, AmnesicAphasia.—By word-blindness is meant loss of the memory of the ap-pearance of a word. In this condition the patient does not recognizewords which he sees on the written or printed page, and although he maybe able to pronounce them after hearing them or write them at dictationor copy them, he does not understand what he reads or writes. On theother hand, figures are sometimes recalled when words are forgottten,and the patient may even be able to solve mathematical problems andto recognize playing-cards. Word-blindness may occur alone or withmotor aphasia. The lesion in most cases of word-blindness has been. Fig. i68.—Situations of Lesions Causing Aphasia—{after Starr).f. First frontal convolution. F^. Second frontal. F^ Third frontal. TK First temporalT^. Second temporal. T\ Third temporal. PK First parietal. P^ Second Lesion of v/ord-deafness and deafness for musical sounds, or mind-deafness, accordingto M. AUen Starr. 2. Lesion of mind-blindness and woTd-hlindiiess, according to Lesion of motor aphasia. 4. Supposed lesion of agraphia. in the angular and supramarginal gyri on the left side, as located by Ferricr,but this area is not believed by all to be the center for word-seeing. Alexia,or inability to read, is a corollary growing out of this, as is also agraphia,or inability to write, so far as it depends on sight. It is often associated,as already stated, with mind-blindness, but may occur independentlyof it. Word-deafness is a condit
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