Nervous and mental diseases . o complex. There is no word-deafness. Reading is notably impaired and in the same degree as association of visual speech Avith motor speech is a close one. Allin learning to read pronounce as they go along, and even in after-life,when one is reading carefully, the tongue will be found slightly movingin the mouth in the same manner that the words would require werethey pronounced. Yet many of these patients will intently scan thepapers for hours or apparently read and reread the same books and in-sist that they understand what they read. They almost inv
Nervous and mental diseases . o complex. There is no word-deafness. Reading is notably impaired and in the same degree as association of visual speech Avith motor speech is a close one. Allin learning to read pronounce as they go along, and even in after-life,when one is reading carefully, the tongue will be found slightly movingin the mouth in the same manner that the words would require werethey pronounced. Yet many of these patients will intently scan thepapers for hours or apparently read and reread the same books and in-sist that they understand what they read. They almost invariably rec-ognize their own names, and in some cases seem to get the ^^drift ofwhat they read. Motor aphasics showing a high degree of verbal difficulty are theones in whom amimia and paramimia (apraxia) are usually they cannot voluntarily protrude the tongue. Visual Aphasia.—A lesion destroying the angular gyre on the leftside produces the peculiar defect of visual aphasia, or word-blindness. Fig. 75.—A lesion (X) divides the optic radiations within the occipital lobe, producing hemianopsia and word-blindness at once (Dejeiine). If this lesion extends deeply enough to involve the optic radiationsstreaming from the basal ganglia to the occipital cortex, hemianopsia isadded. A lesion in the optic radiation within the white matter of theoccipital lobe may involve the connecting tracts between the half-visioncenters in the apex and the higher visual centers in the angular gyre,producing both hemianopsia and word-blindness. It thus appears thatword-blindness is due to disturbance of the angular gyre alone, and thatassociated hemianopsia is present only when the lesion implicates theoptic radiation (see Fig. 75). The visual aphasic can see perfectly anything put before him, butwritten symbols, figures, and other conventional signs have entirely lost SPEECH AND THE CORTEX—APHASIA. 181 their significance. That he sees them clearly is shown by the
Size: 1715px × 1457px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectmentalillness, booksubjectnervoussys
