A text-book of physiology for medical students and physicians . cortical centers for hearing and seeing aresituated in distinct parts of the brain, we should expect that themechanism for the association, in one case of visual memories ofverbal symbols with certain concepts, and in the other case, ofauditory memories, should also be located in separate to understand spoken language, or word-deafness, is, infact, usually attributed to a lesion involving the superior or middletemporal convolution contiguous to the cortical sense of hearing(H, Fig. 97), while loss of power to und
A text-book of physiology for medical students and physicians . cortical centers for hearing and seeing aresituated in distinct parts of the brain, we should expect that themechanism for the association, in one case of visual memories ofverbal symbols with certain concepts, and in the other case, ofauditory memories, should also be located in separate to understand spoken language, or word-deafness, is, infact, usually attributed to a lesion involving the superior or middletemporal convolution contiguous to the cortical sense of hearing(H, Fig. 97), while loss of power to understand written or printedlanguage, word-blindness (alexia), is traced to lesions involving the * For these opposing views and the work of Marie see Moutier, LAphasiade Broca, Paris, 1908. fSee Mills, Journal of the Amer. Med. Assoc, 1904, xliii. | Consult Starr, Aphasia, Transactions of the Congress of AmericanPhysicians and Surgeons, vol. 1, p. 329, 1888; also Monakow, Gehirn-pathologie, 1906; Collier, Brain, 1908. 220 PHYSIOLOGY OF CENTRAL NERVOUS inferior parietal convolution, the gyrus angularis, contiguous tothe occipital visual center (V, Fig. 97). These two conditionsmay occur together, but cases are recorded in which they existedindependently. It may be imagined that the individual sufferingfrom word-blindness alone is essentially in the condition of onewho attempts to read a foreign language. The power of visionexists, but the verbal symbols have no associations, therefore nomeaning. So one who is word-deaf alone may be compared to thenormal individual who is spoken to in a foreign tongue. The words are heard, but theyhave no associationswith past aphasia maybe complete or incom-plete. In the com-plete form there isword-deafness as wellas word-blindness,andthere may be difficul-ties as well in the pow-er of articulate the incomplete typethese symptoms areexhibited in milderand varying may imagine thatour ability to recog-
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