Neuropsychological Studies on Partial Split-Brain Patients in Japan

  • Makoto Iwata
  • Yasuo Toyokura

Abstract

Although neurological syndromes due to callosal disconnection such as buccofacial apraxia or pure alexia are fairly common, patients with primary lesions of the corpus callosum are not so frequently encountered in routine neurological examinations. However, careful attention to possible callosal damage in various neurological disorders can enable the practitioner to see a number of patients with primary callosal pathology, and detailed neuropsychological and neurological studies upon these patients can provide much valuable information with regard to the functional topography of the corpus callosum that is not readily available in studies of total callosal section for epilepsy (Iwata, 1979, 1980). In the present chapter we describe our studies upon partial lesions of the corpus callosum from various causes and discuss the functional topography of callosal transfer between the two cerebral hemispheres.

Keywords

Depression Neurol Kato Teratoma Fist 

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References

  1. Abe, T., Kato, Y., Sekinao, H., Nakamura, N., and Konno, Y., 1976, A case of ice-pick brain injury without neurological sequels (abstract), Clin. Neurol. (Tokyo) 16: 278.Google Scholar
  2. Brion, S., and Jedynak, C. P., 1975, Les troubles du transfert interhémisphérique, Masson, Paris.Google Scholar
  3. Damasio, A. R., Chui, H. C., Corbett, J., and Kassel, N., 1980, Posterior callosal section in a non-epileptic patient, J. Neurol. Neurosurg. Psychiatry 43: 351–356.PubMedCrossRefGoogle Scholar
  4. Gazzaniga, M. S., and Freedman, H., 1973, Observations on visual processes after posterior callosal section, Neurology 23: 1126–1130.PubMedGoogle Scholar
  5. Geschwind, N., 1965, Disconnexion syndromes in animals and man, Brain 88: 237–294, 585–644.Google Scholar
  6. Geschwind, N., and Kaplan, E., 1962, A human cerebral deconnection syndrome. A preliminary report, Neurology 12: 675–685.PubMedGoogle Scholar
  7. Iwata, M., 1974, Interhemispheric association disturbances due to lesions of the corpus callosum (callosal disconnexion syndrome), Brain Nerve 26: 161–170, 291–303.Google Scholar
  8. Iwata, M., 1979, Callosal disconnexion syndrome in neuropsychological examinations, Brain Nerve 31: 881–889.PubMedGoogle Scholar
  9. Iwata, M., 1980, Functional localization within the corpus callosum in man, Adv. Neurol. Sci. 24: 1089–1098.Google Scholar
  10. Iwata, M., 1981, Callosal apraxia. Clin. Psychiatry 23: 991–999.Google Scholar
  11. Iwata, M., Sugishita, M., and Toyokura, Y., 1973, Visual-speech disconnexion syndrome of the right visual cortex after the transection of the splenium of the corpus callosum, Clin. Neurol. (Tokyo) 13: 308–316.Google Scholar
  12. Iwata, M., Sugishita, M., Toyokura, Y., Yamada, R., and Yoshioka, M., 1974, Etude sur le syndrome de disconnexion visuo-linguale aprés la transection due splenium du corps calleux, J. Neurol. Sci. 23: 421–432.PubMedCrossRefGoogle Scholar
  13. Iwata, M., Sughishita, M., Kawai, M., Yamashita, N., and Toyokura, Y., 1979, Agraphia and kinesthetic alexia. Disturbances of visual language function due to the left angular gyrus lesion, Clin. Neurol. (Tokyo) 19: 462–468.Google Scholar
  14. Iwata, M., Sugishita, M., Yoshida, S., and Toyokura, Y., 1980, Left unilateral apraxia due to the lesion in the posterior half of the corpus callosum, Clin. Neurol. (Tokyo) 20: 721–727.CrossRefGoogle Scholar
  15. Jeeves, A. M., Simpson, A. D., and Geffen, G., 1979, Functional consequences of transcallosal removal of intraventricular tumor, J. Neurol. Neurosurg. Psychiatry 42: 134–142.PubMedCrossRefGoogle Scholar
  16. Sugishita, M., Iwata, M., Toyokura, Y., Yoshioka, M., and Yamada, R., 1978, Reading of ideograms and phonograms in Japanese patients after partial commissurotomy, Neuropsychologia 16: 417–426.PubMedCrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • Makoto Iwata
    • 1
  • Yasuo Toyokura
    • 1
  1. 1.Department of Neurology, Institute of Brain Research, Faculty of MedicineUniversity of TokyoTokyoJapan

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