DISSOCIATION OF LETTER AND PICTURE NAMING RESULTING FROM CALLOSAL DISCONNECTION

Citation
K. Suzuki et al., DISSOCIATION OF LETTER AND PICTURE NAMING RESULTING FROM CALLOSAL DISCONNECTION, Neurology, 51(5), 1998, pp. 1390-1394
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Clinical Neurology
Journal title
ISSN journal
0028-3878
Volume
51
Issue
5
Year of publication
1998
Pages
1390 - 1394
Database
ISI
SICI code
0028-3878(1998)51:5<1390:DOLAPN>2.0.ZU;2-S
Abstract
Background: Detailed mapping of the corpus callosum for functional fra ctionation in humans remains incomplete. Objective: To examine separab le interhemispheric transfer of visual information by callosal fibers, especially in the splenium. Methods: We examined callosal disconnecti on signs in a 14-year-old boy with a lesion confined to the posterior part of the splenium and reviewed reported cases with callosal lesions . Results and Conclusion: The patient presented with left hemialexia a s the only manifestation of callosal disconnection syndrome, The only difficulty demonstrated was in reading aloud or copying letters, which were presented tachistoscopically to the left visual field, with his right hand. He could copy letters presented to his left visual field w ith his left hand, however. Therefore, left hemialexia was not due to hemiamblyopia or hemineglect. There was no anemia for pictures and col ors in the left visual field. MRI revealed that the lesion was limited to the ventroposterior end of the splenium, Review of 40 reported pat ients with callosal lesions suggests that the anterior to middle part of the splenium is involved in transferring picture information from t he language-nondominant hemisphere to the language-dominant hemisphere and that the ventroposterior part is involved in transferring letter information.