Sensory and motor interhemispheric integration after section of different portions of the anterior corpus callosum in nonepileptic patients.

Abstract:

OBJECTIVE:We evaluated somatosensory and motor interhemispheric integration in four patients who underwent transection of different portions of the anterior corpus callosum (CC) for removal of an intraventricular cyst. The study goal was to relate their performances to the topographical organization of the CC. METHODS:Experimental tasks included bimanual coordination, tactile cross-localization, and intermanual and interfield comparisons of somesthetic information. Response accuracy and response times were measured. In addition, interhemispheric transmission times were obtained in the somesthetic modality. RESULTS:Section of the middle portion of the genu caused a deficit in motor coordination, which was absent in patients with more posteriorly located lesions, whereas section of more rostral portions of the genu seemed to interfere with motor planning. The most posterior section in our sample, including the anterior portion of the body of the corpus, abolished interhemispheric transfer of simple somesthetic information (perception of touch) but not tactile discrimination (intermanual comparisons of shapes). We speculate that more complex somesthetic information is transferred through the caudal region of the body of the CC, which was spared in all patients. Thus, it seems that section of different portions of the anterior CC (genu and anterior body) produces specific deficits in interhemispheric integration in the motor and somesthetic modalities. These deficits are consistent with the anteroposterior topography of anterior callosal fibers. CONCLUSION:The specific disconnections deficits observed in this study may provide the surgeon with information regarding the consequences of anterior callosotomy and allow for remedial measures to be implemented if required.

journal_name

Neurosurgery

journal_title

Neurosurgery

authors

Caillé S,Sauerwein HC,Schiavetto A,Villemure JG,Lassonde M

doi

10.1227/01.neu.0000163089.31657.08

keywords:

subject

Has Abstract

pub_date

2005-07-01 00:00:00

pages

50-9; discussion 50-9

issue

1

eissn

0148-396X

issn

1524-4040

journal_volume

57

pub_type

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