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Cerebral language lateralization: evidence from intracarotid amobarbital testing
D W Loring1, K J Meador, G P Lee
1Department of Neurology, Medical College of Georgia, Augusta 30912-3275.
Neuropsychologia
|January 1, 1990
Summary
Most epilepsy patients undergoing intracarotid amobarbital testing show left hemisphere language dominance. Bilateral language representation is common, while exclusive right hemisphere language is rare.
Area of Science:
- Neuroscience
- Neurology
- Cognitive Science
Background:
- Cerebral language lateralization is crucial for understanding brain function.
- Intracarotid amobarbital testing (IAT) is a standard method for assessing language dominance.
- Epilepsy surgery planning requires accurate lateralization to prevent deficits.
Purpose of the Study:
- To investigate cerebral language lateralization in epilepsy patients using IAT.
- To determine the incidence of exclusive and bilateral language representation.
- To examine the influence of evaluation methods on reported lateralization patterns.
Main Methods:
- 103 epilepsy patients undergoing IAT were analyzed.
- Inclusion criteria: adequate bilateral IAT and no non-temporal lobe lesions.
- Language representation was assessed for presence/absence and relative hemispheric dominance.
Main Results:
- 79 patients (76.7%) had exclusive left hemisphere language representation.
- 2 patients (1.9%) showed exclusive right hemisphere language representation.
- 22 patients (21.4%) had bilateral language representation, with asymmetry in 17 (13 L>R, 4 R>L).
Conclusions:
- Exclusive right hemisphere language representation is rare.
- Bilateral language representation is common, especially when left hemisphere dominance is absent.
- Previous reports of high exclusive right hemisphere language incidence may stem from methodological artifacts.