Mapping
Language Areas in the Brain by Lesion Analysis
Nina
F. Dronkers
Director, Center for Aphasia and Related Disorders, VA Northern California
Health Care System and
Departments of Neurology and Linguistics, University of California,
Davis, USA
Abstract: Classic descriptions of the brain areas involved in language
have focussed on those in the left cerebral hemisphere known as Broca's
area, Wernicke's area and the connecting bundle of fibers between them,
the arcuate fasciculus. These descriptions have served a useful clinical
purpose over the last century, but recent advances in the study of language
and in neuroimaging have found additional areas that contribute to language
processing. This presentation discusses findings from our work with
aphasic patients examining the relationship between specific speech
and language disorders and the brain lesions underlying these deficits.
Techniques used to define these relationships using structural neuroimaging
will be discussed. It will be shown that numerous brain areas help to
subserve language, that traditional language areas may serve somewhat
different functions than originally described, and that the identification
of very specific behavioral deficits and their neuroanatomic correlates
can lead to effective mapping of language functions in the brain.
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