Evoked potential measures of auditory cortical function and auditory comprehension in aphasia.

Abstract:

:This study investigated the relation between severity of auditory comprehension impairment in aphasia and the functional integrity of the posterior superior temporal region as evaluated by middle- and long-latency auditory evoked potentials and dipole source analysis. AEPs were studied in 20 stroke patients and in age-matched controls. AEPs and language data were collected 1 year or more post onset, and were compared to performance early after onset. Patients were differentiated in a group with severe and a group with moderate to recovered auditory comprehension impairment. Significant asymmetries of auditory evoked dipole source potentials were more frequent in the severely impaired group. However, a severe auditory comprehension deficit was not incompatible with normal AEPs. The results confirm the importance of the posterior superior temporal region for auditory language comprehension, but the correlation between AEP asymmetry and auditory comprehension seems due to the close spatial relation of AEP generating substrate and posterior language area rather than to partial overlap. Dipole source analysis of AEPs proved to be a valuable method for the assessment of interhemispheric asymmetries, enhancing the sensitivity of AEPs to unilateral damage of auditory cortex.

journal_name

J Neurol Sci

authors

Praamstra P,Stegeman DF,Kooijman S,Moleman J

doi

10.1016/0022-510x(93)90064-6

subject

Has Abstract

pub_date

1993-03-01 00:00:00

pages

32-46

issue

1

eissn

0022-510X

issn

1878-5883

pii

0022-510X(93)90064-6

journal_volume

115

pub_type

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