Document Detail

Lateralisation of sound in temporal-lobe epilepsy: Comparison between pre- and postoperative performances and ERPs.
MedLine Citation:
PMID:  22883476     Owner:  NLM     Status:  Publisher    
OBJECTIVE: Our aim was to investigate if spatial hearing is impaired in mesial temporal lobe epilepsy and temporal lobectomy has an effect on this function. METHODS: Thirteen patients with mesial temporal lobe epilepsy (TLE) due to sclerosis in their left (n=6) or right (n=7) hippocampus were studied. Their sound lateralisation performance indexed by d' was tested against that of a group of normal subjects (n=13). Patients' ERPs to lateralisation shifts induced by interaural disparities of intensity (IID) and time (ITD) were also recorded. Eight of the patients were re-tested after they underwent anterior temporal lobectomy, which involved the resection/removal of medial structures including amygdala, hippocampus and parahippocampal gyrus. RESULTS: The sound-lateralisation performance of the TLE patients was significantly lower than normal subjects, and this disadvantage of the patients was specific to IID-based lateralisation. Amplitudes of their N1 and P2 responses to laterally shifting sounds were much lower than those reported previously for normal subjects. Lobectomy did not have a statistically significant effect on patients' sound-lateralisation performance nor on the amplitude of their auditory directional ERPs. CONCLUSIONS: The results show that especially the IID-based sound-lateralisation performance is impaired in TLE patients and that lobectomy should not cause any further deterioration. SIGNIFICANCE: This study suggests that a test for assessing the ability of sound lateralisation based on each of the IID and ITD cues should be included in the evaluation of TLE patients.
F Irsel Tezer; Barkin Ilhan; Nurhan Erbil; Serap Saygi; Nejat Akalan; Pekcan Ungan
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-7
Journal Detail:
Title:  Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology     Volume:  -     ISSN:  1872-8952     ISO Abbreviation:  Clin Neurophysiol     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100883319     Medline TA:  Clin Neurophysiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.
Hacettepe University, Faculty of Medicine, Department of Neurology, Ankara, Turkey.
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