Document Detail

Abnormal auditory neural networks in patients with right hemispheric infarction, chronic dizziness, and moyamoya disease: a magnetoencephalogram study.
MedLine Citation:
PMID:  12413656     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to determine whether the auditory cortex is sensitive to cortical insults and to determine the specificity of the insults in three clinical situations with different cortical involvement. Auditory-evoked magnetic fields of ten normal subjects, 8 patients with right hemispheric infarction, 11 with chronic dizziness, and 2 with moyamoya disease were measured. To analyze the abnormality of auditory neural networks, the magnitude ratio and the angle difference (Deltatheta) between response vectors, which were determined from maximum current arrows corresponding to the N100m peak for contralateral and ipsilateral stimuli were used. A normal range of the parameters was defined so that abnormal values could be determined. Of the three parameters, Deltatheta was the most sensitive: 4 patients with right hemispheric infarction, 4 with chronic dizziness, and 1 with moyamoya disease had abnormal Deltatheta. The electrical activity in the patients with such abnormal Deltathetas had a circular current pattern. These findings suggest that right infarction lesions sometime affect the left auditory neural network, dizziness is caused by abnormal neural networks between the vestibular cortical area and the auditory cortex or by an imbalance between left and right auditory-cortex activities, and moyamoya-disease patients have almost normal auditory-electrical activity.
Akihiko Kandori; Hiroshi Oe; Kotaro Miyashita; Hiroshi Date; Naoaki Yamada; Hiroaki Naritomi; Yoshihide Chiba; Tsuyoshi Miyashita; Keiji Tsukada
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neuroscience research     Volume:  44     ISSN:  0168-0102     ISO Abbreviation:  Neurosci. Res.     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-11-04     Completed Date:  2002-12-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8500749     Medline TA:  Neurosci Res     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  273-83     Citation Subset:  IM    
Central Research Laboratory, Hitachi, Ltd, Medical System Research Department, 1-280 Higashi-Koigakubo, Kokubunji-shi, 185-8601, Tokyo, Japan.
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MeSH Terms
Acoustic Stimulation
Auditory Perception / physiology*
Cerebral Infarction / physiopathology*
Chronic Disease
Dizziness / physiopathology*
Functional Laterality / physiology
Middle Aged
Moyamoya Disease / physiopathology*
Nerve Net / physiopathology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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