| Dynamic movement of N100m dipoles in evoked magnetic field reflects sequential activation of isofrequency bands in human auditory cortex. | |
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MedLine Citation:
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PMID: 12948797 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: To investigate spatiotemporal features of the isofrequency bands for 400 and 4000 Hz tones in human auditory cortex and on the hemispheric differences in the arrangement of isofrequency bands. METHODS: We recorded auditory evoked magnetic fields (AEFs) to 400 or 4000 Hz tone pips presented at right or left ear from 31 normal subjects. The dipole location for the N100m sources was successively calculated from the AEFs obtained from the hemisphere contralateral to the stimulated ear. RESULTS: In the right hemisphere, the current sources for 400 and 4000 Hz moved toward the anterolateral direction before the N100m peak, showing parallel arrangement of the isofrequency bands (4000 Hz in medial location). In the left hemisphere, the movement direction of 400 Hz dipoles was anterolateral, while that of 4000 Hz dipoles was lateral. CONCLUSIONS: This difference in the organization of isofrequency bands between right and left auditory cortices reflects distinct functional roles in auditory information processing such as pitch vs. language discrimination. SIGNIFICANCE: This work is the first to disclose isofrequency bands in human auditory cortex based on the analysis of magnetoencephalography. |
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Authors:
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Isamu Ozaki; Yasumi Suzuki; Chun Yu Jin; Masayuki Baba; Muneo Matsunaga; Isao Hashimoto |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology Volume: 114 ISSN: 1388-2457 ISO Abbreviation: Clin Neurophysiol Publication Date: 2003 Sep |
Date Detail:
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Created Date: 2003-09-01 Completed Date: 2003-11-04 Revised Date: 2008-09-10 |
Medline Journal Info:
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Nlm Unique ID: 100883319 Medline TA: Clin Neurophysiol Country: Netherlands |
Other Details:
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Languages: eng Pagination: 1681-8 Citation Subset: IM |
Affiliation:
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Department of Physical Therapy, Faculty of Health Science, Aomori University of Health and Welfare, 58-1 Mase, Hamadate, Aomori 030-8505, Japan. isamu@auhw.ac.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Stimulation Adolescent Adult Auditory Cortex / physiology* Brain Mapping Dose-Response Relationship, Radiation Electromagnetic Fields* Evoked Potentials, Auditory / physiology* Female Functional Laterality / physiology* Humans Magnetic Resonance Imaging Male Movement / physiology* Orientation Reaction Time |
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