Document Detail

Optical and FDG mapping of frequency-specific activity in auditory cortex.
MedLine Citation:
PMID:  8981439     Owner:  NLM     Status:  MEDLINE    
With optical recording of intrinsic signals (ORIS) and tone stimulation, we analysed frequency- and intensity-dependent spatio-temporal activity in primary auditory cortex AE of awake Mongolian gerbils. We found a two-dimensional and assymetric propagation of ORIS activity (1) from ventral to dorsal along isofrequency contours at all frequencies and (2) from the low-frequency end across the complete tonotopic gradient at low frequencies. High-frequency representations remained tonotopic. Tonotopic asymmetries were independent of stimulus intensity. By contrast, in fluoro-2-deoxyglucose images from the same animals metabolic activity was tonotopically confined at high and low frequencies. The assymetric tonotopic propagation of ORIS activity suggests subthreshold directional interaction mechanisms in the cortical network which may serve to relate low- to high-frequency components of complex sounds.
A Hess; H Scheich
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neuroreport     Volume:  7     ISSN:  0959-4965     ISO Abbreviation:  Neuroreport     Publication Date:  1996 Nov 
Date Detail:
Created Date:  1997-04-01     Completed Date:  1997-04-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9100935     Medline TA:  Neuroreport     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  2643-7     Citation Subset:  IM    
Federal Institute for Neurobiology (INF), Brenneckstrasse, Magdeburg, Germany.
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MeSH Terms
Acoustic Stimulation
Auditory Cortex / physiology*
Brain Mapping
Deoxyglucose / pharmacology*
Reg. No./Substance:

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

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