| Neurons in the inferior colliculus of cats sensitive to sound-source elevation. | |
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MedLine Citation:
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PMID: 2076986 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The sensitivity to variations in sound-source elevation was studied in 48 units, previously examined as to their azimuthal sensitivity, of the inferior colliculi of cats. Of these units, 36 were directionally-sensitive (firing rate varied by more than 50% across the range of positions studied) to both azimuthal and elevational changes. Elevation sensitivity was common to noise stimuli (19/25 units) and pure tones in excess of 6 kHz (17/17 units). Not one of the 8 azimuth-sensitive units with CFs below 6 kHz was directionally-sensitive to the elevation of CF stimuli. The 4 units omnidirectional to azimuthal variation were similarly insensitive to elevation. The shapes of functions relating sound-source elevation to spike count (elevation functions) varied across an apparent continuum, with some very sharply-peaked functions being observed. Peak spike counts almost invariably occurred at stimulus elevations above the horizontal plane. Comparisons of the widths of elevation and azimuth functions at the same sound pressure level were made for 36 units. The relative sharpness of elevation and azimuthal tuning varied across the population. The common association of sensitivity to both azimuth and elevation suggests that elevation sensitivity may be mediated partly by binaural comparisons. |
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Authors:
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L Aitkin; R Martin |
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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: Hearing research Volume: 50 ISSN: 0378-5955 ISO Abbreviation: Hear. Res. Publication Date: 1990 Dec |
Date Detail:
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Created Date: 1991-04-23 Completed Date: 1991-04-23 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7900445 Medline TA: Hear Res Country: NETHERLANDS |
Other Details:
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Languages: eng Pagination: 97-105 Citation Subset: IM |
Affiliation:
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Department of Physiology, Monash University, Melbourne, Australia. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Stimulation
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methods Animals Cats / physiology* Inferior Colliculi / cytology, physiology* Neurons / physiology* Sound Localization / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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