Linked Life Data

15813933

Source:http://linkedlifedata.com/resource/pubmed/id/15813933

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pubmed-article:15813933pubmed:dateCreated2005-4-7lld:pubmed
pubmed-article:15813933pubmed:abstractTextVentral cochlear nucleus stellate cells respond to characteristic frequency (CF) tones with sustained (C(S)), transient (C(T)) or onset chopping (O(C)) activity. The mechanisms underlying these different response patterns are not fully understood, and the present study used in vivo intracellular recordings (n = 42) in urethane-anaesthetized rats to examine the possible influence of inhibition on action potential regularity. Hyperpolarization following the offset of a CF tone burst was used as a measure of on-CF inhibition. A cluster analysis based on several membrane potential features, including on-CF inhibition, discriminated three groups in addition to the C(S) response type - two types of C(T) responses and the O(C) type. The different patterns of firing regularity exhibited by C(S/T) neurons reflected different thresholds or degrees of overlap between these cells' narrowly tuned excitatory and inhibitory inputs. C(T) cells with closely matched inhibitory and excitatory response areas showed substantial on-CF inhibition and the greatest decline in firing regularity during a CF tone, whereas those with a mismatch between their response areas showed lateral inhibition and a less marked decline in firing regularity. The presence of inhibition in C(S) neurons did not alter their firing regularity, possibly because of the lower threshold for excitation compared with inhibition. The latency, duration and frequency extent of sustained hyperpolarization in C(S/T) cells is inconsistent with the response properties of O(C) neurons, suggesting that another source(s) of inhibition influences firing regularity, and presumably response magnitude, in these neurons.lld:pubmed
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pubmed-article:15813933pubmed:authorpubmed-author:ClarkGraeme...lld:pubmed
pubmed-article:15813933pubmed:authorpubmed-author:NeedhamKarina...lld:pubmed
pubmed-article:15813933pubmed:authorpubmed-author:PaoliniAntoni...lld:pubmed
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pubmed-article:15813933pubmed:pagination1236-48lld:pubmed
pubmed-article:15813933pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:15813933pubmed:year2005lld:pubmed
pubmed-article:15813933pubmed:articleTitleBalanced inhibition and excitation underlies spike firing regularity in ventral cochlear nucleus chopper neurons.lld:pubmed
pubmed-article:15813933pubmed:affiliationSchool of Psychological Science, La Trobe University, Bundoora, Victoria 3086, Australia. a.paolini@latrobe.edu.aulld:pubmed
pubmed-article:15813933pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:15813933pubmed:publicationTypeComparative Studylld:pubmed
pubmed-article:15813933pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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