Connections of cat auditory cortex: I. Thalamocortical system.

Connections of cat auditory cortex: I. Thalamocortical system. Research Abstract Details 

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Connections of cat auditory cortex: I. Thalamocortical system. Abstract Text:

Charles C Lee,Jeffery A Winer,

Despite the functional importance of the medial geniculate body (MGB) in normal hearing, many aspects of its projections to auditory cortex are unknown. We analyzed the MGB projections to 13 auditory areas in the cat using two retrograde tracers to investigate thalamocortical nuclear origins, topography, convergence, and divergence. MGB divisions and auditory cortex areas were defined independently of the connectional results using architectonic, histochemical, and immunocytochemical criteria. Each auditory cortex area received a unique pattern of input from several MGB nuclei, and these patterns of input identify four groups of cortical areas distinguished by their putative functional affiliations: tonotopic, nontonotopic, multisensory, and limbic. Each family of areas received projections from a functionally related set of MGB nuclei; some nuclei project to only a few areas (e.g., the MGB ventral division to tonotopic areas), and others project to all areas (e.g., the medial division input to every auditory cortical area and to other regions). Projections to tonotopic areas had fewer nuclear origins than those to multisensory or limbic-affiliated fields. All projections were organized topographically, even those from nontonotopic nuclei. The few divergent neurons (mean: 2%) are consistent with a model of multiple segregated streams ascending to auditory cortex. The expanded cortical representation of MGB auditory, multisensory, and limbic affiliated streams appears to be a primary facet of forebrain auditory function. The emergence of several auditory cortex representations of characteristic frequency may be a functional multiplication of the more limited maps in the MGB. This expansion suggests emergent cortical roles consistent with the divergence of thalamocortical connections.

Connections of cat auditory cortex: I. Thalamocortical system. Publishing Authors By Initials

CC Lee,JA Winer,

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Connections of cat auditory cortex: I. Thalamocortical system. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: The Journal of comparative neurology

VOLUME: 507

Page Numbers: 1879-900

Journal Abbreviation: J. Comp. Neurol.

ISSN: 1096-9861

DAY: 20

MONTH: Apr

YEAR: 2008

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LANGUAGE: eng

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AFFILIATION: Division of Neurobiology, Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, California 94720-3200, USA. clee@bsd.uchicago.edu

Country: United States

AGENCY: United States NIDCD

GRANT: R01 DC2319-29

ACRONYM: DC

MEDLINETA: J Comp Neurol

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