Fine Functional Organization of Auditory Cortex Revealed by Fourier Optical Imaging
We provide an overall view of the functional tonotopic organization of the auditory cortex in the rat. We apply a recently developed technique for acquiring intrinsic signal optical maps, Fourier imaging, in the rat auditory cortex. These highly detailed maps, derived in a several-minute-long record...
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| Published in | Proceedings of the National Academy of Sciences - PNAS Vol. 102; no. 37; pp. 13325 - 13330 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
National Academy of Sciences
13.09.2005
National Acad Sciences |
| Subjects | |
| Online Access | Get full text |
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| Abstract | We provide an overall view of the functional tonotopic organization of the auditory cortex in the rat. We apply a recently developed technique for acquiring intrinsic signal optical maps, Fourier imaging, in the rat auditory cortex. These highly detailed maps, derived in a several-minute-long recording procedure, delineate multiple auditory cortical areas and demonstrate their shapes, sizes, and tonotopic order. Beyond the primary auditory cortex, there are at least three distinct areas with fine-scale tonotopic organization, as well as at least one additional high-frequency field. The arrangement of all of these cortical areas is consistent across subjects. The accuracy of these optical maps was confirmed by microelectrode mapping in the same subjects. This imaging method allows fast mapping of the auditory cortex at high spatial resolution comparable to that provided by conventional microelectrode technique. Although spiking activity is largely responsible for the evoked intrinsic signals, certain features of the optical signal cannot be explained by spiking activity only, and should probably be attributed to other mechanisms inducing metabolic activity, such as subthreshold membrane phenomena. |
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| AbstractList | We provide an overall view of the functional tonotopic organization of the auditory cortex in the rat. We apply a recently developed technique for acquiring intrinsic signal optical maps, Fourier imaging, in the rat auditory cortex. These highly detailed maps, derived in a several-minute-long recording procedure, delineate multiple auditory cortical areas and demonstrate their shapes, sizes, and tonotopic order. Beyond the primary auditory cortex, there are at least three distinct areas with fine-scale tonotopic organization, as well as at least one additional high-frequency field. The arrangement of all of these cortical areas is consistent across subjects. The accuracy of these optical maps was confirmed by microelectrode mapping in the same subjects. This imaging method allows fast mapping of the auditory cortex at high spatial resolution comparable to that provided by conventional microelectrode technique. Although spiking activity is largely responsible for the evoked intrinsic signals, certain features of the optical signal cannot be explained by spiking activity only, and should probably be attributed to other mechanisms inducing metabolic activity, such as subthreshold membrane phenomena. We provide an overall view of the functional tonotopic organization of the auditory cortex in the rat. We apply a recently developed technique for acquiring intrinsic signal optical maps, Fourier imaging, in the rat auditory cortex. These highly detailed maps, derived in a several-minute-long recording procedure, delineate multiple auditory cortical areas and demonstrate their shapes, sizes, and tonotopic order. Beyond the primary auditory cortex, there are at least three distinct areas with fine-scale tonotopic organization, as well as at least one additional high-frequency field. The arrangement of all of these cortical areas is consistent across subjects. The accuracy of these optical maps was confirmed by microelectrode mapping in the same subjects. This imaging method allows fast mapping of the auditory cortex at high spatial resolution comparable to that provided by conventional microelectrode technique. Although spiking activity is largely responsible for the evoked intrinsic signals, certain features of the optical signal cannot be explained by spiking activity only, and should probably be attributed to other mechanisms inducing metabolic activity, such as subthreshold membrane phenomena. [PUBLICATION ABSTRACT] We provide an overall view of the functional tonotopic organization of the auditory cortex in the rat. We apply a recently developed technique for acquiring intrinsic signal optical maps, Fourier imaging, in the rat auditory cortex. These highly detailed maps, derived in a several-minute-long recording procedure, delineate multiple auditory cortical areas and demonstrate their shapes, sizes, and tonotopic order. Beyond the primary auditory cortex, there are at least three distinct areas with fine-scale tonotopic organization, as well as at least one additional high-frequency field. The arrangement of all of these cortical areas is consistent across subjects. The accuracy of these optical maps was confirmed by microelectrode mapping in the same subjects. This imaging method allows fast mapping of the auditory cortex at high spatial resolution comparable to that provided by conventional microelectrode technique. Although spiking activity is largely responsible for the evoked intrinsic signals, certain features of the optical signal cannot be explained by spiking activity only, and should probably be attributed to other mechanisms inducing metabolic activity, such as subthreshold membrane phenomena. optical imaging of intrinsic signals rat tonotopy cortical maps We provide an overall view of the functional tonotopic organization of the auditory cortex in the rat. We apply a recently developed technique for acquiring intrinsic signal optical maps, Fourier imaging, in the rat auditory cortex. These highly detailed maps, derived in a several-minute-long recording procedure, delineate multiple auditory cortical areas and demonstrate their shapes, sizes, and tonotopic order. Beyond the primary auditory cortex, there are at least three distinct areas with fine-scale tonotopic organization, as well as at least one additional high-frequency field. The arrangement of all of these cortical areas is consistent across subjects. The accuracy of these optical maps was confirmed by microelectrode mapping in the same subjects. This imaging method allows fast mapping of the auditory cortex at high spatial resolution comparable to that provided by conventional microelectrode technique. Although spiking activity is largely responsible for the evoked intrinsic signals, certain features of the optical signal cannot be explained by spiking activity only, and should probably be attributed to other mechanisms inducing metabolic activity, such as subthreshold membrane phenomena.We provide an overall view of the functional tonotopic organization of the auditory cortex in the rat. We apply a recently developed technique for acquiring intrinsic signal optical maps, Fourier imaging, in the rat auditory cortex. These highly detailed maps, derived in a several-minute-long recording procedure, delineate multiple auditory cortical areas and demonstrate their shapes, sizes, and tonotopic order. Beyond the primary auditory cortex, there are at least three distinct areas with fine-scale tonotopic organization, as well as at least one additional high-frequency field. The arrangement of all of these cortical areas is consistent across subjects. The accuracy of these optical maps was confirmed by microelectrode mapping in the same subjects. This imaging method allows fast mapping of the auditory cortex at high spatial resolution comparable to that provided by conventional microelectrode technique. Although spiking activity is largely responsible for the evoked intrinsic signals, certain features of the optical signal cannot be explained by spiking activity only, and should probably be attributed to other mechanisms inducing metabolic activity, such as subthreshold membrane phenomena. |
| Author | Polley, Daniel B. Merzenich, Michael M. Schreiner, Christoph E. Stryker, Michael P. Kalatsky, Valery A. |
| AuthorAffiliation | W. M. Keck Foundation Center for Integrative Neuroscience, Department of Physiology, University of California, San Francisco, CA 94143 |
| AuthorAffiliation_xml | – name: W. M. Keck Foundation Center for Integrative Neuroscience, Department of Physiology, University of California, San Francisco, CA 94143 |
| Author_xml | – sequence: 1 givenname: Valery A. surname: Kalatsky fullname: Kalatsky, Valery A. – sequence: 2 givenname: Daniel B. surname: Polley fullname: Polley, Daniel B. – sequence: 3 givenname: Michael M. surname: Merzenich fullname: Merzenich, Michael M. – sequence: 4 givenname: Christoph E. surname: Schreiner fullname: Schreiner, Christoph E. – sequence: 5 givenname: Michael P. surname: Stryker fullname: Stryker, Michael P. |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/16141342$$D View this record in MEDLINE/PubMed |
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| Notes | SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 Abbreviations: SPL, sound pressure level; CF, characteristic frequency; RF, receptive field; A1, primary auditory cortex; AAF, anterior auditory field; VAF, ventral auditory field; VAAF, ventral anterior auditory field; BF, best frequency. To whom correspondence may be addressed. E-mail: vkalatsky@uh.edu or merz@phy.ucsf.edu. Present address: Department of Electrical and Computer Engineering, University of Houston, 4800 Calhoun Road, Building 1, Room N308, Houston, TX 77204-4005. Author contributions: V.A.K., M.M.M., C.E.S., and M.P.S. designed research; V.A.K. and D.B.P. performed research; V.A.K. analyzed data; and V.A.K., D.B.P., M.M.M., C.E.S., and M.P.S. wrote the paper. Contributed by Michael M. Merzenich, July 11, 2005 A preliminary report of this work was presented in Kalatsky, V. A. & Stryker M. P. (2002) Soc. Neurosci. Abstr. 354.15 (abstr.). |
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| SubjectTerms | Animals Auditory cortex Auditory Cortex - anatomy & histology Biological Sciences Brain Brain Mapping - methods Diagnostic Imaging - methods Diagnostic Imaging - standards Document imaging Ears & hearing Electrophysiology Female Fourier Analysis Hemodynamics Imaging Male Medical imaging Methods Neurology Neurons Neuroscience Octaves Rats Rats, Sprague-Dawley Rodents Ultrasonography |
| Title | Fine Functional Organization of Auditory Cortex Revealed by Fourier Optical Imaging |
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