Modality maps within primate somatosensory cortex
Identifieur interne : 000A81 ( Pmc/Curation ); précédent : 000A80; suivant : 000A82Modality maps within primate somatosensory cortex
Auteurs : Robert M. Friedman ; Li Min Chen ; Anna Wang RoeSource :
- Proceedings of the National Academy of Sciences of the United States of America [ 0027-8424 ] ; 2004.
Abstract
The sensations of pressure, flutter, and vibration are psychophysically distinct tactile modalities produced by frequency-specific vibrotactile stimulation of different mechanoreceptors in the skin. The information coded by the different low-threshold mechanoreceptors are carried by anatomically and electrophysiologically distinct pathways that remain separate at least up to and including the input stage of primary somatosensory cortex (SI) in primates, area 3b. Little is known about the functional organization of tactile representation beyond that stage. By using intrinsic optical imaging methods to record from area 1, the second processing stage of SI, we present evidence that pressure, flutter, and vibratory stimuli activate spatially distinct cortical domains in area 1, further strengthening the foundation for modality-specific processing streams in SI. These modality domains exhibit an organization that is unlike the discontinuous modality maps in visual area V2 but more like the continuous visual orientation maps in V1. The results demonstrate that psychophysically distinct sensory modalities can have fundamentally different modes of cortical representation.
Url:
DOI: 10.1073/pnas.0404884101
PubMed: 15308779
PubMed Central: 514661
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<author><name sortKey="Chen, Li Min" sort="Chen, Li Min" uniqKey="Chen L" first="Li Min" last="Chen">Li Min Chen</name>
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<front><div type="abstract" xml:lang="en"><p>The sensations of pressure, flutter, and vibration are psychophysically distinct tactile modalities produced by frequency-specific vibrotactile stimulation of different mechanoreceptors in the skin. The information coded by the different low-threshold mechanoreceptors are carried by anatomically and electrophysiologically distinct pathways that remain separate at least up to and including the input stage of primary somatosensory cortex (SI) in primates, area 3b. Little is known about the functional organization of tactile representation beyond that stage. By using intrinsic optical imaging methods to record from area 1, the second processing stage of SI, we present evidence that pressure, flutter, and vibratory stimuli activate spatially distinct cortical domains in area 1, further strengthening the foundation for modality-specific processing streams in SI. These modality domains exhibit an organization that is unlike the discontinuous modality maps in visual area V2 but more like the continuous visual orientation maps in V1. The results demonstrate that psychophysically distinct sensory modalities can have fundamentally different modes of cortical representation.</p>
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<pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Proc Natl Acad Sci U S A</journal-id>
<journal-id journal-id-type="publisher-id">pnas</journal-id>
<journal-title>Proceedings of the National Academy of Sciences of the United States of America</journal-title>
<issn pub-type="ppub">0027-8424</issn>
<issn pub-type="epub">1091-6490</issn>
<publisher><publisher-name>National Academy of Sciences</publisher-name>
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<article-id pub-id-type="pmc">514661</article-id>
<article-id pub-id-type="publisher-id">10112724</article-id>
<article-id pub-id-type="doi">10.1073/pnas.0404884101</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Biological Sciences</subject>
<subj-group><subject>Neuroscience</subject>
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</subj-group>
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<title-group><article-title>Modality maps within primate somatosensory cortex</article-title>
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<contrib-group><contrib contrib-type="author"><name><surname>Friedman</surname>
<given-names>Robert M.</given-names>
</name>
<xref ref-type="aff" rid="N0x983c440.0x9cc2708">*</xref>
<xref ref-type="corresp" rid="cor1">†</xref>
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<contrib contrib-type="author"><name><surname>Chen</surname>
<given-names>Li Min</given-names>
</name>
<xref ref-type="aff" rid="N0x983c440.0x9cc2708">‡</xref>
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<contrib contrib-type="author"><name><surname>Roe</surname>
<given-names>Anna Wang</given-names>
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<xref ref-type="aff" rid="N0x983c440.0x9cc2708">‡</xref>
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<aff id="N0x983c440.0x9cc2708">Departments of<label>‡</label>
Neurobiology and<label>*</label>
Anesthesiology, Yale University School of Medicine, New Haven, CT 06520-8051</aff>
<author-notes><fn id="cor1"><label>†</label>
<p> To whom correspondence should be sent at the present address: Department of Psychology, Vanderbilt University, 301 Wilson Hall, 111 21st Avenue South, Nashville, TN 37203. E-mail: <email>robert.friedman@vanderbilt.edu</email>
. </p>
</fn>
<fn><p>Communicated by Jon H. Kaas, Vanderbilt University, Nashville, TN, July 7, 2004</p>
</fn>
</author-notes>
<pub-date pub-type="ppub"><day>24</day>
<month>8</month>
<year>2004</year>
</pub-date>
<pub-date pub-type="epub"><day>12</day>
<month>8</month>
<year>2004</year>
</pub-date>
<volume>101</volume>
<issue>34</issue>
<fpage>12724</fpage>
<lpage>12729</lpage>
<history><date date-type="received"><day>1</day>
<month>4</month>
<year>2004</year>
</date>
</history>
<copyright-statement>Copyright © 2004, The National Academy of Sciences</copyright-statement>
<copyright-year>2004</copyright-year>
<license><p>Freely available online through the PNAS open access option.</p>
</license>
<abstract><p>The sensations of pressure, flutter, and vibration are psychophysically distinct tactile modalities produced by frequency-specific vibrotactile stimulation of different mechanoreceptors in the skin. The information coded by the different low-threshold mechanoreceptors are carried by anatomically and electrophysiologically distinct pathways that remain separate at least up to and including the input stage of primary somatosensory cortex (SI) in primates, area 3b. Little is known about the functional organization of tactile representation beyond that stage. By using intrinsic optical imaging methods to record from area 1, the second processing stage of SI, we present evidence that pressure, flutter, and vibratory stimuli activate spatially distinct cortical domains in area 1, further strengthening the foundation for modality-specific processing streams in SI. These modality domains exhibit an organization that is unlike the discontinuous modality maps in visual area V2 but more like the continuous visual orientation maps in V1. The results demonstrate that psychophysically distinct sensory modalities can have fundamentally different modes of cortical representation.</p>
</abstract>
</article-meta>
<notes><fn-group><fn><p>Abbreviations: SA, slowly adapting Merkel cell; RA, rapidly adapting Meissner corpuscle; PC, Pacinian corpuscle; SI, primary somatosensory cortex.</p>
</fn>
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