Representation of tactile curvature in macaque somatosensory area 2
Identifieur interne : 002608 ( Ncbi/Merge ); précédent : 002607; suivant : 002609Representation of tactile curvature in macaque somatosensory area 2
Auteurs : Jeffrey M. Yau ; Charles E. Connor ; Steven S. HsiaoSource :
- Journal of Neurophysiology [ 0022-3077 ] ; 2013.
Abstract
Tactile shape information is elaborated in a cortical hierarchy spanning primary (SI) and secondary somatosensory cortex (SII). Indeed, SI neurons in areas 3b and 1 encode simple contour features such as small oriented bars and edges, whereas higher order SII neurons represent large curved contour features such as angles and arcs. However, neural coding of these contour features has not been systematically characterized in area 2, the most caudal SI subdivision in the postcentral gyrus. In the present study, we analyzed area 2 neural responses to embossed oriented bars and curved contour fragments to establish whether curvature representations are generated in the postcentral gyrus. We found that many area 2 neurons (26 of 112) exhibit clear curvature tuning, preferring contours pointing in a particular direction. Fewer area 2 neurons (15 of 112) show preferences for oriented bars. Because area 2 response patterns closely resembled SII patterns, we also compared area 2 and SII response time courses to characterize the temporal dynamics of curvature synthesis in the somatosensory system. We found that curvature representations develop and peak concurrently in area 2 and SII. These results reveal that transitions from orientation tuning to curvature selectivity in the somatosensory cortical hierarchy occur within SI rather than between SI and SII.
Url:
DOI: 10.1152/jn.00804.2012
PubMed: 23536717
PubMed Central: 3680817
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<front><div type="abstract" xml:lang="en"><p>Tactile shape information is elaborated in a cortical hierarchy spanning primary (SI) and secondary somatosensory cortex (SII). Indeed, SI neurons in areas 3b and 1 encode simple contour features such as small oriented bars and edges, whereas higher order SII neurons represent large curved contour features such as angles and arcs. However, neural coding of these contour features has not been systematically characterized in area 2, the most caudal SI subdivision in the postcentral gyrus. In the present study, we analyzed area 2 neural responses to embossed oriented bars and curved contour fragments to establish whether curvature representations are generated in the postcentral gyrus. We found that many area 2 neurons (26 of 112) exhibit clear curvature tuning, preferring contours pointing in a particular direction. Fewer area 2 neurons (15 of 112) show preferences for oriented bars. Because area 2 response patterns closely resembled SII patterns, we also compared area 2 and SII response time courses to characterize the temporal dynamics of curvature synthesis in the somatosensory system. We found that curvature representations develop and peak concurrently in area 2 and SII. These results reveal that transitions from orientation tuning to curvature selectivity in the somatosensory cortical hierarchy occur within SI rather than between SI and SII.</p>
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<article-categories><subj-group subj-group-type="heading"><subject>Articles</subject>
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<title-group><article-title>Representation of tactile curvature in macaque somatosensory area 2</article-title>
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<contrib-group><contrib contrib-type="author" corresp="yes"><name><surname>Yau</surname>
<given-names>Jeffrey M.</given-names>
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<contrib contrib-type="author"><name><surname>Connor</surname>
<given-names>Charles E.</given-names>
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<contrib contrib-type="author"><name><surname>Hsiao</surname>
<given-names>Steven S.</given-names>
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<aff>Zanvyl Krieger Mind/Brain Institute and Solomon H. Snyder Department of Neuroscience, Johns Hopkins University, Baltimore, Maryland</aff>
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<author-notes><corresp id="cor1">Address for reprint requests and other correspondence: J. M. Yau, <addr-line>Dept. of Neurology, Division of Cognitive Neuroscience, Johns Hopkins Univ., 1620 McElderry St., Reed Hall 2E, Rm. 2218A, Baltimore, MD 21205</addr-line>
(e-mail: <email>yau@jhu.edu</email>
).</corresp>
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<pub-date pub-type="epub"><day>27</day>
<month>3</month>
<year>2013</year>
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<pub-date pub-type="ppub"><day>15</day>
<month>6</month>
<year>2013</year>
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<pub-date pub-type="pmc-release"><day>15</day>
<month>6</month>
<year>2014</year>
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<pmc-comment> PMC Release delay is 12 months and 0 days and was based on the
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<volume>109</volume>
<issue>12</issue>
<fpage>2999</fpage>
<lpage>3012</lpage>
<history><date date-type="received"><day>10</day>
<month>9</month>
<year>2012</year>
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<date date-type="accepted"><day>22</day>
<month>3</month>
<year>2013</year>
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<permissions><copyright-statement>Copyright © 2013 the American Physiological Society</copyright-statement>
<copyright-year>2013</copyright-year>
<copyright-holder>American Physiological Society</copyright-holder>
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<abstract><p>Tactile shape information is elaborated in a cortical hierarchy spanning primary (SI) and secondary somatosensory cortex (SII). Indeed, SI neurons in areas 3b and 1 encode simple contour features such as small oriented bars and edges, whereas higher order SII neurons represent large curved contour features such as angles and arcs. However, neural coding of these contour features has not been systematically characterized in area 2, the most caudal SI subdivision in the postcentral gyrus. In the present study, we analyzed area 2 neural responses to embossed oriented bars and curved contour fragments to establish whether curvature representations are generated in the postcentral gyrus. We found that many area 2 neurons (26 of 112) exhibit clear curvature tuning, preferring contours pointing in a particular direction. Fewer area 2 neurons (15 of 112) show preferences for oriented bars. Because area 2 response patterns closely resembled SII patterns, we also compared area 2 and SII response time courses to characterize the temporal dynamics of curvature synthesis in the somatosensory system. We found that curvature representations develop and peak concurrently in area 2 and SII. These results reveal that transitions from orientation tuning to curvature selectivity in the somatosensory cortical hierarchy occur within SI rather than between SI and SII.</p>
</abstract>
<kwd-group><kwd>neurophysiology</kwd>
<kwd>touch</kwd>
<kwd>orientation</kwd>
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<kwd>single unit</kwd>
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<name sortKey="Yau, Jeffrey M" sort="Yau, Jeffrey M" uniqKey="Yau J" first="Jeffrey M." last="Yau">Jeffrey M. Yau</name>
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