Phantom Tactile Sensations Modulated by Body Position
Identifieur interne : 002293 ( Pmc/Checkpoint ); précédent : 002292; suivant : 002294Phantom Tactile Sensations Modulated by Body Position
Auteurs : Jared Medina ; Brenda RappSource :
- Current biology : CB [ 0960-9822 ] ; 2008.
Abstract
Various lines of evidence reveal bilateral activation of somatosensory areas after unilateral stimulation [
Url:
DOI: 10.1016/j.cub.2008.10.068
PubMed: 19062276
PubMed Central: 2701404
Affiliations:
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Phantom Tactile Sensations Modulated by Body Position</title>
<author><name sortKey="Medina, Jared" sort="Medina, Jared" uniqKey="Medina J" first="Jared" last="Medina">Jared Medina</name>
<affiliation><nlm:aff id="A1">Department of Neurology and Center for Cognitive Neuroscience, University of Pennsylvania</nlm:aff>
<wicri:noCountry code="subfield">University of Pennsylvania</wicri:noCountry>
</affiliation>
</author>
<author><name sortKey="Rapp, Brenda" sort="Rapp, Brenda" uniqKey="Rapp B" first="Brenda" last="Rapp">Brenda Rapp</name>
<affiliation><nlm:aff id="A2">Department of Cognitive Science, Johns Hopkins University</nlm:aff>
<wicri:noCountry code="subfield">Johns Hopkins University</wicri:noCountry>
</affiliation>
</author>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Phantom Tactile Sensations Modulated by Body Position</title>
<author><name sortKey="Medina, Jared" sort="Medina, Jared" uniqKey="Medina J" first="Jared" last="Medina">Jared Medina</name>
<affiliation><nlm:aff id="A1">Department of Neurology and Center for Cognitive Neuroscience, University of Pennsylvania</nlm:aff>
<wicri:noCountry code="subfield">University of Pennsylvania</wicri:noCountry>
</affiliation>
</author>
<author><name sortKey="Rapp, Brenda" sort="Rapp, Brenda" uniqKey="Rapp B" first="Brenda" last="Rapp">Brenda Rapp</name>
<affiliation><nlm:aff id="A2">Department of Cognitive Science, Johns Hopkins University</nlm:aff>
<wicri:noCountry code="subfield">Johns Hopkins University</wicri:noCountry>
</affiliation>
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<series><title level="j">Current biology : CB</title>
<idno type="ISSN">0960-9822</idno>
<idno type="eISSN">1879-0445</idno>
<imprint><date when="2008">2008</date>
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<front><div type="abstract" xml:lang="en"><title>Summary</title>
<p id="P1">Various lines of evidence reveal bilateral activation of somatosensory areas after unilateral stimulation [<xref ref-type="bibr" rid="R1">1</xref>
-<xref ref-type="bibr" rid="R6">6</xref>
] assumed to be mediated by cross-hemispheric connections [<xref ref-type="bibr" rid="R7">7</xref>
-<xref ref-type="bibr" rid="R11">11</xref>
]. Despite evidence of bilateral activity in response to unilateral stimulation, neurologically intact humans do not experience bilateral percepts when stimulated on one side of the body. This may be due to active suppression of ipsilateral neural activity [<xref ref-type="bibr" rid="R12">12</xref>
, <xref ref-type="bibr" rid="R13">13</xref>
] by inhibitory mechanisms whose functioning is poorly understood. We describe an individual with left fronto-parietal damage who experiences bilateral sensations in response to unilateral tactile stimulation—a rarely reported condition known as synchiria (previously described in visual [<xref ref-type="bibr" rid="R14">14</xref>
], auditory [<xref ref-type="bibr" rid="R15">15</xref>
] and somatosensory modalities [<xref ref-type="bibr" rid="R16">16</xref>
-<xref ref-type="bibr" rid="R19">19</xref>
]). Presumably the phantom sensations result from normal bilateral cross-hemispheric activation, combined with a failure of inhibitory mechanisms to prevent bilateral perceptual experiences. The disruption of these mechanisms provides a valuable opportunity to examine their internal functioning. We find that the synchiria rate is affected by hand position relative to multiple reference frames. Specifically, synchiria decreases as the hands move from right (contralesional) to left (ipsilesional) space in trunk- and head-centered reference frames and disappears when the hands are crossed. These findings provide, for the first time, evidence that the mechanisms that inhibit bilateral percepts operate in multiple reference frames [<xref ref-type="bibr" rid="R20">20</xref>
-<xref ref-type="bibr" rid="R27">27</xref>
].</p>
</div>
</front>
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<pmc article-type="research-article" xml:lang="EN"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<pmc-dir>properties manuscript</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-journal-id">9107782</journal-id>
<journal-id journal-id-type="pubmed-jr-id">8548</journal-id>
<journal-id journal-id-type="nlm-ta">Curr Biol</journal-id>
<journal-title>Current biology : CB</journal-title>
<issn pub-type="ppub">0960-9822</issn>
<issn pub-type="epub">1879-0445</issn>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">19062276</article-id>
<article-id pub-id-type="pmc">2701404</article-id>
<article-id pub-id-type="doi">10.1016/j.cub.2008.10.068</article-id>
<article-id pub-id-type="manuscript">NIHMS84900</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Article</subject>
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</article-categories>
<title-group><article-title>Phantom Tactile Sensations Modulated by Body Position</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Medina</surname>
<given-names>Jared</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Rapp</surname>
<given-names>Brenda</given-names>
</name>
<xref ref-type="aff" rid="A2">2</xref>
</contrib>
</contrib-group>
<aff id="A1"><label>1</label>
Department of Neurology and Center for Cognitive Neuroscience, University of Pennsylvania</aff>
<aff id="A2"><label>2</label>
Department of Cognitive Science, Johns Hopkins University</aff>
<author-notes><corresp id="CR1"><bold>Correspondence Address:</bold>
Jared Medina 3 West Gates Department of Neurology Hospital of the University of Pennsylvania Phone: 215−614−0274 Fax: 215−349−8260 e-mail: <email>jared.medina@uphs.upenn.edu</email>
</corresp>
<corresp id="CR2">Brenda Rapp Department of Cognitive Science Johns Hopkins University 237 Krieger Hall 3400 N Charles St Baltimore, MD 21218 Phone: 410−516−5250 Fax: 410−516−8020 e-mail: <email>brapp1@jhu.edu</email>
</corresp>
</author-notes>
<pub-date pub-type="nihms-submitted"><day>5</day>
<month>1</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub"><day>8</day>
<month>12</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="ppub"><day>23</day>
<month>12</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="pmc-release"><day>23</day>
<month>12</month>
<year>2009</year>
</pub-date>
<volume>18</volume>
<issue>24</issue>
<fpage>1937</fpage>
<lpage>1942</lpage>
<permissions><copyright-statement>© 2008 Elsevier Inc. All rights reserved.</copyright-statement>
<copyright-year>2008</copyright-year>
</permissions>
<abstract><title>Summary</title>
<p id="P1">Various lines of evidence reveal bilateral activation of somatosensory areas after unilateral stimulation [<xref ref-type="bibr" rid="R1">1</xref>
-<xref ref-type="bibr" rid="R6">6</xref>
] assumed to be mediated by cross-hemispheric connections [<xref ref-type="bibr" rid="R7">7</xref>
-<xref ref-type="bibr" rid="R11">11</xref>
]. Despite evidence of bilateral activity in response to unilateral stimulation, neurologically intact humans do not experience bilateral percepts when stimulated on one side of the body. This may be due to active suppression of ipsilateral neural activity [<xref ref-type="bibr" rid="R12">12</xref>
, <xref ref-type="bibr" rid="R13">13</xref>
] by inhibitory mechanisms whose functioning is poorly understood. We describe an individual with left fronto-parietal damage who experiences bilateral sensations in response to unilateral tactile stimulation—a rarely reported condition known as synchiria (previously described in visual [<xref ref-type="bibr" rid="R14">14</xref>
], auditory [<xref ref-type="bibr" rid="R15">15</xref>
] and somatosensory modalities [<xref ref-type="bibr" rid="R16">16</xref>
-<xref ref-type="bibr" rid="R19">19</xref>
]). Presumably the phantom sensations result from normal bilateral cross-hemispheric activation, combined with a failure of inhibitory mechanisms to prevent bilateral perceptual experiences. The disruption of these mechanisms provides a valuable opportunity to examine their internal functioning. We find that the synchiria rate is affected by hand position relative to multiple reference frames. Specifically, synchiria decreases as the hands move from right (contralesional) to left (ipsilesional) space in trunk- and head-centered reference frames and disappears when the hands are crossed. These findings provide, for the first time, evidence that the mechanisms that inhibit bilateral percepts operate in multiple reference frames [<xref ref-type="bibr" rid="R20">20</xref>
-<xref ref-type="bibr" rid="R27">27</xref>
].</p>
</abstract>
<contract-num rid="DC1">R01 DC006740-01</contract-num>
<contract-sponsor id="DC1">National Institute on Deafness and Other Communication Disorders : NIDCD</contract-sponsor>
</article-meta>
</front>
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<tree><noCountry><name sortKey="Medina, Jared" sort="Medina, Jared" uniqKey="Medina J" first="Jared" last="Medina">Jared Medina</name>
<name sortKey="Rapp, Brenda" sort="Rapp, Brenda" uniqKey="Rapp B" first="Brenda" last="Rapp">Brenda Rapp</name>
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