HapticV1, Ncbi, Merge, bibRecord, 001254

Object Familiarity Modulates Effective Connectivity During Haptic Shape Perception

Identifieur interne : 001254 ( Ncbi/Merge ); précédent : 001253; suivant : 001255

Object Familiarity Modulates Effective Connectivity During Haptic Shape Perception

Auteurs : Gopikrishna Deshpande [États-Unis] ; Xiaoping Hu [États-Unis] ; Simon Lacey [États-Unis] ; Randall Stilla [États-Unis] ; K. Sathian [États-Unis]

Source :

NeuroImage [ 1053-8119 ] ; 2009.

RBID : PMC:3073838

English descriptors

KwdEn :
- Brain Mapping, Form Perception (physiology), Humans, Imagination (physiology), Magnetic Resonance Imaging, Neural Pathways (physiology), Recognition (Psychology) (physiology), Somatosensory Cortex (physiology).
MESH :
- physiology : Form Perception, Imagination, Neural Pathways, Recognition (Psychology), Somatosensory Cortex.
- Brain Mapping, Humans, Magnetic Resonance Imaging.

Abstract

In the preceding paper (Lacey et al., 2009), we showed that the activations evoked by visual imagery overlapped more extensively, and their magnitudes were more correlated, with those evoked during haptic shape perception of familiar, compared to unfamiliar, objects. Here we used task-specific analyses of functional and effective connectivity to provide convergent evidence. These analyses showed that the visual imagery and familiar haptic shape tasks activated similar networks, whereas the unfamiliar haptic shape task activated a different network. Multivariate Granger causality analyses of effective connectivity, in both a conventional form and one purged of zero-lag correlations, showed that the visual imagery and familiar haptic shape networks involved top-down paths from prefrontal cortex into the lateral occipital complex (LOC), whereas the unfamiliar haptic shape network was characterized by bottom-up, somatosensory inputs into the LOC. We conclude that shape representations in the LOC are flexibly accessible, either top-down or bottom-up, according to task demands, and that visual imagery is more involved in LOC activation during haptic shape perception when objects are familiar, compared to unfamiliar.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3073838

DOI: 10.1016/j.neuroimage.2009.08.052
PubMed: 19732841
PubMed Central: 3073838

Links toward previous steps (curation, corpus...)

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Links to Exploration step

PMC:3073838

Le document en format XML

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<front><div type="abstract" xml:lang="en"><p id="P1">In the preceding paper (<xref ref-type="bibr" rid="R12">Lacey et al., 2009</xref>
), we showed that the activations evoked by visual imagery overlapped more extensively, and their magnitudes were more correlated, with those evoked during haptic shape perception of familiar, compared to unfamiliar, objects. Here we used task-specific analyses of functional and effective connectivity to provide convergent evidence. These analyses showed that the visual imagery and familiar haptic shape tasks activated similar networks, whereas the unfamiliar haptic shape task activated a different network. Multivariate Granger causality analyses of effective connectivity, in both a conventional form and one purged of zero-lag correlations, showed that the visual imagery and familiar haptic shape networks involved top-down paths from prefrontal cortex into the lateral occipital complex (LOC), whereas the unfamiliar haptic shape network was characterized by bottom-up, somatosensory inputs into the LOC. We conclude that shape representations in the LOC are flexibly accessible, either top-down or bottom-up, according to task demands, and that visual imagery is more involved in LOC activation during haptic shape perception when objects are familiar, compared to unfamiliar.</p>
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<front><div type="abstract" xml:lang="en"><p id="P1">In the preceding paper (<xref ref-type="bibr" rid="R12">Lacey et al., 2009</xref>
), we showed that the activations evoked by visual imagery overlapped more extensively, and their magnitudes were more correlated, with those evoked during haptic shape perception of familiar, compared to unfamiliar, objects. Here we used task-specific analyses of functional and effective connectivity to provide convergent evidence. These analyses showed that the visual imagery and familiar haptic shape tasks activated similar networks, whereas the unfamiliar haptic shape task activated a different network. Multivariate Granger causality analyses of effective connectivity, in both a conventional form and one purged of zero-lag correlations, showed that the visual imagery and familiar haptic shape networks involved top-down paths from prefrontal cortex into the lateral occipital complex (LOC), whereas the unfamiliar haptic shape network was characterized by bottom-up, somatosensory inputs into the LOC. We conclude that shape representations in the LOC are flexibly accessible, either top-down or bottom-up, according to task demands, and that visual imagery is more involved in LOC activation during haptic shape perception when objects are familiar, compared to unfamiliar.</p>
</div>
</front>
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<author><name sortKey="Hu, Xiaoping" sort="Hu, Xiaoping" uniqKey="Hu X" first="Xiaoping" last="Hu">Xiaoping Hu</name>
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<author><name sortKey="Lacey, Simon" sort="Lacey, Simon" uniqKey="Lacey S" first="Simon" last="Lacey">Simon Lacey</name>
</author>
<author><name sortKey="Stilla, Randall" sort="Stilla, Randall" uniqKey="Stilla R" first="Randall" last="Stilla">Randall Stilla</name>
</author>
<author><name sortKey="Sathian, K" sort="Sathian, K" uniqKey="Sathian K" first="K" last="Sathian">K. Sathian</name>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">PubMed</idno>
<date when="2010">2010</date>
<idno type="doi">10.1016/j.neuroimage.2009.08.052</idno>
<idno type="RBID">pubmed:19732841</idno>
<idno type="pmid">19732841</idno>
<idno type="wicri:Area/PubMed/Corpus">001225</idno>
<idno type="wicri:Area/PubMed/Curation">001225</idno>
<idno type="wicri:Area/PubMed/Checkpoint">000F11</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title xml:lang="en">Object familiarity modulates effective connectivity during haptic shape perception.</title>
<author><name sortKey="Deshpande, Gopikrishna" sort="Deshpande, Gopikrishna" uniqKey="Deshpande G" first="Gopikrishna" last="Deshpande">Gopikrishna Deshpande</name>
<affiliation wicri:level="2"><nlm:affiliation>Coulter Department of Biomedical Engineering, Emory University & Georgia Institute of Technology, Atlanta, GA 30322, USA.</nlm:affiliation>
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Coulter Department of Biomedical Engineering, Emory University & Georgia Institute of Technology, Atlanta, GA 30322</wicri:regionArea>
<placeName><region type="state">Géorgie (États-Unis)</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Hu, Xiaoping" sort="Hu, Xiaoping" uniqKey="Hu X" first="Xiaoping" last="Hu">Xiaoping Hu</name>
</author>
<author><name sortKey="Lacey, Simon" sort="Lacey, Simon" uniqKey="Lacey S" first="Simon" last="Lacey">Simon Lacey</name>
</author>
<author><name sortKey="Stilla, Randall" sort="Stilla, Randall" uniqKey="Stilla R" first="Randall" last="Stilla">Randall Stilla</name>
</author>
<author><name sortKey="Sathian, K" sort="Sathian, K" uniqKey="Sathian K" first="K" last="Sathian">K. Sathian</name>
</author>
</analytic>
<series><title level="j">NeuroImage</title>
<idno type="eISSN">1095-9572</idno>
<imprint><date when="2010" type="published">2010</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Brain Mapping</term>
<term>Form Perception (physiology)</term>
<term>Humans</term>
<term>Imagination (physiology)</term>
<term>Magnetic Resonance Imaging</term>
<term>Neural Pathways (physiology)</term>
<term>Recognition (Psychology) (physiology)</term>
<term>Somatosensory Cortex (physiology)</term>
</keywords>
<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Form Perception</term>
<term>Imagination</term>
<term>Neural Pathways</term>
<term>Recognition (Psychology)</term>
<term>Somatosensory Cortex</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Brain Mapping</term>
<term>Humans</term>
<term>Magnetic Resonance Imaging</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">In the preceding paper (Lacey, S., Flueckiger, P., Stilla, R., Lava, M., Sathian, K., 2009a. Object familiarity modulates involvement of visual imagery in haptic shape perception), we showed that the activations evoked by visual imagery overlapped more extensively, and their magnitudes were more correlated, with those evoked during haptic shape perception of familiar, compared to unfamiliar, objects. Here we used task-specific analyses of functional and effective connectivity to provide convergent evidence. These analyses showed that the visual imagery and familiar haptic shape tasks activated similar networks, whereas the unfamiliar haptic shape task activated a different network. Multivariate Granger causality analyses of effective connectivity, in both a conventional form and one purged of zero-lag correlations, showed that the visual imagery and familiar haptic shape networks involved top-down paths from prefrontal cortex into the lateral occipital complex (LOC), whereas the unfamiliar haptic shape network was characterized by bottom-up, somatosensory inputs into the LOC. We conclude that shape representations in the LOC are flexibly accessible, either top-down or bottom-up, according to task demands, and that visual imagery is more involved in LOC activation during haptic shape perception when objects are familiar, compared to unfamiliar.</div>
</front>
</TEI>
</pubmed>
</double>
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	Serveur d'exploration sur les dispositifs haptiques
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Object Familiarity Modulates Effective Connectivity During Haptic Shape Perception

Object Familiarity Modulates Effective Connectivity During Haptic Shape Perception

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