HapticV1, PubMed, Corpus, bibRecord, 001225

Object familiarity modulates effective connectivity during haptic shape perception.

Identifieur interne : 001225 ( PubMed/Corpus ); précédent : 001224; suivant : 001226

Object familiarity modulates effective connectivity during haptic shape perception.

Auteurs : Gopikrishna Deshpande ; Xiaoping Hu ; Simon Lacey ; Randall Stilla ; K. Sathian

Source :

NeuroImage [ 1095-9572 ] ; 2010.

RBID : pubmed:19732841

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, 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.

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

Links to Exploration step

pubmed:19732841

Le document en format XML

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<author><name sortKey="Deshpande, Gopikrishna" sort="Deshpande, Gopikrishna" uniqKey="Deshpande G" first="Gopikrishna" last="Deshpande">Gopikrishna Deshpande</name>
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<author><name sortKey="Lacey, Simon" sort="Lacey, Simon" uniqKey="Lacey S" first="Simon" last="Lacey">Simon Lacey</name>
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<author><name sortKey="Stilla, Randall" sort="Stilla, Randall" uniqKey="Stilla R" first="Randall" last="Stilla">Randall Stilla</name>
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<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>
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	Serveur d'exploration sur les dispositifs haptiques
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Serveur d'exploration sur les dispositifs haptiques

Object familiarity modulates effective connectivity during haptic shape perception.

Object familiarity modulates effective connectivity during haptic shape perception.

Source :

English descriptors

Abstract

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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Pour générer des pages wiki