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A PUTATIVE MODEL OF MULTISENSORY OBJECT REPRESENTATION

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A PUTATIVE MODEL OF MULTISENSORY OBJECT REPRESENTATION

Auteurs : Simon Lacey [États-Unis] ; Noa Tal [Israël] ; Amir Amedi [Israël] ; K. Sathian [États-Unis]

Source :

Brain topography [ 0896-0267 ] ; 2009.

RBID : PMC:3156680

Abstract

This review surveys the recent literature on visuo-haptic convergence in the perception of object form, with particular reference to the lateral occipital complex (LOC) and the intraparietal sulcus (IPS) and discusses how visual imagery or multisensory representations might underlie this convergence. Drawing on a recent distinction between object- and spatially-based visual imagery, we propose a putative model in which LOtv, a subregion of LOC, contains a modality-independent representation of geometric shape that can be accessed either bottom-up from direct sensory inputs or top-down from frontoparietal regions. We suggest that such access is modulated by object familiarity: spatial imagery may be more important for unfamiliar objects and involve IPS foci in facilitating somatosensory inputs to the LOC; by contrast, object imagery may be more critical for familiar objects, being reflected in prefrontal drive to the LOC.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3156680

DOI: 10.1007/s10548-009-0087-4
PubMed: 19330441
PubMed Central: 3156680

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<front><div type="abstract" xml:lang="en"><p id="P1">This review surveys the recent literature on visuo-haptic convergence in the perception of object form, with particular reference to the lateral occipital complex (LOC) and the intraparietal sulcus (IPS) and discusses how visual imagery or multisensory representations might underlie this convergence. Drawing on a recent distinction between object- and spatially-based visual imagery, we propose a putative model in which LOtv, a subregion of LOC, contains a modality-independent representation of geometric shape that can be accessed either bottom-up from direct sensory inputs or top-down from frontoparietal regions. We suggest that such access is modulated by object familiarity: spatial imagery may be more important for unfamiliar objects and involve IPS foci in facilitating somatosensory inputs to the LOC; by contrast, object imagery may be more critical for familiar objects, being reflected in prefrontal drive to the LOC.</p>
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  <front><journal-meta><journal-id journal-id-type="nlm-journal-id">8903034</journal-id>
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<contrib-group><contrib contrib-type="author"><name><surname>Lacey</surname>
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<aff id="A1"><label>1</label>
Department of Neurology, Emory University, Atlanta, GA, USA</aff>
<aff id="A2"><label>2</label>
Physiology Department, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91220, Israel</aff>
<aff id="A3"><label>3</label>
Cognitive Science Program, The Hebrew University of Jerusalem, Jerusalem 91220, Israel</aff>
<aff id="A4"><label>4</label>
Department of Rehabilitation Medicine, Emory University, Atlanta, GA, USA</aff>
<aff id="A5"><label>5</label>
Department of Psychology, Emory University, Atlanta, GA, USA</aff>
<aff id="A6"><label>6</label>
Rehabilitation R&D Center of Excellence, Atlanta VAMC, Decatur, GA, USA</aff>
<author-notes><corresp id="CR1"><bold>Corresponding author:</bold>
 K. Sathian Department of Neurology Emory University School of Medicine WMB-6000, 101 Woodruff Circle Atlanta GA 30322 USA Tel: 404-727-1366 Fax: 404-727-3157 <email>krish.sathian@emory.edu</email>
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<abstract><p id="P1">This review surveys the recent literature on visuo-haptic convergence in the perception of object form, with particular reference to the lateral occipital complex (LOC) and the intraparietal sulcus (IPS) and discusses how visual imagery or multisensory representations might underlie this convergence. Drawing on a recent distinction between object- and spatially-based visual imagery, we propose a putative model in which LOtv, a subregion of LOC, contains a modality-independent representation of geometric shape that can be accessed either bottom-up from direct sensory inputs or top-down from frontoparietal regions. We suggest that such access is modulated by object familiarity: spatial imagery may be more important for unfamiliar objects and involve IPS foci in facilitating somatosensory inputs to the LOC; by contrast, object imagery may be more critical for familiar objects, being reflected in prefrontal drive to the LOC.</p>
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A PUTATIVE MODEL OF MULTISENSORY OBJECT REPRESENTATION

A PUTATIVE MODEL OF MULTISENSORY OBJECT REPRESENTATION

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Abstract

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