HapticV1, PascalFrancis, Curation, bibRecord, 000D70

Enhanced Effectiveness in Visuo-Haptic Object-Selective Brain Regions with Increasing Stimulus Salience

Identifieur interne : 000D70 ( PascalFrancis/Curation ); précédent : 000D69; suivant : 000D71

Enhanced Effectiveness in Visuo-Haptic Object-Selective Brain Regions with Increasing Stimulus Salience

Auteurs : Sunah Kim [États-Unis] ; Thomas W. James [États-Unis]

Source :

Human brain mapping [ 1065-9471 ] ; 2010.

RBID : Pascal:10-0202528

Descripteurs français

Pascal (Inist)
- Pathologie du système nerveux, Encéphale, Stimulus, Intégration multisensorielle, Reconnaissance, Vision, Radiodiagnostic, Perception haptique.

English descriptors

KwdEn :
- Encephalon, Haptic perception, Multisensory integration, Nervous system diseases, Radiodiagnosis, Recognition, Stimulus, Vision.

Abstract

The occipital and parietal lobes contain regions that are recruited for both visual and haptic object processing. The purpose of the present study was to characterize the underlying neural mechanisms for bimodal integration of vision and haptics in these visuo-haptic object-selective brain regions to find out whether these brain regions are sites of neuronal or areal convergence. Our sensory conditions consisted of visual-only (V), haptic-only (H), and visuo-haptic (VH), which allowed us to evaluate integration using the superadditivity metric. We also presented each stimulus condition at two different levels of signal-to-noise ratio or salience. The salience manipulation allowed us to assess integration using the rule of inverse effectiveness. We were able to localize previously described visuo-haptic object-selective regions in the lateral occipital cortex (lateral occipital tactile-visual area) and the intraparietal sulcus, and also localized a new region in the left anterior fusiform gyrus. There was no evidence of superadditivity with the VH stimulus at either level of salience in any of the regions. There was, however, a strong effect of salience on multisensory enhancement: the response to the VH stimulus was more enhanced at higher salience across all regions. In other words, the regions showed enhanced integration of the VH stimulus with increasing effectiveness of the unisensory stimuli. We called the effect "enhanced effectiveness." The presence of enhanced effectiveness in visuo-haptic object-selective brain regions demonstrates neuronal convergence of visual and haptic sensory inputs for the purpose of processing object shape.

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Le document en format XML

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<front><div type="abstract" xml:lang="en">The occipital and parietal lobes contain regions that are recruited for both visual and haptic object processing. The purpose of the present study was to characterize the underlying neural mechanisms for bimodal integration of vision and haptics in these visuo-haptic object-selective brain regions to find out whether these brain regions are sites of neuronal or areal convergence. Our sensory conditions consisted of visual-only (V), haptic-only (H), and visuo-haptic (VH), which allowed us to evaluate integration using the superadditivity metric. We also presented each stimulus condition at two different levels of signal-to-noise ratio or salience. The salience manipulation allowed us to assess integration using the rule of inverse effectiveness. We were able to localize previously described visuo-haptic object-selective regions in the lateral occipital cortex (lateral occipital tactile-visual area) and the intraparietal sulcus, and also localized a new region in the left anterior fusiform gyrus. There was no evidence of superadditivity with the VH stimulus at either level of salience in any of the regions. There was, however, a strong effect of salience on multisensory enhancement: the response to the VH stimulus was more enhanced at higher salience across all regions. In other words, the regions showed enhanced integration of the VH stimulus with increasing effectiveness of the unisensory stimuli. We called the effect "enhanced effectiveness." The presence of enhanced effectiveness in visuo-haptic object-selective brain regions demonstrates neuronal convergence of visual and haptic sensory inputs for the purpose of processing object shape.</div>
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Enhanced Effectiveness in Visuo-Haptic Object-Selective Brain Regions with Increasing Stimulus Salience

Enhanced Effectiveness in Visuo-Haptic Object-Selective Brain Regions with Increasing Stimulus Salience

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Descripteurs français

English descriptors

Abstract

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Le document en format XML

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