Visual Enhancing of Tactile Perception in the Posterior Parietal Cortex

Ro, Tony; Wallace, Ruth; Hagedorn, Judith C.; Farnè, Alessandro; Pienkos, Elizabeth

doi:10.1162/089892904322755520

Cited by 100 publications

(72 citation statements)

References 42 publications

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“…This suggests that VET might arise from a topdown modulation of SI from multisensory representations in the posterior parietal cortex (e.g., Graziano, Cooke, & Taylor, 2000;Làdavas & Farnè, 2004). This interpretation is consistent with findings that TMS applied either to SI (Fiorio & Haggard, 2005) or the posterior parietal cortex Touch and the Body 17 (Ro et al, 2004) disrupts VET. This selective relation between the behavioural effect and a single component identified by the PCA provides convergent validity that the PCA did indeed divide the questionnaire items in a theoretically meaningful way.…”

Section: Subjective Reports Of Rubber Hand Illusionsupporting

confidence: 84%

Visual Enhancement of Touch and the Bodily Self

Longo¹,

Cardozo²,

Haggard³

2007

PsycEXTRA Dataset

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In Press, Consciousness and CognitionWord Count: 4,388 Touch and the Body 2 Abstract We experience our own body through both touch and vision. We further see that others' bodies are similar to our own body, but we have no direct experience of touch on others' bodies.Therefore, relations between vision and touch are important for the sense of self and for mental representation of one's own body. For example, seeing the hand improves tactile acuity on the hand, compared to seeing a non-hand object. While several studies have demonstrated this visual enhancement of touch (VET) effect, its relation to the 'bodily self', or mental representation of one's own body remains unclear. We examined whether VET is an effect of seeing a hand, or of seeing my hand, using the rubber hand illusion. In this illusion, a prosthetic hand which is brushed synchronously -but not asynchronously -with one's own hand is felt to actually be one's hand. Thus, we manipulated whether or not participants felt like they were looking directly at their hand, while holding the actual stimulus they viewed constant. Tactile acuity was measured by having participants judge the orientation of square-wave gratings. Two characteristic effects of VET were observed: (1) cross-modal enhancement from seeing the hand was inversely related to overall tactile acuity, and (2) participants near sensory threshold showed significant improvement following synchronous stroking, compared to asynchronous stroking or no stroking at all. These results demonstrate a clear functional relation between the bodily self and basic tactile perception.

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Section: Subjective Reports Of Rubber Hand Illusionsupporting

confidence: 84%

Visual Enhancement of Touch and the Bodily Self

Longo¹,

Cardozo²,

Haggard³

2007

PsycEXTRA Dataset

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“…This spatio-temporal pattern is consistent with a visually driven PPC exerting modulatory influences on somatosensory cortex activity, and this top-down signal may specifically affect S1 rather than secondary somatosensory cortex circuits [21]. Prolonged visual stimulation can even serve to recalibrate tactile sensitivity, and this recalibration relies on an intact PPC [23]. Finally, auditory stimulation that is localized near the hand can similarly enhance touch, and this facilitation is also abolished by rTMS targeting PPC [24].…”

Section: (Iii) Mediating Crossmodal Interactions In Sensory Cortexsupporting

confidence: 71%

Dissecting neural circuits for multisensory integration and crossmodal processing

Yau

DeAngelis

Angelaki

2015

Phil. Trans. R. Soc. B

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One contribution of 15 to a theme issue 'Controlling brain activity to alter perception, behaviour and society'. We rely on rich and complex sensory information to perceive and understand our environment. Our multisensory experience of the world depends on the brain's remarkable ability to combine signals across sensory systems. Behavioural, neurophysiological and neuroimaging experiments have established principles of multisensory integration and candidate neural mechanisms. Here we review how targeted manipulation of neural activity using invasive and non-invasive neuromodulation techniques have advanced our understanding of multisensory processing. Neuromodulation studies have provided detailed characterizations of brain networks causally involved in multisensory integration. Despite substantial progress, important questions regarding multisensory networks remain unanswered. Critically, experimental approaches will need to be combined with theory in order to understand how distributed activity across multisensory networks collectively supports perception.

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“…For example, Iriki et al (1996) described neurons in the anterior bank of the intraparietal sulcus that respond to tactile stimulation on the contralateral hand and also respond to visual stimuli in the vicinity of that hand, and the visual receptive fields of these neurons "follow" the hand as it moves. This bimodal system may contribute directly to tactile perception, or it may influence responses within somatosensory regions in the anterior parietal cortex (Taylor-Clarke et al, 2002;Ro et al, 2004;Fiorio and Haggard, 2005). In line with physiological evidence, these bimodal neurons would be activated by somatosensory input alone (e.g., during the adapting vibration while view of the hand was obscured by an opaque surface) and also by visual input alone (when the participant viewed their hand while no tactile stimuli were presented), and these inputs would combine when participants see their hand during tactile stimulation.…”

Section: Discussionmentioning

confidence: 99%

Noninformative Vision Causes Adaptive Changes in Tactile Sensitivity

Harris¹,

Arabzadeh²,

Moore³

et al. 2007

J. Neurosci.

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The last few years have witnessed a rapid growth of research investigating how information is integrated across sensory modalities, a process at the core of our everyday perceptual experiences. The present study focuses on the integration of vision and touch and, in particular, how tactile perception is affected by a view of the relevant body part containing no information about the tactile stimulus itself. Previous studies have established that this "noninformative vision" can improve subsequent tactile discrimination (Kennett et al., 2001; Taylor-Clarke et al., 2004a), a finding we confirm in the present study. However, we also report here that noninformative vision impairs the detection of tactile stimuli and the discrimination of near-threshold stimuli. These effects are shown to resemble, and indeed combine additively with, shifts in discrimination and detection thresholds produced by adaptation to suprathreshold tactile stimulation. We conclude that noninformative vision of the body does not simply enhance somatosensory processing, but rather it induces adaptive changes in tactile sensitivity via shifts in gain control operating within a bimodal sensory system. This constitutes a novel means by which vision of the body can alter tactile perception.

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Visual Enhancing of Tactile Perception in the Posterior Parietal Cortex

Cited by 100 publications

References 42 publications

Visual Enhancement of Touch and the Bodily Self

Visual Enhancement of Touch and the Bodily Self

Dissecting neural circuits for multisensory integration and crossmodal processing

Noninformative Vision Causes Adaptive Changes in Tactile Sensitivity

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