Visuo-tactile integration

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1 Multisensory Peripersonal Illusions Corps et cognition: l'embodiment Corrado Corradi-Dell Acqua Theory of Pain Laboratory Visuo-tactile integration Multisensory receptive fields 1

2 Reference Frames Reference Frames Graziano et al Audio-visual-tactile integration 2

Parieto-frontal interactions, personal space, and defensive behavior. Neuropsychologia. 44:845-859.

3 Multisensory integration in macaques The neurons in vips and PZ could be described as looming detectors. An object touching, near, or approaching the receptive field will usually drive the neuron. Graziano & Cooke (2006). Parieto-frontal interactions, personal space, and defensive behavior. Neuropsychologia. 44: Multiple-representation of peripersonal space (PPS) Tactile Extinction Brain damaged patients with somatosensory deficits might exhibit extinction, the inability to detect contralesional stimuli only under the condition of double simultaneous stimulation. Bender (1952); Mattingley et al. (1997) 3

4 Crossmodal Extinction Crossmodal Congruency Task in human IPS vips intergrates visuo-tactile (& auditory) information: approaching movement object observation/manupulation Bremmer et al. (2001) Neuron; Grefkes et al. (2002) Neuron 4

5 in human IPS near far near far Makin et al. (2007) J. Neurosci in human IPS Posterior IPS Makin et al. (2007) J. Neurosci in human IPS near near far far Makin et al. (2007) J. Neurosci 5

6 in human IPS Anterior/Ventral IPS Makin et al. (2007) J. Neurosci in human IPS NEAR FAR Brozzoli et al. (2012) J. Neurosci in human IPS Sychr Asynch Brozzoli et al. (2012) J. Neurosci 6

in human PPC Was I touched in the index or in the pinky finger?

TMS on PPC blocks such visuotactile facilitation Pasalar et al. (2010) Eur. J.

Phosphenes The artificial stimulation of the primary visual cortex cortex

of the visual field Tactile-Proprioceptive-Visual Integration TMS-induced

7 in human PPC Was I touched in the index or in the pinky finger? A congruent visual pointer helps discrimination. TMS on PPC blocks such visuotactile facilitation Pasalar et al. (2010) Eur. J. Neurosci. Phosphenes The artificial stimulation of the primary visual cortex cortex with TMS, can induce transient visual illusion in the corresponding portion of the visual field Tactile-Proprioceptive-Visual Integration TMS-induced phosphenes in a spatial location ( body side) of the visual field congruent with the location of a tactile stimulation improves tactile acuitiy. Bolognini N & Maravita A (2007) Curr. Biology 7

Tactile-Proprioceptive-Visual Integration in PPC rtms on S1 impairs the congruency effect (in general) rtms on PPC inverts the congruency effect when the arms are crossed Bolognini N & Maravita A

8 Tactile-Proprioceptive-Visual Integration in PPC rtms on S1 impairs the congruency effect (in general) rtms on PPC inverts the congruency effect when the arms are crossed Bolognini N & Maravita A (2007) Curr. Biology Tactile-Proprioceptive-Visual Integration in PPC After TMS on PPC there is congruency effect, but is associated with the body side ( spatial location) PPC is also involved in remapping the location of tactile events within the external space Bolognini N & Maravita A (2007) Curr. Biology Audio-Tactile-Interaction Task «weak or strong touch?» Blindfolded 8

9 Audio-Tactile-Interaction Task Audio-Tactile-Interaction Task Audio-Tactile-Interaction Task 9

10 Conclusion PPS Network PPS extends after tool-use PPS extends after tool-use Maravita & Iriki (2004). Tools for the body (schema). TICS 10

11 Crossmodal congruency is affected by tool-use Maravita & Iriki (2004). Tools for the body (schema). TICS Audio-Tactile-Interaction is affected by tool-use Sighted Individuals Serino et al., (2007). Psych. Sci. Audio-Tactile-Interaction is affected by tool-use Serino et al., (2007). Psych. Sci. 11

12 Audio-Tactile-Interaction is affected by tool-use Canzoneri et al., (2013). EBR Audio-Tactile-Interaction is affected by tool-use Canzoneri et al., (2013). EBR Audio-Tactile-Interaction is affected by tool-use Canzoneri et al., (2013). EBR 12

13 PPS is affected by immobilization Bassolino et al., (2015). Neuropsychologia PPS is affected by Full Body Illusion Noel et al., (2015). Cognition Hand-Blink Reflex Sambo et al., (2012). J. Neurosci 13

14 Hand-Blink Reflex Sambo et al., (2012). J. Neurosci Hand-Blink Reflex Sambo et al., (2012). J. Neurosci Hand-Blink Reflex Sambo et al., (2013). J. Neurosci 14

Conclusion The representation of peripersonal space: Multimodal integrates somatic sensations on one s body parts with visual/auditory information about events close to that body part.

15 Conclusion The representation of peripersonal space: Multimodal integrates somatic sensations on one s body parts with visual/auditory information about events close to that body part. Body-part-specific different representations exist, subserving specific parts of the body. It is modulated by tool use. It is modulated by personal traits, such as anxiety. Multiple s? Body Schema vs. Body Image (an egocentric reference frame for directing our actions in the external space vs. an object with invariant properties) Working PPS vs. Defensive PPS an egocentric reference frame from planning/directing our action in the external space Working PPS a representation of potential threats approaching the body (used for perceptual purposes) Defensive PPS De Vignemont & Iannetti (2015). Neuropsychologia Multiple s? De Vignemont & Iannetti (2015). Neuropsychologia 15

Extending or projecting peripersonal space with tools? Multisensory interactions highlight only the distal and proximal ends of tools

Neuroscience Letters 372 (2004) 62 67 Extending or projecting peripersonal space with tools? Multisensory interactions highlight only the distal and proximal ends of tools Nicholas P. Holmes a,, Gemma