Tool use changes the spatial extension of the magnetic touch illusion.

Guterstam, Arvid; Szczotka, Joanna; Zeberg, Hugo; Ehrsson, H. Henrik

doi:10.1037/xge0000390

Cited by 13 publications

(13 citation statements)

References 22 publications

(49 reference statements)

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“…More directly, Guterstam and colleagues have reported that when brushstrokes are applied in mid-air near participants hands concurrently with touch on their real hand, subjects report feeling a “magnetic touch illusion” 54 . Further, in line with PPS encoding, this illusion shows a non-linear decay at approximately 40 cm from the hand 54 , and this area of space increases following tool-use 55 . In turn, Guterstam and colleagues suggest that the “magnetic touch illusion” is a perceptual correlate of visuo-tactile integration in the PPS 54 , and taken together, these results imply that the PPS allows for the inference of putative touch by nearby objects.…”

Section: Introductionmentioning

confidence: 59%

“…Such probability changes the way multisensory signals are integrated/segregated and, because of this influence, the impact of PPS on perception may be indexed by using a task that measures the attraction of signals toward the expected mapping with different incongruences between multisensory signals (much as in Guterstam et al . 54 , 55 with the “magnetic touch illusion”). We can estimate the shape of the a priori visuo-proprioceptive coupling by asking participants to indicate where they perceive their finger (e.g., their left index) as well as visual cues in the environment.…”

Section: Introductionmentioning

confidence: 99%

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Peri-personal space as a prior in coupling visual and proprioceptive signals

Noel

Samad

Doxon

et al. 2018

Sci Rep

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It has been suggested that the integration of multiple body-related sources of information within the peri-personal space (PPS) scaffolds body ownership. However, a normative computational framework detailing the functional role of PPS is still missing. Here we cast PPS as a visuo-proprioceptive Bayesian inference problem whereby objects we see in our environment are more likely to engender sensations as they come near to the body. We propose that PPS is the reflection of such an increased a priori probability of visuo-proprioceptive coupling that surrounds the body. To test this prediction, we immersed participants in a highly realistic virtual reality (VR) simulation of their right arm and surrounding environment. We asked participants to perform target-directed reaches toward visual, proprioceptive, and visuo-proprioceptive targets while visually displaying their reaching arm (body visible condition) or not (body invisible condition). Reach end-points are analyzed in light of the coupling prior framework, where the extension of PPS is taken to be represented by the spatial dispersion of the coupling prior between visual and proprioceptive estimates of arm location. Results demonstrate that if the body is not visible, the spatial dispersion of the visuo-proprioceptive coupling relaxes, whereas the strength of coupling remains stable. By demonstrating a distance-dependent alteration in visual and proprioceptive localization attractive pull toward one another (stronger pull at small spatial discrepancies) when the body is rendered invisible – an effect that is well accounted for by the visuo-proprioceptive coupling prior – the results suggest that the visible body grounds visuo-proprioceptive coupling preferentially in the near vs. far space.

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Section: Introductionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Peri-personal space as a prior in coupling visual and proprioceptive signals

Noel

Samad

Doxon

et al. 2018

Sci Rep

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show abstract

“…More directly related to bodily self‐consciousness, a number of groups have shown that tactile stimulation of the body is not necessary to induce bodily illusions, but solely implying tactile sensation emanating from the PPS may elicit changes in bodily representation . Furthermore, these tactile predictions may have a phenomenological correlate . Guterstam and colleagues applied brushstrokes in mid‐air at some distance above a rubber hand—without touching it—and in synchrony applied brushstrokes to the participant's hidden hand.…”

Section: Bodily Self‐consciousnessmentioning

confidence: 99%

From multisensory integration in peripersonal space to bodily self‐consciousness: from statistical regularities to statistical inference

Noel

Blanke

Serino

2018

Annals of the New York Academy of Sciences

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Integrating information across sensory systems is a critical step toward building a cohesive representation of the environment and one's body, and as illustrated by numerous illusions, scaffolds subjective experience of the world and self. In the last years, classic principles of multisensory integration elucidated in the subcortex have been translated into the language of statistical inference understood by the neocortical mantle. Most importantly, a mechanistic systems-level description of multisensory computations via probabilistic population coding and divisive normalization is actively being put forward. In parallel, by describing and understanding bodily illusions, researchers have suggested multisensory integration of bodily inputs within the peripersonal space as a key mechanism in bodily self-consciousness. Importantly, certain aspects of bodily self-consciousness, although still very much a minority, have been recently casted under the light of modern computational understandings of multisensory integration. In doing so, we argue, the field of bodily self-consciousness may borrow mechanistic descriptions regarding the neural implementation of inference computations outlined by the multisensory field. This computational approach, leveraged on the understanding of multisensory processes generally, promises to advance scientific comprehension regarding one of the most mysterious questions puzzling humankind, that is, how our brain creates the experience of a self in interaction with the environment.

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“…However, haptic illusions such as these (see also Guterstam et al, 2011Guterstam et al, , 2018, while striking and unusual, lack the genuinely "impossible" character of the present phenomenon. In other words, sprouting a new nose or extending one's arm past its breaking point are certainly biologically implausible experiences; but the present phenomenon is not merely strange or unusual-it is physically or even conceptually incoherent.…”

Section: Discussionmentioning

confidence: 58%

"Impossible" somatosensation and the (ir)rationality of perception

Won¹,

Groß²,

Firestone³

2019

Preprint

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Impossible figures represent the world in ways it cannot be. From the work of M.C. Escher to any popular perception textbook, such experiences show how some principles of mental processing can be so entrenched and inflexible as to produce absurd and even incoherent outcomes that the perceiver knows cannot occur in reality. Surprisingly, however, such experiences have been conspicuously limited to visual perception; are there impossible experiences in other sensory modalities? Here, we modify a known conjurer’s trick to report the first impossible somatosensory experience — one that can be physically felt. We show that, even in full-cue conditions with objects that can be freely inspected, subjects can be made to experience a single object alone as feeling heavier than a group of objects that includes the single object as a member — an impossible and phenomenologically striking experience of weight. Impossibility can not only be seen, but also felt.

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Tool use changes the spatial extension of the magnetic touch illusion.

Cited by 13 publications

References 22 publications

Peri-personal space as a prior in coupling visual and proprioceptive signals

Peri-personal space as a prior in coupling visual and proprioceptive signals

From multisensory integration in peripersonal space to bodily self‐consciousness: from statistical regularities to statistical inference

"Impossible" somatosensation and the (ir)rationality of perception

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