Spontaneous imitative movements induced by an illusory embodied fake hand

Shibuya, Satoshi; Unenaka, Satoshi; Zama, Takuro; Shimada, Sotaro; Ohki, Yukari

doi:10.1016/j.neuropsychologia.2018.01.023

Cited by 25 publications

(41 citation statements)

References 57 publications

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“…Our findings join to recent evidence on the link between synchronicity and enhanced Mu suppression (Shibuya et al, 2018). At the same time, they seemingly conflict with previous findings on reduced Mu suppression under synchronous visuotactile stimulation (Evans and Blanke, 2013;Lenggenhager et al, 2011).…”

Section: Mu Suppression As An Indication For Enhanced Sensorimotor Secontrasting

confidence: 72%

“…Mu suppression isShibuya et als' work was found after the synchronous stroking, possibly reflecting induced enhancement of back projection of the MNS to sensory circuits(Shibuya et al, 2018).These findings can therefore be seen as a replication of Shibuya et al's observations about the effects of synchronous visuotactile stimulation over Mu power vis-à-vis spontaneous movements in a fully virtual environment. Our findings further suggest that the Mu power may be induced not only by synchronicity of bottom-up tactile and visual cueing, but also by the congruence of top-down presentations.In regard to the synchronicity effect, it should be emphasized that since the induction phase (stroking) was temporally separated from the probe phase (bouncing hands), the enhanced suppression is unlikely to reflect an increased attentional focus on the correlated compared to the uncorrelated multisensory stimulation.…”

supporting

confidence: 76%

“…As the average measured vertical displacement of the participant's real hand was below detection threshold and trials with extreme movements (<2.5 std) were discarded from analysis, it is reasonable to interpret the Mu modulations by SYN and AH as reflecting mainly motor activations by visual input. To restate Shibuya et al's interpretation of their similar findings (Shibuya et al, 2018), the enhanced Mu suppression in SYN and AH possibly reflects increased back projection of sensory information about self-motion. As mentioned above, evidence suggests that the MNS encodes not only motor information about own motions and perceptual information about others' motions, but also perceptual information about own motions.…”

Section: Mu Suppression As An Indication For Enhanced Sensorimotor Sementioning

confidence: 62%

“…Lenggenhager and colleagues (Lenggenhager et al, 2011) similarly reported on reduced Mu suppression effect when comparing synchronous and asynchronous stroking on the back of the participant's and an avatar's back. In a recent work (Shibuya et al, 2018) the authors employed visuotactile stimulation to induce ownership over a real-time video recorded model hand. The synchronous and asynchronous blocks were intersected with single fingers abduction and adduction sequences performed by the model.…”

Section: Introductionmentioning

confidence: 99%

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Electroencephalographic evidence for the involvement of mirror neuron and error monitoring related processes in virtual body ownership

Raz

Gurevitch

Vaknin

et al. 2019

Preprint

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The illusion that an artificial or virtual object becomes part of one's body has been demonstrated and productively investigated in the past two decades. Empirical and theoretical accounts of this phenomenon suggest that the body ownership illusion relies not on a single process, but rather on the alignment of the biological and the alternative bodies across multiple aspects. However, the portrayal of these aspects and the demarcation of their neurophysiological correlates has yet to be established.Our study examines electroencephalographic (EEG) markers of two extensively studied systems in the context of virtual body ownership illusion: the mirror neuron system (MNS) and the error monitoring system (EMS). We designed an experimental manipulation of brief involuntary virtual hand bounces, which triggers both systems, and examined how the response of EEG markers of these systems to this manipulation is modulated by three aspects of body ownership: agency, visuotactile synchronicity, and semantic congruence between the participant's hands and its virtual representation.We found evidence for enhanced MNS-related suppression of power at the Mu band in the synchronous and semantic congruence conditions. On the other hand, the EMS-related Pe/P300 wave was reduced by semantic congruence. This Pe/P300 effect was stronger among participants who exhibited higher acceptance of the spatial illusion and increased tendency for affective empathy. Mu power and Pe/P300 were not correlated, suggesting a dissociation between the distinct aspects of body ownership they probe. The findings suggest that synchronicity and semantic congruence induce sensorimotor sensitivity to the alternative body, whereas the latter parameter also buffers minor erroneous virtual motions. These neurophysiological markers may be added to the arsenal of body ownership probes, and integrated in VR rehabilitation protocols.

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Section: Mu Suppression As An Indication For Enhanced Sensorimotor Secontrasting

confidence: 72%

supporting

confidence: 76%

Section: Mu Suppression As An Indication For Enhanced Sensorimotor Sementioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

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Electroencephalographic evidence for the involvement of mirror neuron and error monitoring related processes in virtual body ownership

Raz

Gurevitch

Vaknin

et al. 2019

Preprint

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“…These findings were later attributed to the high weighting of the visual input 38 , and it was further shown, using a computational model, how attention benefited visual cues in a conflicting situation biasing the action 39 . Besides, it was observed that reactive movements were induced in participants during the RHI experiment when the artificial hand was moved 40 .…”

Section: Introductionmentioning

confidence: 99%

Active Strategies for Multisensory Conflict Suppression in the Virtual Hand Illusion

Lanillos

Franklin

2020

Preprint

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AbstractThe perception of our body in space is flexible and manipulable. The predictive brain hypothesis explains this malleability as a consequence of the interplay between incoming sensory information and our body expectations. However, given the interaction between perception and action, we might also expect that actions would arise due to prediction errors, especially in conflicting situations. Here we describe a computational model, based on the free-energy principle, that forecasts involuntary forces in sensorimotor conflicts. We experimentally confirm those predictions in humans by means of a virtual reality rubber-hand illusion. Participants generated reactive arm forces towards the virtual hand, regardless of its location with respect to the real arm, with little to no forces produced when the virtual hand overlaid their physical hand. The congruency of our model predictions and human observations shows that the brain-body is generating actions to reduce the prediction error between the expected arm location and the new visual arm. This observed unconscious mechanism is an empirical validation of the perception-action duality in body adaptation to uncertain situations and evidence of the active component of predictive processing.Public abstractHumans’ capacity to perceive and control their body in space is central in awareness, adaptation and safe interaction. From low-level body perception to body-ownership, discovering how the brain represents the body and generates actions is of major importance for cognitive science and also for robotics and artificial intelligence. The present study shows that humans generate involuntary actions to correct the expected location of the body, which corresponds to reducing the prediction error. This means that the brain adapts to conflicting or uncertain information from the senses by unconsciously acting in the world.

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Neural mechanisms underlying the Rubber Hand Illusion: A systematic review of related neurophysiological studies

et al. 2021

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Spontaneous imitative movements induced by an illusory embodied fake hand

Cited by 25 publications

References 57 publications

Electroencephalographic evidence for the involvement of mirror neuron and error monitoring related processes in virtual body ownership

Electroencephalographic evidence for the involvement of mirror neuron and error monitoring related processes in virtual body ownership

Active Strategies for Multisensory Conflict Suppression in the Virtual Hand Illusion

Neural mechanisms underlying the Rubber Hand Illusion: A systematic review of related neurophysiological studies

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