Artificial hand illusions dynamics: Onset and fading of static rubber and virtual moving hand illusions

Perepelkina, O. V.; Vorobeva, Viktoriia P.; Мельникова, Ольга; Арина, Галина; Николаева, В.В.

doi:10.1016/j.concog.2018.09.005

Cited by 18 publications

(12 citation statements)

References 31 publications

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“…These delays may have been too long, such that any downregulation of the motor system could have 'worn off' by the cue to movement. Although we have no data on the duration of the after-effect of body disownership illusions, we know that the after-effects on limb ownership illusions [80] and full-body ownership illusions are quite longlived and can produce behavioural effects for many seconds after multisensory stimulation has stopped and the artificial body is no longer in view [18,81,82]. Lastly, it is also possible that the duration of visuotactile stimulation (13.5 seconds in experiment 1, 30 seconds in experiment 2 and 3) may have been too short to induce strong effects on later finger movement.…”

Section: Experimental Limitationsmentioning

confidence: 95%

Weakening the subjective sensation of own hand ownership does not interfere with rapid finger movements

Reader¹,

Ehrsson²

2019

Preprint

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When we perform a movement we generally have a clear distinction between which parts of the world constitute our body and which parts do not. However, how the sense of ownership over our body supports movement is not yet fully understood. We aimed to see whether a sense of ownership over the hand supports the performance of rapid hand movements. In three experiments (n=48, n=30, n=24), we presented participants with congruent and incongruent visuotactile and visuoproprioceptive information regarding their own hand. In keeping with previous experiments, multisensory disintegration resulted in a reduction in the subjective sensation of ownership over the hand, as reflected in questionnaire responses. Following sensory stimulation, participants were required to rapidly abduct their index finger whilst the movement was tracked. We examined the hypothesis that, should a sense of ownership over the limb be necessary for generating rapid movements with that limb, reaction time would increase when hand ownership was reduced, whilst the acceleration and velocity of the movement would decrease. We observed that reductions in own hand ownership did not interfere with rapid index finger abduction, suggesting that the motor system may not be reliant on a subjective sense of ownership over the body in order to generate movement.

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Section: Experimental Limitationsmentioning

confidence: 95%

Weakening the subjective sensation of own hand ownership does not interfere with rapid finger movements

Reader¹,

Ehrsson²

2019

Preprint

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“…On the one hand, the cognitive system may tend to retain previously incorporated entities in the body representation, as is, for example, suggested by feelings of phantom limbs after amputation (Flor et al, 1995;Ramachandran, Rogers-Ramachandran, & Cobb, 1995). A persistence model builds on these findings and assumes that newly embodied information remains integrated in the body representation unless incoming information actively contradicts the perception of an entity as belonging to the body (Preston & Newport, 2011), or by removing the entity altogether (Newport & Gilpin, 2011;Perepelkina et al, 2018). An updating model, by contrast, builds on theories that describe the body representation as a set of multisensory bindings (Blanke, 2012;Hoffmann et al, 2010;Maravita, Spence, & Driver, 2003;Tsakiris, 2017).…”

Section: Introductionmentioning

confidence: 99%

How to lose a hand: Sensory updating drives disembodiment

et al. 2020

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Body representations are readily expanded based on sensorimotor experience. A dynamic view of body representations, however, holds that these representations cannot only be expanded but that they can also be narrowed down by disembodying elements of the body representation that are no longer warranted. Here we induced illusory ownership in terms of a moving rubber hand illusion and studied the maintenance of this illusion across different conditions. We observed ownership experience to decrease gradually unless participants continued to receive confirmatory multisensory input. Moreover, a single instance of multisensory mismatch – a hammer striking the rubber hand but not the real hand – triggered substantial and immediate disembodiment. Together, these findings support and extend previous theoretical efforts to model body representations through basic mechanisms of multisensory integration. They further support an updating model suggesting that embodied entities fade from the body representation if they are not refreshed continuously.

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“…Furthermore, this compensatory effect of tactile information should depend on its complexity. Decreased complexity of spatiotemporal patterns of brush stroking-for instance, repetitive single-finger taps-renders visuo-tactile co-variance over space and time less informative (as illustrated by the fact that irregular and unpredictable stimulation patterns give rise to a more vivid illusion) [15]. Thus, we hypothesize that the magnitude of the effect of spatial distance on RHI strength will be proportional to the relative influence of proprioception, which should be greater when tactile information is more limited.…”

Section: Introductionmentioning

confidence: 99%

Tactile information counteracts the attenuation of rubber hand illusion attributable to increased visuo-proprioceptive divergence

2020

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Sense of body ownership is an immediate and distinct experience of one’s body as belonging to oneself. While it is well-recognized that ownership feelings emerge from the integration of visual and somatosensory signals, the principles upon which they are integrated are still intensely debated. Here, we used the rubber hand illusion (RHI) to examine how the interplay of visual, tactile, and proprioceptive signals is governed depending on their spatiotemporal properties. For this purpose, the RHI was elicited in different conditions varying with respect to the extent of visuo-proprioceptive divergence (i.e., the distance between the real and fake hands) and differing in terms of the availability and spatiotemporal complexity of tactile stimulation (none, simple, or complex). We expected that the attenuating effect of distance on illusion strength will be more pronounced in the absence of touch (when proprioception gains relatively higher importance) and absent in the presence of complex tactile signals. Additionally, we hypothesized that participants with greater proprioceptive acuity—assessed using an elbow joint position discrimination task—will be less susceptible to the illusion, but only under the conditions of limited tactile stimulation. In line with our prediction, RHI was attenuated at the farthest distance only when tactile information was absent or simplified, but the attenuation was effectively prevented by the use of complex tactile stimulation—in this case, RHI was comparably vivid at both distances. However, passive proprioceptive acuity was not related to RHI strength in either of the conditions. The results indicate that complex-structured tactile signals can override the influence of proprioceptive signals in body attribution processes. These findings extend our understanding of body ownership by showing that it is primarily determined by informative cues from the most relevant sensory domains, rather than mere accumulation of multisensory evidence.

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Artificial hand illusions dynamics: Onset and fading of static rubber and virtual moving hand illusions

Cited by 18 publications

References 31 publications

Weakening the subjective sensation of own hand ownership does not interfere with rapid finger movements

Weakening the subjective sensation of own hand ownership does not interfere with rapid finger movements

How to lose a hand: Sensory updating drives disembodiment

Tactile information counteracts the attenuation of rubber hand illusion attributable to increased visuo-proprioceptive divergence

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