Spatial limits on the nonvisual self-touch illusion and the visual rubber hand illusion: Subjective experience of the illusion and proprioceptive drift

Davies, Anne M. Aimola; White, Rebekah C.; Davies, Martin

doi:10.1016/j.concog.2013.03.006

Cited by 36 publications

(33 citation statements)

References 47 publications

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“…The proprioceptive reliability paradigm is consistent with the admin(istrating)-dominant drift found in their study. Admin-dominant asymmetry of the PD was reproduced in Aimola Davies et al (2013) with the identical experimental set when the distance between two hands (uncrossed) ranges from 15 to 60 cm.…”

Section: Introductionmentioning

confidence: 86%

“…In the studies of White et al (2011) and Aimola Davies et al (2013), the proprioceptive hand positions were recorded by orally reading the number on a ruler placed on top of a visual divider concealing the participant's hands below. To the best of the authors' knowledge, this is the only instance of measurement of two proprioceptive hand positions reported in STI studies.…”

Section: Methodsmentioning

confidence: 99%

“…In Experiment I, the participants were asked to complete a verbally administered questionnaire in which they rated their experiences of the following five perceptual effects conventionally adopted in previous STI studies (Ehrsson et al, 2005; White et al, 2011; Aimola Davies et al, 2013). …”

Section: Methodsmentioning

confidence: 99%

“…The strength of each perceptual effect was rated using a seven-point scale (0 = not at all; 1 = slightly agree; 3 = moderately agree; 5 = strongly agree; 6 = very strongly agree) as in the study of Aimola Davies et al (2013). The order of the five statements asked was randomized beforehand.…”

Section: Methodsmentioning

confidence: 99%

“…The stroke with the administrating hand should be simultaneous with the stroke on the receptive hand, and the two strokes should be in the same place anatomically. Therefore, the blinded participant's administrating hand's movement has been generally guided by the experimenter in inducing the STI (Ehrsson et al, 2005; White et al, 2011; Petkova et al, 2012; Aimola Davies et al, 2013). The STI thus induced is described as integration between the proprioceptive sense and the sense of touch.…”

Section: Introductionmentioning

confidence: 99%

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Crossed hands strengthen and diversify proprioceptive drift in the self-touch illusion

Kodaka

Ishihara

2014

Front. Hum. Neurosci.

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In the self-touch illusion (STI), some can feel that both hands are touching each other even when they are separated actually. This is achieved by giving synchronized touches to both hands. Because the STI involves both hands (an administrating hand and a receptive hand) of a single person, two types of proprioceptive drifts (PDs) simultaneously occur in such a way that both hands are attracted to each other. It is known that the PD distance is generally larger for the administrating hand than for the receptive hand when the two hands are uncrossed. However, it remains unclear why such an asymmetrical relationship is observed universally. In this study, we conducted two types of experiment to induce the STI. The first experiment involved four conditions combining a factor of “whether the hands are uncrossed or crossed” and a factor of “whether the administrating hand is resting or active on the surface,” with the receptive (left) hand located at the body's midline. The result demonstrated that crossing hands and resting on surface (ROS) induced the STI. Specifically, crossing hands enhanced the amount of PD distance by more than two or three times. Moreover, it is interesting that strong PD with dominance of the receptive hand, which did not appear in the uncrossed condition, was observed frequently. The second experiment collected seven “illusion-sensitive” participants from the first experiment, all of whom had a strong tendency to feel the self-touch, and examined the effect of the location of the body midline on the PD when hands are crossed with the administrating hand ROS. The result demonstrated that the dominant hand on the PD completely differed among participants, but was relatively stable over the midline position and time in the same person. We also found that a small number of participants exhibited quite a different pattern of the PD in the identical posture. On the basis of the results, we analyze in detail how the dominant hand on the PD is determined in the STI.

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Section: Introductionmentioning

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Crossed hands strengthen and diversify proprioceptive drift in the self-touch illusion

Kodaka

Ishihara

2014

Front. Hum. Neurosci.

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Changing the size of a mirror-reflected hand moderates the experience of embodiment but not proprioceptive drift: a repeated measures study on healthy human participants

2017

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Mirror visual feedback is used for reducing pain and visually distorting the size of the reflection may improve efficacy. The findings of studies investigating size distortion are inconsistent. The influence of the size of the reflected hand on embodiment of the mirror reflection is not known. The aim of this study was to compare the effect of magnifying and minifying mirror reflections of the hand on embodiment measured using an eight-item questionnaire and on proprioceptive drift. During the experiment, participants (n = 45) placed their right hand behind a mirror and their left hand in front of a mirror. Participants watched a normal-sized, a magnified and a minified reflection of the left hand while performing synchronised finger movements for 3 min (adaptive phase). Measurements of embodiment were taken before (pre) and after (post) synchronous movements of the fingers of both hands (embodiment adaptive phase). Results revealed larger proprioceptive drift post-adaptive phase (p = 0.001). Participants agreed more strongly with questionnaire items associated with location, ownership and agency of the reflection of the hand post-adaptive phase (p < 0.001) and when looking at the normal-sized reflection (p < 0.001). In conclusion, irrespective of size, watching a reflection of the hand while performing synchronised movements enhances the embodiment of the reflection of the hand. Magnifying and minifying the reflection of the hand has little effect on proprioceptive drift, but it weakens the subjective embodiment experience. Such factors need to be taken into account in future studies using this technique, particularly when assessing mirror visual feedback for pain management.

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Rubber hands in space: the role of distance and relative position in the rubber hand illusion

Kalckert¹,

Perera²,

Ganesan

et al. 2019

Exp Brain Res

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The rubber hand illusion (RHI) is a perceptual phenomenon in which participants experience ownership over a fake model hand through synchronous visuotactile stimulation. Several studies have shown that the illusion occurs only when both hands are in close proximity to each other. In the present study, we systematically examined the role of relative position (lateral, distal) and distance (13–75 cm) of the model hand (with respect to participants’ real hand) on illusion experience across both lateral and distal positions. Furthermore, we also compared different facets of the subjective illusion experience; the experience of the model hand being part of one’s body (i.e., ownership) and the perceptual fusion of vision and touch (i.e., referral of touch). In two experiments we observed indications for a stronger illusion experiences in distal compared to lateral positions of identical distances, indicating that the illusory effects may vary as a function of the relative position of the hand. Our results also showed that manipulations of distance differently modulated both facets of the illusion. While ownership was restricted to near distances, referral of touch sensations remained stable at farther distances. These results are interpreted in relation to variations in sensory weighting across different planes. Electronic supplementary material The online version of this article (10.1007/s00221-019-05539-6) contains supplementary material, which is available to authorized users.

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Spatial limits on the nonvisual self-touch illusion and the visual rubber hand illusion: Subjective experience of the illusion and proprioceptive drift

Cited by 36 publications

References 47 publications

Crossed hands strengthen and diversify proprioceptive drift in the self-touch illusion

Crossed hands strengthen and diversify proprioceptive drift in the self-touch illusion

Changing the size of a mirror-reflected hand moderates the experience of embodiment but not proprioceptive drift: a repeated measures study on healthy human participants

Rubber hands in space: the role of distance and relative position in the rubber hand illusion

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