A novel manipulation method of human body ownership using an fMRI-compatible master–slave system

Hara, Masayuki; Salomon, Roy; Zwaag, Wietske van der; Kober, Tobias; Rognini, Giulio; Nabae, Hiroyuki; Yamamoto, Akio; Blanke, Olaf; Higuchi, Toshiro

doi:10.1016/j.jneumeth.2014.05.038

Cited by 22 publications

(22 citation statements)

References 48 publications

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“…The results of the proprioceptive drift, an implicit measure of body ownership, show that active self-touch induces a larger mislocalization of the hand compared to tactile stimulation alone, suggesting that such proprioceptive error may also be affected by efferent predictive signals. A similar result has also been recently found using active self-touch in the context of the Full Body Illusion where synchronous active touch caused changes in subjective experience (Hara et al, 2014 ) and a larger proprioceptive drift of the full body compared to asynchronous tactile feedback (Blanke et al, 2014 ).…”

Section: Discussionsupporting

confidence: 80%

Voluntary self-touch increases body ownership

et al. 2015

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Experimental manipulations of body ownership have indicated that multisensory integration is central to forming bodily self-representation. Voluntary self-touch is a unique multisensory situation involving corresponding motor, tactile and proprioceptive signals. Yet, even though self-touch is frequent in everyday life, its contribution to the formation of body ownership is not well understood. Here we investigated the role of voluntary self-touch in body ownership using a novel adaptation of the rubber hand illusion (RHI), in which a robotic system and virtual reality allowed participants self-touch of real and virtual hands. In the first experiment, active and passive self-touch were applied in the absence of visual feedback. In the second experiment, we tested the role of visual feedback in this bodily illusion. Finally, in the third experiment, we compared active and passive self-touch to the classical RHI in which the touch is administered by the experimenter. We hypothesized that active self-touch would increase ownership over the virtual hand through the addition of motor signals strengthening the bodily illusion. The results indicated that active self-touch elicited stronger illusory ownership compared to passive self-touch and sensory only stimulation, and show an important role for active self-touch in the formation of bodily self.

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Section: Discussionsupporting

confidence: 80%

Voluntary self-touch increases body ownership

et al. 2015

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“…Replicating the induction of somatic passivity based on sensorimotor stimulation in a healthy population using a robotic procedure 39,65,66 we investigated potential links with voice perception and clinical phenomenology (i.e. AVHs) and demonstrate that voice perception is modulated by sensorimotor stimulation with somatosensory feedback.…”

Section: Discussionmentioning

confidence: 99%

Sensorimotor conflicts induce somatic passivity and louden quiet voices in healthy listeners

Orepic

Rognini

Kannape

et al. 2020

Preprint

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Word count: Abstract: 234 Text body with abstract: 3981 2 Abstract Sensorimotor conflicts are known to alter the perception of accompanying sensory signals and deficits in sensory attenuation have been observed in schizophrenia. In the auditory domain, selfgenerated tones or voices (compared to tones or voices presented passively or with sensorimotor delays) have been associated with changes in loudness perception and attenuated neural responses. It has been argued that for sensory signals to be attenuated, predicted and sensory consequences must have a consistent spatiotemporal relationship, between button presses and reafferent tactile signals, via predictive sensory signaling, a process altered in schizophrenia.Here, we investigated auditory sensory attenuation for a series of morphed voices while healthy participants applied sensorimotor stimulations that had no spatiotemporal relationship to the voice stimuli and that have been shown to induce mild psychosis-like phenomena. In two independent groups of participants, we report a loudening of silent voices and found this effect only during maximal sensorimotor conflicts (versus several control conditions). Importantly, conflicting sensorimotor stimulation also induced a mild psychosis-like state in the form of somatic passivity and participants who experienced stronger passivity lacked the sensorimotor loudening effect. We argue that this conflict-related sensorimotor loudness amplification may represent a reduction of auditory self-attenuation that is lacking in participants experiencing a concomitant mild psychosis-like state. We interpret our results within the framework of the comparator model of sensorimotor control, and discuss the implications of our findings regarding passivity experiences and hallucinations in schizophrenia.

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“…1). Because we already verified that only synchronous active self-touch induced the FBI [39], the present study compared this active self-touch-enabled FBI (a-FBI) to an FBI induced by synchronous passive visuotactile stimulation which was based on preliminary-recorded self-touch actions by the experimenter (the latter condition corresponded with previous experiments using the classical FBI [21]; c-FBI). In line with previous findings of sensorimotor signals on hand ownership, as tested during movement [3], [29] and self-touch [37], [40], we predicted that such sensorimotor signals may also contribute to ownership over the entire body.…”

Section: Introductionmentioning

confidence: 89%

“…A custom-made robotic system designed to adapt to both 3T and 7T MRI environments [39] was applied to induce the FBI in the participants while in a supine position (see Fig. 2).…”

Section: B Experimental Setups 1) Leader and Follower Robotsmentioning

confidence: 99%

“…Here, we experimentally investigate the effect of active selftouch on the ownership of the entire body, as tested using the RHI [37]. To achieve this, we employed a custom-made leader-follower robotic system [39], allowing participants to interactively touch a virtual body while experiencing synchronous or asynchronous touch on their real bodies (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Modulation of Bodily Self-Consciousness by Self and External Touch

Hara

Kanayama

Blanke

et al. 2021

IEEE Trans. Haptics

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The full body illusion (FBI) is a bodily illusion based on the application of multisensory conflicts that induce changes in bodily self-consciousness (BSC). This has been used to study cognitive brain mechanisms underlying body ownership and related aspects of self-consciousness. Typically, such paradigms employ external passive multisensory stimulation, thus neglecting the possible contributions of self-generated action and haptic cues to body ownership. In this study, the effects of both external and voluntary self-touch on BSC were examined with a robotics-based FBI paradigm. We compared the effects of classical passive visuotactile stimulation and active self-touch (in which experimental participants had a sense of agency over the tactile stimulation) on the FBI. We evaluated these effects using a questionnaire, crossmodal congruency task, and measurements of changes in self-location. The results indicated that both synchronous passive visuotactile stimulation and synchronous active self-touch induced illusory ownership over a virtual body, without significant differences in their magnitudes. However, the FBI induced by active self-touch was associated with a larger drift in self-location towards the virtual body. These results show that movement-related signals arising from self-touch impact the BSC not only for hand ownership but also for torso-centered body ownership and related aspects of BSC. Index Terms-Full body illusion, sense of body ownership, sense of agency, active self-touch, cognetics.

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A novel manipulation method of human body ownership using an fMRI-compatible master–slave system

Cited by 22 publications

References 48 publications

Voluntary self-touch increases body ownership

Voluntary self-touch increases body ownership

Sensorimotor conflicts induce somatic passivity and louden quiet voices in healthy listeners

Modulation of Bodily Self-Consciousness by Self and External Touch

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