Embodiment of others’ hands elicits arousal responses similar to one’s own hands

Garbarini, Francesca; Fornia, Luca; Fossataro, Carlotta; Pia, Lorenzo; Gindri, Patrizia; Berti, Anna

doi:10.1016/j.cub.2014.07.023

Cited by 49 publications

(57 citation statements)

References 10 publications

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“…These patients never attribute to themselves more than one arm per side and they typically select the one closer to the midline on the cotrolesional side, and one's own on the healthy side. Critically to our hypothesis E+ patients have equally strong SCR when a needle approach their healthy limb or the embodied alien limb, while SCR decrease if alien limb is in a location where it cannot be incorporated (Garbarini, et al, 2014a).…”

Section: Discussionmentioning

confidence: 79%

“…Indeed it has been show that experiencing a sense of ownership toward an alien hand is related to the emotional reaction when that hand is threatened either in healthy participants under bodily illusions (Armel & Ramachandran 2003;Ehrsson, et al, 2007), and in patients experiencing pathological embodiment for alien hands (Garbarini, Fornia, Fossataro, Pia, Gindri, & Berti, 2014a). Early research in anosognosia, the nonrecognition of one's own illness, revealed a basic disturbance in the "circuits for danger recognition" suggesting that being aware of one's own body is a critical function for adaptive behaviour (Vocat & Vuilleumier, 2010).…”

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confidence: 99%

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Body ownership: When feeling and knowing diverge

Romano

Sedda

Brugger

et al. 2015

Consciousness and Cognition

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Individuals with the peculiar disturbance of 'overcompleteness' experience an intense desire to amputate one of their healthy limbs, describing a sense of disownership for it (Body Integrity Identity Disorder -BIID). This condition is similar to somatoparaphrenia, the acquired delusion that one's own limb belongs to someone else. In ten individuals with BIID, we measured skin conductance response to noxious stimuli, delivered to the accepted and non-accepted limb, touching the body part or simulating the contact (stimuli approach the body without contacting it), hypothesizing that these individuals have responses like somatoparaphrenic patients, who previously showed reduced pain anticipation, when the threat was directed to the disowned limb. We found reduced anticipatory response to stimuli approaching, but not contacting, the unwanted limb. Conversely, stimuli contacting the non-accepted body-part, induced stronger SCR than those contacting the healthy parts, suggesting that feeling of ownership is critically related to a proper processing of incoming threats. AbstractPersons with peculiar disturbance of 'overcompleteness' experience an intense desire to amputate

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Section: Discussionmentioning

confidence: 79%

mentioning

confidence: 99%

Body ownership: When feeling and knowing diverge

Romano

Sedda

Brugger

et al. 2015

Consciousness and Cognition

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“…It is interesting to note that, according to specific constraints similar to those operating in the RHI, the pathological embodiment occurs only when the alien hand is perceived in egocentric coordinates and it is aligned with the patients’ contralesional shoulder, in a coherent position with respect to the patients’ body schema (i.e., our unconscious and dynamic body representation9). If the alien hand is presented in different positions or in the intact body-side, the pathological embodiment does not occur and patients correctly discriminate the own from the alien hand1011121314 (see also a video at http://youtu.be/uKTwAybB758). This evidence suggest that, in both RHI and E+ patients, in order for the embodiment to occur, bottom-up multisensory integration processes1516 are not sufficient, but, instead, top-down preexisting body representations, containing information about what can be potentially included in my own body according to specific constraints, are necessary1718.…”

mentioning

confidence: 99%

Bodily ownership modulation in defensive responses: physiological evidence in brain-damaged patients with pathological embodiment of other’s body parts

Fossataro

Gindri

Mezzanato³

et al. 2016

Sci Rep

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Do conscious beliefs about the body affect defensive mechanisms within the body? To answer this question we took advantage from a monothematic delusion of bodily ownership, in which brain-damaged patients misidentify alien limbs as their own. We investigated whether the delusional belief that an alien hand is their own hand modulates a subcortical defensive response, such as the hand-blink reflex. The blink, dramatically increases when the threated hand is inside the defensive peripersonal-space of the face. In our between-subjects design, including patients and controls, the threat was brought near the face either by the own hand or by another person’s hand. Our results show an ownership-dependent modulation of the defensive response. In controls, as well as in the patients’ intact-side, the response enhancement is significantly greater when the threat was brought near the face by the own than by the alien hand. Crucially, in the patients’ affected-side (where the pathological embodiment occurs), the alien (embodied) hand elicited a response enhancement comparable to that found when the threat is brought near the face by the real hand. These findings suggest the existence of a mutual interaction between our conscious beliefs about the body and the physiological mechanisms within the body.

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“…The possibility that an opposite behavior exists, that is, patients who misidentify other people's limbs as if they were their own, has been rarely considered. However, in recent studies Garbarini et al, 2013b;Garbarini, Fornia, et al, 2014;Garbarini, Fossataro, et al, 2015;Pia et al, 2013a), we observed this behavior in a sample of hemiplegic and/or hemianesthesic patients. While they did not explicitly deny that their contralesional (left) limbs belonged to themselves (as in the somatoparaphrenic delusion of disownership), they claimed that the examiner's left hand was their own whenever it was positioned, in egocentric coordinates, on the table next to their real left hand.…”

Section: Body Awareness Deficits and Their Relation With Agency And Imentioning

confidence: 81%

“…We investigated the somatosensory domain (Pia et al, 2013a;Garbarini et al, 2014), reasoning that the pathological embodiment observed in E+ patients is an ideal condition to examine whether tactile/pain sensations can be "transferred" to an alien arm subjectively experienced as own. Patients (with and without the delusion) and healthy controls were tested with a pinprick protocol to assess pain perception.…”

Section: Body Awareness Deficits and Their Relation With Agency And Imentioning

confidence: 99%