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Anodal transcranial direct current stimulation over the posterior parietal cortex reduces the onset time to the rubber hand illusion and increases the body ownership

Experimental Brain Research volume 236, pages 2935–2943 (2018)Cite this article

Abstract

The body ownership induced by the rubber hand illusion (RHI) has been related to a neural network involving a frontal–parietal circuit. Previous functional neuroimaging studies have demonstrated neural activation in the parietal area relative to the multisensory integration processing and to the recalibration of the felt position of body while a ventral premotor cortex activation has been linked to bodily self-attribution during the RHI. Our study aimed to investigate the effects of transcranial direct current stimulation (tDCS) on the posterior parietal cortex (PPC) or on the premotor cortex (PMv) during RHI to address the specific roles of these two brain areas in the illusion. 156 young adult participants (21.2 ± 3.13 years old; all right-handed) were enrolled for this between-subjects design experiment. Participants received anodal, cathodal and sham tDCS in three different sessions on the right PPC or right PMv and experienced visual–tactile stimulation from the brushes touching the rubber hand and their own left hand in synchronous or asynchronous manner. The RHI was quantified by the (1) onset time for the feeling of body ownership of the rubber hand, (2) proprioceptive drift, and (3) questionnaire about the intensity of the illusion as reported by the participant. All subjects felt the RHI during the synchronous condition. However, we found that the illusion onset time can be modulated by the anodal tDCS condition on the PPC: anodal tDCS decreased the illusion onset time and the subjective experience of body ownership. These findings suggest that the parietal area plays a crucial role in the speed of visual and tactile multisensory integration in the RHI and introduce tDCS as technique that can accelerate the time to integrate an artificial body part and increased the perception of body ownership.

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Funding

M.L. was supported by a CAPES grant. P.S.B. is a CNPq research fellow (311641/2015-6). C.G. was supported by a FAPESP Grant (2017/19520-5). This project was supported by Fundo Mackenzie de Pesquisa.

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  1. Social and Cognitive Neuroscience Laboratory and Developmental Disorders Program, Center for Health and Biological Sciences, Mackenzie Presbyterian University, Piaui, 181, 10° andar, São Paulo, 01241-001, Brazil

    Marilia Lira, Fernanda Naomi Pantaleão, Carolina Gudin de Souza Ramos & Paulo S. Boggio

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  1. Marilia Lira
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  2. Fernanda Naomi Pantaleão
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  3. Carolina Gudin de Souza Ramos
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  4. Paulo S. Boggio
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Correspondence to Paulo S. Boggio.

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Lira, M., Pantaleão, F.N., de Souza Ramos, C.G. et al. Anodal transcranial direct current stimulation over the posterior parietal cortex reduces the onset time to the rubber hand illusion and increases the body ownership. Exp Brain Res 236, 2935–2943 (2018). https://doi.org/10.1007/s00221-018-5353-9

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  • DOI: https://doi.org/10.1007/s00221-018-5353-9

Keywords

  • Rubber hand illusion
  • Multisensory integration
  • Body schema
  • Transcranial direct current stimulation