The Experimental Induction of Out-of-Body Experiences

The Experimental Induction of Out-of-Body Experiences

24 August 2007 | H. Henrik Ehrsson
H. Henrik Ehrsson's study demonstrates that out-of-body experiences (OBEs) can be induced in healthy individuals through a perceptual illusion. Participants experience their self as located outside their physical bodies, seeing their bodies from another person's perspective. This illusion is created by combining first-person visual perspective with synchronized visual and tactile stimulation on the body. Participants reported feeling as if they were sitting behind their physical bodies and looking at them from that location. In the experiment, participants wore head-mounted displays and were touched on their chest by a researcher using two plastic rods. The researcher touched both the real chest and an illusory chest (seen by the participant as being behind them). Participants completed a questionnaire to assess their experience of the illusion. The results showed significant differences in ratings between the illusion and control conditions, indicating that participants experienced the illusion. Skin-conductance responses (SCRs) were measured to assess emotional responses to the illusion. Participants showed greater SCR responses when the illusory body was "hurt" compared to when the real body was touched. This suggests that participants were emotionally responding as if they were located behind their physical bodies. The study shows that the sense of being located within the physical body is determined by perceptual processes, specifically by the visual perspective and multisensory stimulation. The findings suggest that the natural "in-body experience" forms the foundation for self-consciousness. The study also highlights the importance of multisensory correlations in near-personal space for self-attribution of body parts and body ownership. The results provide objective evidence that the participants were emotionally responding as if they were located behind their physical bodies. The study has implications for understanding the neural mechanisms underlying OBEs and self-consciousness.H. Henrik Ehrsson's study demonstrates that out-of-body experiences (OBEs) can be induced in healthy individuals through a perceptual illusion. Participants experience their self as located outside their physical bodies, seeing their bodies from another person's perspective. This illusion is created by combining first-person visual perspective with synchronized visual and tactile stimulation on the body. Participants reported feeling as if they were sitting behind their physical bodies and looking at them from that location. In the experiment, participants wore head-mounted displays and were touched on their chest by a researcher using two plastic rods. The researcher touched both the real chest and an illusory chest (seen by the participant as being behind them). Participants completed a questionnaire to assess their experience of the illusion. The results showed significant differences in ratings between the illusion and control conditions, indicating that participants experienced the illusion. Skin-conductance responses (SCRs) were measured to assess emotional responses to the illusion. Participants showed greater SCR responses when the illusory body was "hurt" compared to when the real body was touched. This suggests that participants were emotionally responding as if they were located behind their physical bodies. The study shows that the sense of being located within the physical body is determined by perceptual processes, specifically by the visual perspective and multisensory stimulation. The findings suggest that the natural "in-body experience" forms the foundation for self-consciousness. The study also highlights the importance of multisensory correlations in near-personal space for self-attribution of body parts and body ownership. The results provide objective evidence that the participants were emotionally responding as if they were located behind their physical bodies. The study has implications for understanding the neural mechanisms underlying OBEs and self-consciousness.
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