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Modifying Bodily Self-Awareness during Acupuncture Needle Stimulation Using the Rubber Hand Illusion
Dong-Seon Chang1, Yun-Ji Kim, Soon-Ho Lee
1Acupuncture and Meridian Science Research Center, Kyung Hee University, 1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea ; Department of Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Tübingen, Germany.
Visual expectation, not body ownership, significantly influences the sympathetic response to acupuncture needle stimulation. This study explored how the rubber hand illusion affects pain perception and autonomic responses during needling.
Area of Science:
- Neuroscience
- Psychology
- Physiology
Background:
- The rubber hand illusion (RHI) is a key experimental paradigm for studying body self-awareness.
- Understanding how body ownership and visual expectations influence pain perception and autonomic responses is crucial.
Purpose of the Study:
- To investigate the impact of RHI-induced modifications in body ownership and visual expectations on pain perception.
- To assess changes in autonomic responses, specifically skin conductance response (SCR), to acupuncture needle stimulation.
Main Methods:
- Acupuncture needle stimulation was applied to the real hand during RHI, with and without visual expectation (Experiment 1 and 2).
- Skin conductance response (SCR) was measured to assess autonomic changes.
- Subjective perceptions of the RHI and pain were recorded via questionnaires.
Main Results:
- Experiment 1 (with visual expectation) showed a higher SCR increase during synchronous RHI compared to asynchronous.
- Experiment 2 (without visual expectation) demonstrated a lower SCR increase during synchronous RHI compared to asynchronous.
- Visual expectation of needle stimulation amplified the autonomic response to acupuncture.
Conclusions:
- Sympathetic responses to acupuncture are predominantly modulated by visual expectation.
- Modifications in body ownership through RHI appear to have a lesser impact on these autonomic responses compared to visual cues.
