PubMed · 13345157
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B BARR, H KOCH. 1956-06-15. [Functional hearing disorders].. https://pubmed.ncbi.nlm.nih.gov/13345157/
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Subjects perceived touch sensations as arising from a table (or a rubber hand) when both the table (or the rubber hand) and their own real hand were repeatedly tapped and stroked in synchrony with the real hand hidden from view. If the table or rubber hand was then 'injured', subjects displayed a strong skin conductance response (SCR) even though nothing was done to the real hand. Sensations could even be projected to anatomically impossible locations. The illusion was much less vivid, as indicated by subjective reports and SCR, if the real hand was simultaneously visible during stroking, or if the real hand was hidden but touched asynchronously. The fact that the illusion could be significantly diminished when the real hand was simultaneously visible suggests that the illusion and associated SCRs were due to perceptual assimilation of the table (or rubber hand) into one's body image rather than associative conditioning. These experiments demonstrate the malleability of body image and the brain's remarkable capacity for detecting statistical correlations in the sensory input.
We built a low-cost system for monitoring human skin conductance responses (SCRs) in a clinical magnetic resonance (MR) scanner during functional imaging. The average scanner-induced conductance noise level was suppressed sufficiently to allow SCR measurements over the full range of SCR amplitudes, and functional image signal-to-noise ratio was unaffected by the skin conductance apparatus. The system may be useful for a variety of imaging studies.
Because DC electrodermal potential measurements do not involve introducing a current into the body, it was postulated that temporal fluctuations in DC potential values on acupoints would be a useful method for assessing the subtle energetic changes of qi. DC potential measurements from acupoints and nonacupoints were therefore compared when energy healing practitioners were in an external focus state, were healing at a distance (external qi), or were self-healing (internal qi). The results show statistically significant differences between measurements obtained on and off acupoints and between external focus and healing states. Subjects' report of felt sense of the flow of qi moving in their body also correlated with DC potential readings, but only those readings taken on acupoints. The results support the hypothesis that pattern information from temporal fluctuations in DC potential electrodermal measurements reflects the movement and/or amount of a physical, electrical activity that corresponds to the traditional Eastern concept of qi circulating in the body.