Crossed hands strengthen and diversify proprioceptive drift in the self-touch illusion
In the self-touch illusion (STI), some can feel that both hands are touching each other even when they are separated actually. This is achieved by giving synchronized touches to both hands. Because the STI involves both hands (an administrating hand and a receptive hand) of a single person, two type...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2014-06-01
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| Series: | Frontiers in Human Neuroscience |
| Subjects: | |
| Online Access: | http://journal.frontiersin.org/Journal/10.3389/fnhum.2014.00422/full |
| _version_ | 1828397619739623424 |
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| author | Kenri eKodaka Yuki eIshihara |
| author_facet | Kenri eKodaka Yuki eIshihara |
| author_sort | Kenri eKodaka |
| collection | DOAJ |
| description | In the self-touch illusion (STI), some can feel that both hands are touching each other even when they are separated actually. This is achieved by giving synchronized touches to both hands. Because the STI involves both hands (an administrating hand and a receptive hand) of a single person, two types of proprioceptive drifts (PDs) simultaneously occur in such a way that both hands are attracted to each other. It is known that the PD distance is generally larger for the administrating hand than for the receptive hand when the two hands are uncrossed. However, it remains unclear why such an asymmetrical relationship is observed universally. In this study, we conducted two types of experiment to induce the STI. The first experiment involved four conditions combining a factor of whether the hands are uncrossed or crossed and a factor of whether the administrating hand is resting or active on the surface, with the receptive (left) hand located at the body's midline. The result demonstrated that crossing hands and resting on surface (ROS) induced the STI. Specifically, crossing hands enhanced the amount of PD distance by more than 2 or 3 times. Moreover, it is interesting that strong PD with dominance of the receptive hand, which did not appear in the uncrossed condition, was observed frequently. The second experiment collected seven illusion-sensitive subjects from the first experiment, all of whom had a strong tendency to feel the self-touch, and examined the effect of the location of the body midline on the PD when hands are crossed with the administrating hand ROS. The result demonstrated that the dominant hand on the PD completely differed among subjects, but was relatively stable over the midline position and time in the same person. We also found that a small number of subjects exhibited quite a different pattern of the PD in the identical posture. On the basis of the results, we analyze in detail how the dominant hand on the PD is determined in the STI. |
| first_indexed | 2024-12-10T08:50:58Z |
| format | Article |
| id | doaj.art-c1d25312538a4695924ba3f229f48490 |
| institution | Directory Open Access Journal |
| issn | 1662-5161 |
| language | English |
| last_indexed | 2024-12-10T08:50:58Z |
| publishDate | 2014-06-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Human Neuroscience |
| spelling | doaj.art-c1d25312538a4695924ba3f229f484902022-12-22T01:55:36ZengFrontiers Media S.A.Frontiers in Human Neuroscience1662-51612014-06-01810.3389/fnhum.2014.0042293503Crossed hands strengthen and diversify proprioceptive drift in the self-touch illusionKenri eKodaka0Yuki eIshihara1Nagoya City UniversityNagoya City UniversityIn the self-touch illusion (STI), some can feel that both hands are touching each other even when they are separated actually. This is achieved by giving synchronized touches to both hands. Because the STI involves both hands (an administrating hand and a receptive hand) of a single person, two types of proprioceptive drifts (PDs) simultaneously occur in such a way that both hands are attracted to each other. It is known that the PD distance is generally larger for the administrating hand than for the receptive hand when the two hands are uncrossed. However, it remains unclear why such an asymmetrical relationship is observed universally. In this study, we conducted two types of experiment to induce the STI. The first experiment involved four conditions combining a factor of whether the hands are uncrossed or crossed and a factor of whether the administrating hand is resting or active on the surface, with the receptive (left) hand located at the body's midline. The result demonstrated that crossing hands and resting on surface (ROS) induced the STI. Specifically, crossing hands enhanced the amount of PD distance by more than 2 or 3 times. Moreover, it is interesting that strong PD with dominance of the receptive hand, which did not appear in the uncrossed condition, was observed frequently. The second experiment collected seven illusion-sensitive subjects from the first experiment, all of whom had a strong tendency to feel the self-touch, and examined the effect of the location of the body midline on the PD when hands are crossed with the administrating hand ROS. The result demonstrated that the dominant hand on the PD completely differed among subjects, but was relatively stable over the midline position and time in the same person. We also found that a small number of subjects exhibited quite a different pattern of the PD in the identical posture. On the basis of the results, we analyze in detail how the dominant hand on the PD is determined in the STI.http://journal.frontiersin.org/Journal/10.3389/fnhum.2014.00422/fullbody imagemulti-sensory integrationProprioceptive driftCognitive Dissonanceself-touch illusion |
| spellingShingle | Kenri eKodaka Yuki eIshihara Crossed hands strengthen and diversify proprioceptive drift in the self-touch illusion Frontiers in Human Neuroscience body image multi-sensory integration Proprioceptive drift Cognitive Dissonance self-touch illusion |
| title | Crossed hands strengthen and diversify proprioceptive drift in the self-touch illusion |
| title_full | Crossed hands strengthen and diversify proprioceptive drift in the self-touch illusion |
| title_fullStr | Crossed hands strengthen and diversify proprioceptive drift in the self-touch illusion |
| title_full_unstemmed | Crossed hands strengthen and diversify proprioceptive drift in the self-touch illusion |
| title_short | Crossed hands strengthen and diversify proprioceptive drift in the self-touch illusion |
| title_sort | crossed hands strengthen and diversify proprioceptive drift in the self touch illusion |
| topic | body image multi-sensory integration Proprioceptive drift Cognitive Dissonance self-touch illusion |
| url | http://journal.frontiersin.org/Journal/10.3389/fnhum.2014.00422/full |
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