Effects of Symmetry and Apparent Distance in a Parasagittal-Mirror Variant of the Rubber Hand Illusion Paradigm
When I see my face in a mirror, its apparent position (behind the glass) is not one that my own face could be in. I accept the face I see as my own because I have an implicit understanding of how mirrors work. The situation is different if I look at the reflection of my right hand in a parasagittal...
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| Format: | Article |
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Frontiers Media S.A.
2021-09-01
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| Series: | Frontiers in Human Neuroscience |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fnhum.2021.718177/full |
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| author | Jhana de Silva Haiwen Chen Sasha Isaac Rebekah C. White Martin Davies Martin Davies Anne M. Aimola Davies |
| author_facet | Jhana de Silva Haiwen Chen Sasha Isaac Rebekah C. White Martin Davies Martin Davies Anne M. Aimola Davies |
| author_sort | Jhana de Silva |
| collection | DOAJ |
| description | When I see my face in a mirror, its apparent position (behind the glass) is not one that my own face could be in. I accept the face I see as my own because I have an implicit understanding of how mirrors work. The situation is different if I look at the reflection of my right hand in a parasagittal mirror (parallel to body midline) when my left hand is hidden behind the mirror. It is as if I were looking through a window at my own left hand. The experience of body ownership has been investigated using rubber hand illusion (RHI) paradigms, and several studies have demonstrated ownership of a rubber hand viewed in a frontal mirror. Our “proof of concept” study was the first to combine use of a parasagittal mirror and synchronous stroking of both a prosthetic hand (viewed in the mirror) and the participant’s hand, with a manipulation of distance between the hands. The strength of the RHI elicited by our parasagittal-mirror paradigm depended not on physical distance between the hands (30, 45, or 60 cm) but on apparent distance between the prosthetic hand (viewed in the mirror) and the participant’s hand. This apparent distance was reduced to zero when the prosthetic hand and participant’s hand were arranged symmetrically (e.g., 30 cm in front of and behind the mirror). Thus, the parasagittal-mirror paradigm may provide a distinctive way to assess whether competition for ownership depends on spatial separation between the prosthetic hand and the participant’s hand. |
| first_indexed | 2024-12-16T23:30:11Z |
| format | Article |
| id | doaj.art-66efbac5db644d128a700a7733c1ea85 |
| institution | Directory Open Access Journal |
| issn | 1662-5161 |
| language | English |
| last_indexed | 2024-12-16T23:30:11Z |
| publishDate | 2021-09-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Human Neuroscience |
| spelling | doaj.art-66efbac5db644d128a700a7733c1ea852022-12-21T22:11:54ZengFrontiers Media S.A.Frontiers in Human Neuroscience1662-51612021-09-011510.3389/fnhum.2021.718177718177Effects of Symmetry and Apparent Distance in a Parasagittal-Mirror Variant of the Rubber Hand Illusion ParadigmJhana de Silva0Haiwen Chen1Sasha Isaac2Rebekah C. White3Martin Davies4Martin Davies5Anne M. Aimola Davies6Research School of Psychology, Australian National University, Canberra, ACT, AustraliaResearch School of Psychology, Australian National University, Canberra, ACT, AustraliaResearch School of Psychology, Australian National University, Canberra, ACT, AustraliaDepartment of Experimental Psychology, Medical Sciences Division, University of Oxford, Oxford, United KingdomCorpus Christi College, University of Oxford, Oxford, United KingdomPhilosophy Department, Monash University, Clayton, VIC, AustraliaResearch School of Psychology, Australian National University, Canberra, ACT, AustraliaWhen I see my face in a mirror, its apparent position (behind the glass) is not one that my own face could be in. I accept the face I see as my own because I have an implicit understanding of how mirrors work. The situation is different if I look at the reflection of my right hand in a parasagittal mirror (parallel to body midline) when my left hand is hidden behind the mirror. It is as if I were looking through a window at my own left hand. The experience of body ownership has been investigated using rubber hand illusion (RHI) paradigms, and several studies have demonstrated ownership of a rubber hand viewed in a frontal mirror. Our “proof of concept” study was the first to combine use of a parasagittal mirror and synchronous stroking of both a prosthetic hand (viewed in the mirror) and the participant’s hand, with a manipulation of distance between the hands. The strength of the RHI elicited by our parasagittal-mirror paradigm depended not on physical distance between the hands (30, 45, or 60 cm) but on apparent distance between the prosthetic hand (viewed in the mirror) and the participant’s hand. This apparent distance was reduced to zero when the prosthetic hand and participant’s hand were arranged symmetrically (e.g., 30 cm in front of and behind the mirror). Thus, the parasagittal-mirror paradigm may provide a distinctive way to assess whether competition for ownership depends on spatial separation between the prosthetic hand and the participant’s hand.https://www.frontiersin.org/articles/10.3389/fnhum.2021.718177/fullbody ownershipdistancemirror boxmultisensory integrationparasagittal mirrorperipersonal space |
| spellingShingle | Jhana de Silva Haiwen Chen Sasha Isaac Rebekah C. White Martin Davies Martin Davies Anne M. Aimola Davies Effects of Symmetry and Apparent Distance in a Parasagittal-Mirror Variant of the Rubber Hand Illusion Paradigm Frontiers in Human Neuroscience body ownership distance mirror box multisensory integration parasagittal mirror peripersonal space |
| title | Effects of Symmetry and Apparent Distance in a Parasagittal-Mirror Variant of the Rubber Hand Illusion Paradigm |
| title_full | Effects of Symmetry and Apparent Distance in a Parasagittal-Mirror Variant of the Rubber Hand Illusion Paradigm |
| title_fullStr | Effects of Symmetry and Apparent Distance in a Parasagittal-Mirror Variant of the Rubber Hand Illusion Paradigm |
| title_full_unstemmed | Effects of Symmetry and Apparent Distance in a Parasagittal-Mirror Variant of the Rubber Hand Illusion Paradigm |
| title_short | Effects of Symmetry and Apparent Distance in a Parasagittal-Mirror Variant of the Rubber Hand Illusion Paradigm |
| title_sort | effects of symmetry and apparent distance in a parasagittal mirror variant of the rubber hand illusion paradigm |
| topic | body ownership distance mirror box multisensory integration parasagittal mirror peripersonal space |
| url | https://www.frontiersin.org/articles/10.3389/fnhum.2021.718177/full |
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