de Silva Jhana, Chen Haiwen, Isaac Sasha, White Rebekah C, Davies Martin, Aimola Davies Anne M
Research School of Psychology, Australian National University, Canberra, ACT, Australia.
Department of Experimental Psychology, Medical Sciences Division, University of Oxford, Oxford, United Kingdom.
Front Hum Neurosci. 2021 Sep 16;15:718177. doi: 10.3389/fnhum.2021.718177. eCollection 2021.
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.
当我在镜子中看到自己的脸时，其明显位置（在玻璃后面）并非我自己的脸实际所在的位置。我之所以将看到的脸视为自己的，是因为我对镜子的工作原理有隐性的理解。但如果当我的左手藏在镜子后面时，我在矢状旁面镜（与身体中线平行）中看右手的反射，情况就不同了。那就好像我透过一扇窗户在看自己的左手。身体所有权的体验已通过橡皮手错觉（RHI）范式进行了研究，并且有几项研究表明在正面前置镜中看到的橡皮手具有所有权。我们的“概念验证”研究首次将矢状旁面镜的使用与对假手（在镜子中看到）和参与者的手同时进行抚摸相结合，并对双手之间的距离进行了操控。我们的矢状旁面镜范式引发的橡皮手错觉的强度并不取决于双手之间的实际距离（30、45或60厘米），而是取决于假手（在镜子中看到）与参与者的手之间的视在距离。当假手和参与者的手对称排列时（例如，在镜子前后各30厘米），这种视在距离会减小到零。因此，矢状旁面镜范式可能提供一种独特的方式来评估对所有权的竞争是否取决于假手与参与者的手之间的空间分离。
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