Reader Arran T, Trifonova Victoria S, Ehrsson H Henrik
Department of Psychology, Faculty of Natural Sciences, University of Stirling, Stirling, United Kingdom.
Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.
Front Psychol. 2021 Feb 11;12:629590. doi: 10.3389/fpsyg.2021.629590. eCollection 2021.
The rubber hand illusion (RHI) is one of the most commonly used paradigms to examine the sense of body ownership. Touches are synchronously applied to the real hand, hidden from view, and a false hand in an anatomically congruent position. During the illusion one may perceive that the feeling of touch arises from the false hand (referral of touch), and that the false hand is one's own. The relationship between referral of touch and body ownership in the illusion is unclear, and some articles average responses to statements addressing these experiences, which may be inappropriate depending on the research question of interest. To address these concerns, we re-analyzed three freely available datasets to better understand the relationship between referral of touch and feeling of ownership in the RHI. We found that most participants who report a feeling of ownership also report referral of touch, and that referral of touch and ownership show a moderately strong positive relationship that was highly replicable. In addition, referral of touch tends to be reported more strongly and more frequently than the feeling of ownership over the hand. The former observations confirm that referral of touch and ownership are related experiences in the RHI. The latter, however, indicate that when pooling the statements one may obtain a higher number of illusion 'responders' compared to considering the ownership statements in isolation. These results have implications for the RHI as an experimental paradigm.
橡皮手错觉（RHI）是用于检验身体所有权感的最常用范式之一。触摸会同步施加于隐藏起来不让人看见的真实手部以及处于解剖学对应位置的假手上。在错觉过程中，人们可能会感觉到触摸感来自假手（触摸转移），并且会觉得假手是自己的。错觉中触摸转移与身体所有权之间的关系尚不清楚，而且一些文章将针对这些体验的陈述的回答进行平均，根据感兴趣的研究问题，这可能并不合适。为了解决这些问题，我们重新分析了三个可免费获取的数据集，以更好地理解橡皮手错觉中触摸转移与所有权感之间的关系。我们发现，大多数报告有所有权感的参与者也报告有触摸转移，并且触摸转移与所有权呈现出中度较强的正相关关系，且这种关系具有高度可重复性。此外，相比于对手部的所有权感，触摸转移往往被更强烈、更频繁地报告。前一个观察结果证实了触摸转移和所有权是橡皮手错觉中的相关体验。然而，后一个观察结果表明，与单独考虑所有权陈述相比，汇总陈述时可能会得到更多的错觉“应答者”。这些结果对作为一种实验范式的橡皮手错觉具有启示意义。
