Tosi Giorgia, Kalckert Andreas, Sivasubramanian Anantha Krishna, Romano Daniele
Department of Psychology, University of Milano-Bicocca, Milano, Italy.
Department of Cognitive Neuroscience and Philosophy, University of Skövde, 54128, Skövde, Sweden.
Atten Percept Psychophys. 2024 Nov;86(8):2866-2876. doi: 10.3758/s13414-024-02964-w. Epub 2024 Sep 30.
The rubber hand illusion is a well-known experiment that allows manipulation of one's own body experience. The original questionnaire gauges both the illusion experience and unforeseen experiences acting as control statements. In particular, two statements pertain to the referral of touch originating from the rubber hand (RoT), and one concerns the feeling of ownership of the rubber hand (SoO). Despite its prominence, the rubber hand illusion questionnaire has not undergone thorough examination of its psychometric properties. The literature reveals a tendency to use RoT and SoO statements interchangeably. In this study, we employed Exploratory Graph Analysis to explore the item structure and compared the correlation between SoO and RoT items in various conditions. While SoO and RoT are closely linked, our findings suggest potential separation. SoO and RoT statements consistently correlate, yet hints emerge that RoT might represent a distinct facet of the illusion. Correlations diminish beyond the perihand space, indicating a nuanced relationship. Additionally, moderate relationships between control statements and those measuring the illusion suggest that even control statements are modulated by the illusion experience. This study underscores the need for further exploration into the psychometric properties of body illusion questionnaires, prompting reflections on the interpretation in light of these results.
橡胶手错觉是一个著名的实验，它能够操控个体自身的身体体验。原始问卷既测量错觉体验，也测量作为对照陈述的意外体验。具体而言，有两条陈述涉及源自橡胶手的触觉转移（RoT），还有一条涉及橡胶手的所有权感觉（SoO）。尽管橡胶手错觉问卷很突出，但尚未对其心理测量特性进行全面检验。文献显示存在将RoT和SoO陈述互换使用的倾向。在本研究中，我们采用探索性图分析来探究项目结构，并比较了不同条件下SoO和RoT项目之间的相关性。虽然SoO和RoT紧密相连，但我们的研究结果表明它们可能存在分离。SoO和RoT陈述始终相关，但有迹象表明RoT可能代表错觉的一个独特方面。在手部周围空间之外，相关性减弱，这表明存在细微差别关系。此外，对照陈述与测量错觉的陈述之间存在适度关系，这表明即使是对照陈述也会受到错觉体验的调节。本研究强调需要进一步探索身体错觉问卷的心理测量特性，并促使根据这些结果对解释进行反思。
