Abstract
Body image perception comprises stable and dynamic representational features. Here, we examined whether a stable body image (BI) measure correlates to a dynamic sense of agency (SoA) score. Moreover, we tested whether differential BI perception scores predicts SoA performance under sensory conflict conditions. A total of 21 university students (age M=25.9, SD=9.29) completed the Brazilian version of the Silhouette Figures Scale (SFS) and participated in The Alien Hand Experiment (TAHE). TAHE is a task that manipulates participants’ hand movement SoA. A Bayesian correlation matrix revealed substantial negative correlation probability between BI perception and SoA confidence in accuracy responses, specifically in experimental conditions where agency was manipulated. Based on the SFS scores, participants were divided into groups with and without evidences of BI distortion. Bayesian Independent Samples T-Tests evidenced substantial differential probability between groups. Analyzes confirmed lower SoA confidence among subjects with BI distortion greater than ±3 kg/m².
Highlights
The visual analysis of body shape has been emphasized in recent literature on attentional bias towards biological motion and joint action perception (Klüver, Hecht, & Troje, 2016; Meagher & Marsh, 2014)
sense of agency (SoA) confidence was affected for this group during the conditions under experimental manipulation
Our results are consistent with the work of Daprati et al (1997) who found in a similar group of non-clinical respondents consciousness of alien agency beginning at 15° drawing deviations from the pre-printed target in The Alien Hand Experiment (TAHE)
Summary
The visual analysis of body shape has been emphasized in recent literature on attentional bias towards biological motion and joint action perception (Klüver, Hecht, & Troje, 2016; Meagher & Marsh, 2014). Research on the association between stable body shape perception and self-generated movement has not progressed at the same rate as the former. With the advance of technology, new models of body perception representation have emerged in actionperception research, including movement perception as a new feature in the scope of body image judgment (Mahlo & Tiggemann, 2016)
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