Identifying with the Beautiful: Facial attractiveness effects on unisensory and multisensory self-other distinction

People tend to evaluate their own traits and abilities favourably and such favourable self-perceptions extend to attractiveness. However, the exact mechanism underlying this self-enhancement bias remains unclear and one possibility could be the identification with attractive others through blurring of self-other boundaries. Across two experiments, we used the enfacement illusion to investigate the effect of the attractiveness of others in the multisensory perception of the self. In a first experiment (N=35), participants were stroked on the cheek while looking at an attractive vs. non-attractive face being stroked on the cheek in synchrony or asynchrony. In the second experiment (N=35), two new faces were used and spatial incοngruency was introduced as a control condition. The results showed that increased ratings of attractiveness of an unfamiliar face lead to blurring of self-other boundaries, allowing the identification of our psychological self with another's physical self, and specifically their face, and this seems to be unrelated to perceived own attractiveness. The effect of facial attractiveness on face ownership showed dissociable mechanisms, with multisensory integration modulating the effect on similarity but not identification, an effect that may be purely based on vision. Overall, our findings suggest that others’ attractiveness may lead to positive distortions of the self, identifying with the more rather than less attractive others. This research provides a psychophysical starting point for studying the impact of others' attractiveness on how we perceive the self, which can be particularly important for individuals with malleable, embodied self-other boundaries and body image disturbances