Perception-extra-body-parts-amp; body-part-weight

Date: 22 November 2023

Speaker: Denise Cadete, PhD student at the Body Representation Lab, Birkbeck University of London
Title: Perception of extra body parts & body part weight

Abstract: In everyday life, we have a constant and reliable experience of our own bodies. However, the perception of our body can be instantly altered using multisensory illusions or Virtual Reality. This flexibility is not restricted to the human body configuration, with recent studies showing we can also feel extra body parts. In the first part of the presentation, I will present the six finger illusion and what our findings tell us about how supernumerary body parts are represented in the brain. We will make a case for the independence and flexibility of how we represent extra body parts, also aiming to determine what are its limits.
In the second part, I will introduce our studies looking into how we perceive the weight of body parts. Perception of object’s weight has been studied for over a century, however little is known about weight perception of body parts. A recent study of our lab showed that we systematically and dramatically underestimate hand weight by 49% (Ferrè et al., 2023), an effect we called weightedness, for how light we experience body parts, on Earth. We further investigated how perceived hand size changed felt hand weight, and in another study we looked at perceived hand volume. We will propose a model of constant density in the perception of body part weight.