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"XR Mark Test" Reveals Sensorimotor Body Representation in Toddlers

Miyazaki, M.; Asai, T.; Ban, N.; Mugitani, R.

2021-10-09 animal behavior and cognition
10.1101/2021.10.08.462966 bioRxiv
Show abstract

Despite its popularity as an index of self-recognition, the mark test has not been used for assessing representations of the bodily self. This study combines the mark test and cross-reality task, to demonstrate novel aspects of childrens body representation and its development. Participants real-time skeletal data was captured, and virtual marks were displayed on 30 body parts for participants to interact through touch. The accuracy and trajectory of the first touch and reaction time were analyzed. Thirty Japanese 2- and 3-year-olds participated. Localization error could be predicted by dynamical body part coordination. Three-year-olds displayed fast and predictive reaching instead of visually guided reaching. Analyzing hand-reaching strategies in the XR mark test revealed aspects of the development of sensorimotor body representations.

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