Abstract
Interaction with objects in the environment typically requires integrating information concerning the object location with the position and size of body parts. The former information is coded in a multisensory representation of the space around the body, a representation of peripersonal space (PPS), whereas the latter is enabled by an online, constantly updated, action-orientated multisensory representation of the body (BR). Using a tool to act upon relatively distant objects extends PPS representation. This effect has been interpreted as indicating that tools can be incorporated into BR. However, empirical data showing that tool-use simultaneously affects PPS representation and BR are lacking. To study this issue, we assessed the extent of PPS representation by means of an audio-tactile interaction task and BR by means of a tactile distance perception task and a body-landmarks localisation task, before and after using a 1-m-long tool to reach far objects. Tool-use extended the representation of PPS along the tool axis and concurrently shaped BR; after tool-use, subjects perceived their forearm narrower and longer compared to before tool-use, a shape more similar to the one of the tool. Tool-use was necessary to induce these effects, since a pointing task did not affect PPS and BR. These results show that a brief training with a tool induces plastic changes both to the perceived dimensions of the body part acting upon the tool and to the space around it, suggesting a strong overlap between peripersonal space and body representation.
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Acknowledgments
This work was supported by a Volkswagen Stiftung grant (the_unboundbody_project, ref. 85 639) to AS. The authors thank Patrick Haggard and Nicola Bruno for useful comments on data analysis and interpretation, Valentina Tedeschi and Marilena Marzolla for her help in data collection, Laura Taverna (Robotics, Brain and Cognitive Sciences, Istituto Italiano di Tecnologia) for photos of the experimental procedure and Adrian T. Smith for proof-reading and comments.
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Canzoneri, E., Ubaldi, S., Rastelli, V. et al. Tool-use reshapes the boundaries of body and peripersonal space representations. Exp Brain Res 228, 25–42 (2013). https://doi.org/10.1007/s00221-013-3532-2
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DOI: https://doi.org/10.1007/s00221-013-3532-2