Familiarity with a Tool Influences Peripersonal Space and Primary Motor Cortex Excitability of Muscles Involved in Haptic Contact

Author:

Biggio M1,Bisio A1,Avanzino L12,Ruggeri P1,Bove M12

Affiliation:

1. Department of Experimental Medicine, Section of Human Physiology and Centro Polifunzionale Scienze Motorie, University of Genoa, 16132 Genoa, Italy

2. Ospedale Policlinico San Martino, IRCSS, 16132, Genova, Italy

Abstract

Abstract Long-term experience with a tool stably enlarges peripersonal space (PPS). Also, gained experience with a tool modulates internal models of action. The aim of this work was to understand whether the familiarity with a tool influences both PPS and motor representation. Toward this goal, we tested in 13 expert fencers through a multisensory integration paradigm the embodiment in their PPS of a personal (pE) or a common (cE) épée. Then, we evaluated the primary motor cortex excitability of proximal (ECR) and distal (APB) muscles during a motor imagery (MI) task of an athletic gesture when athletes handled these tools. Results showed that pE enlarges subjects’ PPS, while cE does not. Moreover, during MI, handling tools increased cortical excitability of ECR muscle. Notably, APB’s cortical excitability during MI only increased with pE as a function of its embodiment in PPS. These findings indicate that the familiarity with a tool specifically enlarges PPS and modulates the cortical motor representation of those muscles involved in the haptic contact with it.

Publisher

Oxford University Press (OUP)

Subject

General Medicine

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