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Short-term upper-limb immobilization alters peripersonal space representation

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Abstract

Peripersonal space is a multisensory interface between the environment and the body subserving motor interactions with the physical and social world. Although changing body properties has been shown to alter the functional processing of space, little is known about the effect of short-term limb immobilization specifically on the motor representation of peripersonal space. In the present study, we investigated the effect of a right upper-limb immobilization for a duration of 24 h on a reachability judgment task and a brightness judgment task. Analyses of perceptual thresholds revealed a reduction of peripersonal space representation after the immobilization period, which was not observed when there was no immobilization (control group). In contrast, no variation appeared in the brightness judgment task, suggesting no presence of specific visual perception or decisional deficits in the limb immobilization group. Considered together, the results confirm the crucial role of the motor system in the representation of peripersonal space. They also highlight the plasticity of the motor system resulting in a rapid change of its activity following limb immobilization, with a concomitant effect on motor-related perceptual and cognitive processes.

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Correspondence to Lucette Toussaint.

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The study has been approved by the ethics committee for research in science of physical and sports activities and has, therefore, been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.

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All participants gave their informed consent prior to their inclusion in the study. Details that might disclose the identity of the participants have been omitted.

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The authors declare that no conflict of interest exists. Moreover, they have full control of all primary data and they agree to allow the journal to review their data if requested.

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Toussaint, L., Wamain, Y., Bidet-Ildei, C. et al. Short-term upper-limb immobilization alters peripersonal space representation. Psychological Research 84, 907–914 (2020). https://doi.org/10.1007/s00426-018-1118-0

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  • DOI: https://doi.org/10.1007/s00426-018-1118-0

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