Short-term upper-limb immobilization alters peripersonal space representation
Lucette Toussaint1, Yannick Wamain2, Christel Bidet-Ildei3
1Université de Poitiers, Université de Tours, Centre National de la Recherche Scientifique, Centre de Recherches sur la Cognition et l'Apprentissage (CERCA-UMR 7295), 5 rue Théodore Lefebvre, 86000, Poitiers, France. lucette.toussaint@univ-poitiers.fr.
Psychological Research
|November 14, 2018
Summary
Short-term limb immobilization rapidly shrinks the brain's representation of peripersonal space. This study shows the motor system
Area of Science:
- Neuroscience
- Cognitive Science
- Motor Control
Background:
- Peripersonal space (PPS) is a body-centered sensory-motor space crucial for interacting with the environment.
- The impact of short-term limb immobilization on PPS representation remains largely unexplored.
- Understanding PPS plasticity is key to comprehending sensorimotor integration.
Purpose of the Study:
- To investigate the effect of 24-hour right upper-limb immobilization on peripersonal space representation.
- To assess whether immobilization affects motor-related spatial judgments differently from visual perception.
- To explore the role of the motor system in shaping peripersonal space.
Main Methods:
- Participants underwent a 24-hour immobilization of their right upper limb.
- Reachability judgment and brightness judgment tasks were administered pre- and post-immobilization.
- Perceptual thresholds were analyzed to quantify changes in peripersonal space representation.
Main Results:
- A significant reduction in peripersonal space representation was observed after limb immobilization.
- No changes were found in the brightness judgment task, indicating preserved visual perception.
- Control group without immobilization showed no alteration in peripersonal space.
Conclusions:
- The motor system plays a critical role in the online representation of peripersonal space.
- Limb immobilization rapidly induces changes in motor system activity.
- Motor system plasticity directly impacts motor-related perceptual and cognitive functions.
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