Peripersonal Space Representation in Upper Limb Segmental Exclusion

Condition(s) studied

Investigational drug(s) / intervention(s)

Reachability Judgment Task in VR.: Participants wear an Oculus Quest 2 VR headset. They first perform a motor task to measure Real Reachable Distance (DMA-r). Then, they perform a perceptual task where they must judge, without moving, if a virtual object is reachable (DMA-p). The test evaluates different spatial planes (front, 45° right, 45° left) and heights (shoulder, navel).

Study summary

This study aims to evaluate the representation of action peripersonal space (PPS) in subjects suffering from unilateral segmental exclusion syndrome of the upper limb compared to healthy control subjects. Segmental exclusion is defined by non-use or under-use of a limb segment without central nervous system damage. The study hypothesizes that this syndrome leads to a modification (shrinkage) of the PPS representation. Participants will perform reachability judgments in a Virtual Reality (VR) environment.

Eligibility

Primary outcome measure(s)

• Judgment Error of Reachability — Day 1 (During the 40-minute VR assessment)
  The Judgment Error of Reachability is a single composite metric calculated as: ((DMA-p - DMA-r) / DMA-r) × 100, expressed as a percentage (%). Both DMA-p (Perceived Maximum Reachable Distance) and DMA-r (Real Maximum Reachable Distance) are measured in centimeters, and their ratio yields a single dimensionless percentage score.

Trial sites (1)

More Union de Gestion des Etablissements des Caisses d'Assurance Maladie - Nord Est trials in France

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