A methodological study of virtual self-touch: effects on perception and motor control strategies

Area of Science:

• Neuroscience
• Virtual Reality Technology
• Human-Computer Interaction

Background:

• Virtual reality (VR) enables research into body schema plasticity.
• Avatar habituation methods are used to update body schema.
• Virtual self-touch (VST) involves interacting with an avatar as a substitute body with haptic feedback.

Purpose of the Study:

• To investigate if virtual self-touch (VST) is crucial for updating body schema.
• To compare the effectiveness of VST with the existing arm swing task (AST) method.
• To explore the impact of VST on body ownership, agency, and motor planning.

Main Methods:

• An experiment was conducted with 10 participants using VR avatars.
• Participants engaged in VST with avatars featuring an elongated forearm.
• Effectiveness was measured via questionnaires, proprioceptive drift, and reaching tasks, comparing VST to AST.

Main Results:

• VST induced greater proprioceptive drift than AST.
• VST led to more significant changes in fingertip trajectories and reach endpoints, indicating effects on motor planning.
• Distortions in spatial perception were observed when relying solely on somatosensory feedback.

Conclusions:

• VST effectively contributes to updating the body schema.
• VST influences motor planning and spatial perception.
• The findings provide insights into the representation of spatial perception within the body schema.