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Visual delay affects force scaling and weight perception during object lifting in virtual reality.

Vonne van Polanen1, Robert Tibold2, Atsuo Nuruki2,3

  • 1Department of Movement Sciences and Leuven Brain Institute, KU Leuven , Leuven , Belgium.

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Summary

This study reveals how the brain integrates visual and haptic feedback during object lifting. Delayed visual cues make objects seem heavier, showing vision

Keywords:
forcegraspingmultisensoryvirtual realityweight perception

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Area of Science:

  • Neuroscience
  • Human-Computer Interaction
  • Robotics

Background:

  • Dexterous actions like lifting objects rely on precise force control.
  • Multisensory integration of tactile and visual information is crucial for refining motor commands during object interaction.
  • The brain mechanisms for integrating sensory information at transient events during actions are not fully understood.

Purpose of the Study:

  • To investigate the relative weighting of haptic and visual signals in motor control during object lifting.
  • To understand how the brain integrates visuo-haptic information at discrete sensorimotor events.
  • To determine the online processing of multisensory signals for action and perception control.

Main Methods:

  • Utilized a virtual reality setup with force-feedback robots to simulate virtual objects.
  • Desynchronized visual feedback from haptic feedback to probe sensory contributions.
  • Developed computational models to quantify the influence of visual feedback on motor output.

Main Results:

  • Visual delays altered fingertip force profiles during object lifting.
  • Participants perceived objects as heavier when visual feedback was delayed.
  • Quantified the specific weighting the brain assigns to haptic versus visual sensory input.

Conclusions:

  • Visuo-haptic integration at discrete sensorimotor events is key for controlling object-lifting dynamics.
  • The brain dynamically weights visual and haptic information for real-time action control.
  • Findings elucidate the online organization of multisensory signals in guiding movement and perception.