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Visual delay affects force scaling and weight perception when lifting objects in virtual reality

Vonne van Polanen, Robert Tibold, Marco Davare
doi: https://doi.org/10.1101/504563
Vonne van Polanen
1Movement Control and Neuroplasticity Research Group, Biomedical Sciences, KU Leuven, Leuven 3001, Belgium
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Robert Tibold
2Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, University College London, London WCIN3BG, UK
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Marco Davare
1Movement Control and Neuroplasticity Research Group, Biomedical Sciences, KU Leuven, Leuven 3001, Belgium
2Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, University College London, London WCIN3BG, UK
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Abstract

Lifting an object requires precise scaling of fingertip forces based on a prediction of object weight. At object contact, a series of tactile and visual events arise that need to be rapidly processed online to fine-tune the planned motor commands for lifting the object. The brain mechanisms underlying multisensory integration serially at transient sensorimotor events, a general feature of actions requiring hand-object interactions, are not yet understood. Here we tested the relative weighting between haptic and visual signals when they are integrated online into the motor command. We used a new virtual reality setup to desynchronize visual feedback from haptics, which allowed us to probe the relative contribution of haptics and vision in driving participants’ movements when they grasped virtual objects simulated by two force-feedback robots. We found that visual delay changed the profile of fingertip force generation and led participants to perceive objects as heavier than when lifts were performed without visual delay. We further modeled the effect of vision on motor output by manipulating the extent to which delayed visual events could bias the force profile, which allowed us to determine the specific weighting the brain assigns to haptics and vision. Our results show for the first time how visuo-haptic integration is processed at discrete sensorimotor events for controlling object lifting dynamics and further highlight the organization of multisensory signals online for controlling action and perception.

New & Noteworthy Dexterous hand movements require rapid integration of information from different senses, in particular touch and vision, at different key time points as movement unfolds. The relative weighting of vision and haptics for object manipulation is unknown. We used object lifting in virtual reality to desynchronize visual and haptic feedback and find out their relative weightings. Our findings shed light on how rapid multisensory integration is processed over a series of discrete sensorimotor control points.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted December 21, 2018.
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Visual delay affects force scaling and weight perception when lifting objects in virtual reality
Vonne van Polanen, Robert Tibold, Marco Davare
bioRxiv 504563; doi: https://doi.org/10.1101/504563
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Visual delay affects force scaling and weight perception when lifting objects in virtual reality
Vonne van Polanen, Robert Tibold, Marco Davare
bioRxiv 504563; doi: https://doi.org/10.1101/504563

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