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Sensorimotor Memory for Object Weight is Based on Previous Experience During Lifting, Not Holding

View ORCID ProfileVonne van Polanen, View ORCID ProfileMarco Davare
doi: https://doi.org/10.1101/464693
Vonne van Polanen
Motor Control Laboratory, Movement Control and Neuroplasticity Research Group, Biomedical Sciences Group, Department of Movement Sciences, KU Leuven, Tervuursevest 101, 3001 Heverlee (Leuven), Belgium
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Marco Davare
Motor Control Laboratory, Movement Control and Neuroplasticity Research Group, Biomedical Sciences Group, Department of Movement Sciences, KU Leuven, Tervuursevest 101, 3001 Heverlee (Leuven), Belgium
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ABSTRACT

To allow skilled object manipulation, the brain must generate a motor command specifically tailored to the object properties. For instance, in object lifting, the forces applied by the fingertips must be scaled to the object’s weight. When lifting a series of objects, forces are usually scaled according to recent experience from previously lifted objects, an effect often referred to as sensorimotor memory. In this study, we investigated the specific time period during which stored information from previous object manipulation is used to mediate sensorimotor memory. More specifically, we examined whether sensorimotor memory was based on weight information obtained between object contact and lift completion (lifting phase) or during stable holding (holding phase). Participants lifted objects in virtual reality that could increase or decrease in weight after the object was lifted and held in the air. In this way, we could distinguish whether the force planning in the next lift was scaled depending on weight information gathered from either the dynamic lifting or static holding period. We found that force planning was based on the previous object weight experienced during the lifting, but not holding, phase. This suggest that the lifting phase, while merely lasting a few hundred milliseconds, is a key time period for building up internal object representations used for planning future hand-object interactions.

HIGHLIGHTS

  • When lifting objects, fingertip force scaling is based on the most recent lift

  • We investigated what time period is critical for acquiring sensorimotor memory

  • Sensorimotor memory is based on weight experienced during previous lift, not hold

  • The lifting phase is a key period for building up internal models of object lifting

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
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Posted November 07, 2018.
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Sensorimotor Memory for Object Weight is Based on Previous Experience During Lifting, Not Holding
Vonne van Polanen, Marco Davare
bioRxiv 464693; doi: https://doi.org/10.1101/464693
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Sensorimotor Memory for Object Weight is Based on Previous Experience During Lifting, Not Holding
Vonne van Polanen, Marco Davare
bioRxiv 464693; doi: https://doi.org/10.1101/464693

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