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      Vestibular modulation of visuomotor feedback gains in reaching

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      Creators
      Oostwoud Wijdenes, L.
      Beers, R.J. van
      Medendorp, W.P.
      Date of Archiving
      2019
      Archive
      Radboud Data Repository
      Data archive handle
      https://hdl.handle.net/11633/aaciilse
      Related publications
      Vestibular modulation of visuomotor feedback gains in reaching  
      Publication type
      Dataset
      Access level
      Restricted access
      Please use this identifier to cite or link to this item: https://hdl.handle.net/2066/205655   https://hdl.handle.net/2066/205655
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      Organization
      SW OZ DCC SMN
      Audience(s)
      Life sciences
      Languages used
      English
      Key words
      online feedback; motor control; self-motion; vestibular system; sensorimotor integration
      Abstract
      Humans quickly and sophisticatedly correct their movements in response to changes in the world, such as when reaching to a target that abruptly changes its location. The vigor of these movement corrections is time-dependent, increasing if the time left to make the correction decreases, which can be explained by Optimal feedback control (OFC) theory as an increase of optimal feedback gains. It is unknown if corrections for changes in the world are as sophisticated under full-body motion. For successful visually-probed motor corrections during full-body motion not only the motion of the hand relative to the body needs to be taken into account, also the motion of the hand in the world should be considered, because their relative positions are changing. Here, in two experiments, we show that visuomotor feedback corrections in response to target jumps are more vigorous for faster passive full-body translational acceleration than for slower acceleration, suggesting that vestibular information modulates visuomotor feedback gains. Interestingly, these corrections do not demonstrate the time-dependent characteristics that body-stationary visuomotor feedback gains typically show, such that an Optimal feedback control model fell short to explain them. We further show that the vigor of corrections generally decreased over the course of trials within the experiment, as if the sensorimotor system adjusted its gains when learning to integrate the vestibular input into hand motor control.
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      • Faculty of Social Sciences [27292]
       
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