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      Task-dependent vestibular feedback responses in reaching

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      Creators
      Keyser, J.
      Medendorp, W.P.
      Selen, L.P.J.
      Date of Archiving
      2017
      Archive
      Radboud Data Repository
      Data archive handle
      https://hdl.handle.net/11633/di.dcc.DSC_2016.00215_976
      Related publications
      Task-dependent vestibular feedback responses in reaching  
      Publication type
      Dataset
      Access level
      Restricted access
      Please use this identifier to cite or link to this item: https://hdl.handle.net/2066/203834   https://hdl.handle.net/2066/203834
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      Organization
      SW OZ DCC SMN
      Audience(s)
      Life sciences
      Languages used
      English
      Key words
      galvanic vestibular stimulation; Minimum intervention principle; vestibulomotor; feedback control
      Abstract
      When reaching for an earth-fixed object during self-rotation, the motor system should appropriately integrate vestibular signals and sensory predictions to compensate for the intervening motion and its induced inertial forces. While it is well established that this integration occurs rapidly, it is unknown if vestibular feedback is processed dependent on the behavioral goal. Here, we studied whether vestibular signals evoke fixed responses with the aim to preserve the hand trajectory in space or are processed more flexibly, correcting trajectories only in task-relevant spatial dimensions. We used galvanic vestibular stimulation (GVS) to perturb reaching movements toward a narrow or a wide target. Results show that the same vestibular stimulation led to smaller trajectory corrections to the wide than the narrow target. We interpret this reduced compensation as a task-dependent modulation of vestibular feedback responses, tuned to minimally intervene with the task-irrelevant dimension of the reach. These task-dependent vestibular feedback corrections are in accordance with a central prediction of optimal feedback control theory and mirror the sophistication seen in feedback responses to mechanical and visual perturbations of the upper limb.
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      • Datasets [1237]
      • Faculty of Social Sciences [27115]
       
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