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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

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Published on: April 16, 2014

Visual gravity influences arm movement planning.

Alessandra Sciutti1, Laurent Demougeot, Bastien Berret

  • 1Department of Robotics, Brain and Cognitive Sciences, Fondazione Istituto Italiano di Tecnologia, Genoa, Italy.

Journal of Neurophysiology
|March 24, 2012
PubMed
Summary
This summary is machine-generated.

Visuomotor rotation adaptation changes motor plans for arm reaching. The central nervous system adjusts movement velocity profiles based on visual feedback, especially for vertical movements.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Visuomotor rotation paradigms typically use horizontal plane movements.
  • Classical paradigms may not fully capture motor plan changes due to consistent kinematics.
  • Investigating vertical movements offers a novel approach to assess motor plan alterations.

Purpose of the Study:

  • To determine if adaptation to visuomotor rotation alters the motor plan.
  • To investigate how movement direction (horizontal vs. vertical) influences motor plan adaptation.
  • To explore the role of visual feedback in planning arm reaching movements.

Main Methods:

  • Ten subjects performed horizontal and vertical reaching movements.
  • Subjects received rotated visual feedback of their arm motion.
  • Changes in motor plan were assessed by analyzing the velocity profiles of reaching movements.

Main Results:

  • Adaptation to visuomotor rotation significantly altered the symmetry of velocity profiles.
  • This indicates a change in the underlying motor plan.
  • The influence of visual feedback on motor planning was more pronounced for vertical movements.

Conclusions:

  • The central nervous system incorporates visual information into motor planning, even if it leads to less optimal movement trajectories.
  • Motor plan adaptation to visuomotor rotation involves modifying movement kinematics, specifically velocity profiles.
  • The impact of visual orientation on arm movement planning varies, with vertical movements showing a clearer influence.