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Related Concept Videos

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Design and Use of an Apparatus for Presenting Graspable Objects in 3D Workspace
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Different learned coordinate frames for planning trajectories and final positions in reaching.

Claude Ghez1, Robert Scheidt, Hank Heijink

  • 1Department of Neuroscience, Columbia University Medical Center, New York, NY 10032, USA. cpgl@columbia.edu

Journal of Neurophysiology
|September 7, 2007
PubMed
Summary

The brain uses distinct spatial frames for planning hand movement trajectory and final position. This research clarifies how reach planning integrates hand-centered and eye-centered representations.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Human reaching movements are controlled by superimposed mechanisms for trajectory and final position.
  • Previous research presented conflicting evidence on whether reach planning uses hand-centered or eye-centered representations.

Purpose of the Study:

  • To investigate if the brain maintains separate spatial goals for hand trajectory and final position planning.
  • To determine the coordinate frames used for representing movement trajectory and final position during reaching tasks.

Main Methods:

  • Subjects performed a movement reversal (
  • slicing
  • ) task and a single-target stabilization (
  • reaching
  • ) task under visuomotor rotation.
  • Learning generalization was assessed across untrained initial positions and movement directions.
  • The study analyzed the effects of shifting initial hand position on reversal locations and final positions.

Main Results:

  • Shifting initial hand position differentially affected reversal locations and final positions.
  • Slicing task reversal locations showed generalization consistent with a hand-centered representation.
  • Reaching and slicing final positions generalized consistently with an eye-centered representation.

Conclusions:

  • The brain utilizes distinct coordinate frames for representing intended hand trajectory and final position.
  • This finding reconciles previous conflicting evidence regarding hand-centered and eye-centered representations in reach planning.
  • Motor control integrates both hand-centered and eye-centered spatial information for planning complex movements.