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Behavioral reference frames for planning human reaching movements.

Sabine M Beurze1, Stan Van Pelt, W Pieter Medendorp

  • 1Nijmegen Institute for Cognition and Information, Radboud University of Nijmegen, Nijmegen, The Netherlands. s.beurze@nici.ru.nl

Journal of Neurophysiology
|March 31, 2006
PubMed
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This study on reaching movements suggests an eye-centered frame is crucial for integrating hand and target positions. Pointing errors indicate this, not a body-centered reference frame, for sensorimotor transformations.

Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Sensorimotor transformations require aligning hand and target information within a common reference frame.
  • Two primary hypotheses for this frame are eye-centered and body-centered coordinate systems.
  • Understanding the reference frame is key to explaining reaching movement errors.

Purpose of the Study:

  • To investigate whether eye-centered or body-centered frames are used for sensorimotor transformations in reaching movements.
  • To analyze pointing errors under different visual feedback conditions (seen-hand vs. unseen-hand).
  • To determine the reference frame involved in computing the hand-to-target difference vector.

Main Methods:

  • Subjects performed reaching movements to memorized targets from various initial hand positions with fixed gaze.

Related Experiment Videos

  • Two conditions were used: unseen-hand (no visual hand feedback during planning) and seen-hand (visual feedback of hand and target).
  • Pointing errors were analyzed to infer the reference frame used for movement planning.

    • Main Results:

    • Both initial hand position and gaze direction significantly influenced pointing error magnitude and direction.
    • Pointing errors were substantially smaller in the seen-hand condition compared to the unseen-hand condition.
    • Reference frame analysis indicated errors originated from eye-centered or hand-centered stages, but not a body-centered stage.

    Conclusions:

    • The findings support an eye-centered mechanism for integrating target and hand position during reaching movement programming.
    • A body-centered reference frame does not appear to be the primary system for computing the movement vector.
    • Simple gain modulation of eye-centered signals can potentially explain the observed pointing errors.