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Related Experiment Video

Updated: Jun 23, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
06:46

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

Coordinate transformations for hand-guided saccades.

L Ren1, J D Crawford

  • 1Department of Kinesiology, Centre for Vision Research, York University, Toronto, ON, Canada. lei_ren@yorku.ca

Experimental Brain Research
|May 1, 2009
PubMed
Summary
This summary is machine-generated.

Proprioception influences eye-hand coordination, causing directional saccade errors. These errors originate in limb coordinates, not head orientation, suggesting somatosensory transformations account for head position.

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Area of Science:

  • Neuroscience
  • Oculomotor control
  • Proprioception

Background:

  • Eye-hand coordination relies on integrating visual and proprioceptive information.
  • Previous research indicated direction-dependent saccade errors (anisotropic overshoots) during active hand movements.
  • A hypothesis proposed these errors stem from limb-centered efference copy uncompensated into head coordinates.

Purpose of the Study:

  • To test the hypothesis that anisotropic saccade errors originate in limb coordinates.
  • To investigate the role of head orientation signals in transforming limb-centered information for saccade control.
  • To dissociate limb and head coordinate frames in eye-hand coordination.

Main Methods:

  • Twelve subjects performed saccades to hand-held targets in a dark room.
  • Four conditions were tested: right/left hand with head centered, and right hand with head tilted.
  • Saccade errors were analyzed for anisotropy and effect of head tilt.

Main Results:

  • Anisotropic saccade overshoots, aligned with the forearm axis, were observed for both hands.
  • Saccade errors were smaller for the left hand but showed a symmetrical pattern reversal.
  • Head tilt did not induce systematic saccade direction errors and anisotropic errors did not rotate with the head.

Conclusions:

  • The transformation of somatosensory information into oculomotor commands accounts for head orientation.
  • Anisotropic amplitude errors in hand-guided saccades are rooted in limb coordinates.
  • Proprioception's role in eye-hand coordination involves limb-based coordinate transformations for saccade control.