December 2002
Volume 43, Issue 13
ARVO Annual Meeting Abstract  |   December 2002
Eye-hand Coordination During Reaching in 3D Space: Binocular Fixation and Internal Models
Author Affiliations & Notes
  • DY P Henriques
    York University Toronto ON Canada
  • PW Medendorp
    York University Toronto ON Canada
  • CC A M Gielen
    Medical Physics and Biophysics University of Nijmegen Nijmegen Netherlands
  • JD Crawford
    Psychology Biology and Kinesiology
    York University Toronto ON Canada
  • Footnotes
    Commercial Relationships   D.Y.P. Henriques, None; P.W. Medendorp, None; C.C.A.M. Gielen, None; J.D. Crawford, None. Grant Identification: NSERC, CIHR
Investigative Ophthalmology & Visual Science December 2002, Vol.43, 4667. doi:
  • Views
  • Share
  • Tools
    • Alerts
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      DY P Henriques, PW Medendorp, CC A M Gielen, JD Crawford; Eye-hand Coordination During Reaching in 3D Space: Binocular Fixation and Internal Models . Invest. Ophthalmol. Vis. Sci. 2002;43(13):4667.

      Download citation file:

      © ARVO (1962-2015); The Authors (2016-present)

  • Supplements

Abstract: : Purpose: (1) To examine whether shifts in eye location, caused by rotation of the head, are compensated for when reaching to targets in peri-personal space. (2) To examine whether deviations in the binocular gaze points (the point in space where the gaze lines meet) help guide the hand during reaching to remembered targets. Methods: We had 9 subjects place a fingertip on the remembered location of a target LED (30, 38 and 50 cm front the eye) with the head held at one of seven horizontal eccentric positions in the dark. They reached both when they were looking at the target site and when they were looking elsewhere. Search coils were used to record 2-D eye positions, while 3-D location of the eyes, the head and the fingertip were recorded using an Optotrak system. Results: Reaching responses were fairly accurate when gaze was on target, varying little with head position. But when subjects also deviated their gaze from the target, they produced systematic localization errors in direction and depth. Reaching also deteriorated when the fixation point was displaced from the target in depth. Finally, naturally-produced variations in binocular gaze points, when subjects aimed their eyes toward the target site during reaching, did not cause the fingertip to be similarly displaced. Conclusion: The findings suggest that the eye-hand coordination system maintains an internal model of body linkage geometry, and while this representation is much better calibrated for foveal input than non-foveal ones, the brain does not appear to use signals coding for the binocular gaze point to guide reaching.

Keywords: 386 depth • 586 spatial vision • 406 eye movements 

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.