September 2019
Volume 19, Issue 10
Open Access
Vision Sciences Society Annual Meeting Abstract  |   September 2019
Eye-hand Coordination in Reaching and Grasping Vertically Translating Targets
Author Affiliations & Notes
  • Matsya R. Thulasiram
    Psychology, University of Manitoba
  • Ryan W. Langridge
    Psychology, University of Manitoba
  • Hana H. Abbas
    Psychology, University of Manitoba
  • Jonathan J. Marotta
    Psychology, University of Manitoba
Journal of Vision September 2019, Vol.19, 109b. doi:
  • Views
  • Share
  • Tools
    • Alerts
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      Matsya R. Thulasiram, Ryan W. Langridge, Hana H. Abbas, Jonathan J. Marotta; Eye-hand Coordination in Reaching and Grasping Vertically Translating Targets. Journal of Vision 2019;19(10):109b.

      Download citation file:

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

  • Supplements

Previous research in our lab has revealed a strong visual bias toward the eventual index finger contact location when grasping stationary or horizontally moving targets. However, the unique properties of the thumb may have an increased role when grasping vertically moving targets. Using their index finger and thumb, right-handed individuals reached for and grasped 2-D rectangular targets moving upward or downward on a vertically oriented computer screen. It was expected that fixations would be directed toward the index finger when grasping upward moving targets, and to the thumb when grasping downward moving targets. In trials involving upward moving targets, initial fixations were positioned well above the target, in anticipation of the eventual movement, and remained above the target even after the target started to move. Gaze shifted to the leading (upper) edge of the target when participants initiated their reaching movement, suggesting that participants were primarily attending to the eventual contact location of the index finger. Initial fixations toward downward moving targets were positioned well below its bottom edge, once again anticipating eventual movement. When the targets started to move, gaze shifted upward to a position just below the target’s centre of mass (COM) and remained there during reach onset. Final fixations for both upward and downward moving targets were positioned slightly above the target’s COM, a location that would allow the monitoring of both index and thumb when grasping. These results suggest that while index finger placement is prioritized when grasping upward moving targets, visual attention is directed toward more central locations when grasping downward moving targets, thus allowing both contact points to be monitored simultaneously. This is suggestive of an increased importance of the thumb, in addition to the index finger placement, not shown previously when grasping stationary or horizontally translating targets.

Acknowledgement: NSERC Discovery Grant, NSERC Undergraduate Student Research Award 

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.