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Eye-hand coordination in reaching and grasping vertically moving targets.

Matsya R Thulasiram1, Ryan W Langridge2, Hana H Abbas2

  • 1Perception and Action Lab, Department of Psychology, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada. thulasim@myumanitoba.ca.

Experimental Brain Research
|May 9, 2020
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Summary

Gaze focuses on the leading edge of vertically moving targets during reach and grasp. The thumb

Keywords:
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Area of Science:

  • Neuroscience
  • Human Motor Control
  • Visual Perception

Background:

  • Previous research shows a visual bias towards the index finger in reach-and-grasp tasks.
  • The role of gaze fixation in visually guided reaching for vertically moving targets remains less understood.
  • Understanding gaze control is crucial for explaining visually guided movements.

Purpose of the Study:

  • To investigate whether the index finger or thumb is a primary gaze focus for vertically translating targets.
  • To examine how gaze behavior changes during reach-and-grasp of upward versus downward moving targets.
  • To elucidate the role of the thumb in visually guided grasping of downward targets.

Main Methods:

  • Participants performed right-handed reach-to-grasp movements towards 2-D targets moving vertically on a screen.
  • Gaze fixations were recorded during anticipatory periods, movement onset, reach onset, and grasp.
  • Analysis focused on fixation locations relative to target position and movement direction.

Main Results:

  • Anticipatory fixations were directed towards the eventual movement path.
  • Fixations shifted to the leading edge upon movement onset, then to the center for downward targets at reach onset.
  • The thumb's placement influenced fixation for downward targets, suggesting a collaborative role with the index finger.

Conclusions:

  • Gaze control for vertically moving targets involves anticipatory and reactive fixation strategies.
  • The index finger is a primary gaze focus, but the thumb gains importance for downward moving targets.
  • These findings highlight the evolving role of the thumb in mediating complex reach-and-grasp actions.