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Related Experiment Videos

Lateral interception II: predicting hand movements.

Claire F Michaels1, David M Jacobs, Raoul M Bongers

  • 1Center for the Ecological Study of Perception and Action, Department of Psychology, University of Connecticut, Storrs, CT 06269, USA. claire.michaels@uconn.edu

Journal of Experimental Psychology. Human Perception and Performance
|April 26, 2006
PubMed
Summary

This study shows that the optical ratio of lateral optical velocity to expansion velocity accurately predicts hand movements during lateral catching. This optical cue is superior to using lateral ball position for predicting interception trajectories.

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Area of Science:

  • * Visuomotor control
  • * Human motor behavior
  • * Perception and action

Background:

  • * Previous research (Jacobs & Michaels, 2006) suggested optical velocity ratios predict lateral catching hand movements.
  • * These findings were based on the required velocity model of catching (Peper et al., 1994).

Purpose of the Study:

  • * To investigate the predictive power of the optical ratio for hand trajectories in lateral interception.
  • * To compare the optical ratio model with the required velocity model using lateral ball position.

Main Methods:

  • * The optical ratio was used to generate target-position inputs for the vector integration to endpoint model.
  • * The model, with parameters fit to 60 trials, predicted hand trajectories.
  • * Predicted trajectories were compared against observed hand movements.

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Main Results:

  • * The vector integration to endpoint model accurately predicted observed hand movements.
  • * Predictions were particularly accurate under binocular viewing conditions.
  • * The optical ratio model outperformed predictions based solely on lateral ball position.

Conclusions:

  • * The optical ratio, combined with a control law, effectively predicts hand trajectories in lateral interception.
  • * Perceivers continuously integrate visual information (optics) with motor commands.
  • * This study supports the continuous coupling of movement to optical flow in interception tasks.