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Oculomotor tracking in two dimensions.

K C Engel1, J H Anderson, J F Soechting

  • 1Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Journal of Neurophysiology
|April 14, 1999
PubMed
Summary
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Oculomotor tracking in two dimensions confirms that saccades use position errors and smooth pursuit uses velocity errors. Two-dimensional tracking reveals saccade direction relates to angular positional error and smooth pursuit rotates smoothly.

Area of Science:

  • Oculomotor control
  • Human motor behavior
  • Visual-motor neuroscience

Background:

  • One-dimensional oculomotor tracking shows saccades are position-driven and smooth pursuit is velocity-driven.
  • Generalizing these findings to two-dimensional (2D) tracking is crucial for understanding complex eye movements.

Purpose of the Study:

  • To investigate whether the position-error drive for saccades and velocity-error drive for smooth pursuit generalize to 2D oculomotor tracking.
  • To gain additional insights into 2D eye movement control.

Main Methods:

  • Subjects performed 2D oculomotor tracking tasks involving a target moving in a straight line and then changing direction.
  • Analysis focused on the directional control of saccades and smooth pursuit eye movements.

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Main Results:

  • The primary finding that saccades are position-driven and smooth pursuit is velocity-driven was confirmed in 2D.
  • The initial saccade's direction was primarily determined by angular positional error at its onset.
  • Smooth pursuit movement direction showed a linear relationship with target motion direction (average slope 0.8) and rotated smoothly over time.

Conclusions:

  • The established principles of oculomotor control in 1D extend to 2D tracking.
  • 2D tracking reveals that saccade direction is influenced by angular positional error, and smooth pursuit exhibits continuous rotational adaptation to target motion.