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A population decoding framework for motion aftereffects on smooth pursuit eye movements.

Justin L Gardner1, Stefanie N Tokiyama, Stephen G Lisberger

  • 1Howard Hughes Medical Institute, Bioengineering Graduate Group, W. M. Keck Foundation Center for Integrative Neuroscience, and Department of Physiology, University of California, San Francisco, California 94143, USA. justin@cns.nyu.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 16, 2004
PubMed
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Motion adaptation affects eye movements, repelling pursuit direction and altering speed. These findings suggest a unified framework for understanding visual motion processing in both perception and action.

Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Visual Perception

Background:

  • Perceptual and motor systems decode visual information from large populations of cortical neurons.
  • Motion aftereffects are well-documented in perception, but their impact on motor output is less understood.

Purpose of the Study:

  • To investigate whether motion aftereffects observed in perception manifest similarly in motor control, specifically in smooth pursuit eye movements.
  • To explore a common framework for decoding visual information in both perception and visually guided action.

Main Methods:

  • Adaptation to a moving visual stimulus for 7 seconds.
  • Measuring the direction and speed of subsequent smooth pursuit eye movements.
  • Computer simulations of motion adaptation in the middle temporal visual area (MT) using vector-averaging decoding.

Related Experiment Videos

Main Results:

  • Motion adaptation significantly altered the direction and speed of smooth pursuit eye movements.
  • Pursuit direction was repelled from the adapting direction, and pursuit speed showed complex changes relative to the adapting speed.
  • Adaptation effects were spatially specific to the retinal location of the stimulus and uncorrelated between speed and direction, suggesting independent decoding.

Conclusions:

  • Motion adaptation has strong sequelae in motor output, specifically in smooth pursuit eye movements.
  • Vector-averaging decoding in the middle temporal visual area (MT) can explain the observed effects on pursuit direction.
  • A unified framework for population decoding of motion adaptation in both perception and action is proposed.