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MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions
09:46

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Published on: May 10, 2012

Surround motion silences signals from same-direction motion.

Peter Neri1, Dennis Levi

  • 1Institute of Medical Sciences, Aberdeen Medical School, Aberdeen, United Kingdom. peter.neri@abdn.ac.uk

Journal of Neurophysiology
|September 4, 2009
PubMed
Summary
This summary is machine-generated.

Surround motion stimuli selectively suppress responses to same-direction motion, acting as a gate. This gain suppression, not tuning changes, is the main perceptual effect of center-surround antagonism in motion processing.

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Area of Science:

  • Neuroscience
  • Perception
  • Vision Science

Background:

  • Neural responses to motion are influenced by surrounding stimuli.
  • These surround effects have measurable perceptual consequences.

Purpose of the Study:

  • To investigate how surround motion affects directional selectivity in human observers.
  • To characterize the perceptual manifestation of center-surround antagonism in motion processing.

Main Methods:

  • Psychophysical reverse correlation was used to analyze human motion perception.
  • Local motion stimuli were presented with and without surrounding motion signals.

Main Results:

  • Surround motion did not affect response gain for opposite-direction signals.
  • Surround motion significantly reduced response gain for same-direction signals, near 100% suppression.
  • This suppression acted as a gating mechanism, effectively silencing same-direction signals.

Conclusions:

  • The primary perceptual effect of center-surround antagonism in motion is gain suppression.
  • Motion in the same direction in the surround gates or silences motion signals.
  • Directional tuning remains largely unchanged despite significant gain modulation.