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Related Experiment Videos

Tuning bandwidths for near-threshold stimuli in area MT

K H Britten1, W T Newsome

  • 1University of California, Davis Center for Neuroscience and Section of Neurobiology, Physiology and Behavior, Davis 95616, USA.

Journal of Neurophysiology
|August 15, 1998
PubMed
Summary

Neural directional tuning in the middle temporal area (MT) remains broad even with near-threshold motion stimuli. This suggests visual information is widely distributed, supporting models that pool signals for psychophysical decisions.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Vision Science

Background:

  • Understanding neural coding for visual perception is key.
  • Previous studies measured neuronal tuning with suprathreshold stimuli, unlike psychophysical near-threshold measurements.

Purpose of the Study:

  • To investigate neuronal directional tuning in the middle temporal area (MT) using near-threshold motion stimuli.
  • To determine if directional information is broadly distributed in MT neurons at low stimulus strengths.

Main Methods:

  • Examined directional tuning of MT neurons using perithreshold stochastic motion stimuli.
  • Varied motion signal strength (coherence) independently of direction.
  • Fit Gaussian functions to tuning data and analyzed neural thresholds using signal detection theory.

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Main Results:

  • Directional bandwidth of MT neurons increased modestly as stimulus coherence decreased.
  • Neural thresholds for motion discrimination remained low across a wide range of motion axes.
  • A plateau of high to medium sensitivity extended approximately 45 degrees from the preferred-null axis.

Conclusions:

  • Directional tuning in MT is broad even at near-threshold motion signal levels.
  • Directional information is widely distributed in MT, supporting psychophysical performance.
  • Findings support models where large numbers of neural signals are pooled for perceptual decisions.