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Related Experiment Videos

Envelope size-tuning for transient disparity vergence.

M Sato1, M Edwards, C M Schor

  • 1Vision Science Group, School of Optometry, 360 Minor Hall, University of California at Berkeley, Berkeley, CA 94720-2020, USA.

Vision Research
|May 12, 2001
PubMed
Summary
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The transient-vergence system shows broad tuning for the overall size of binocular targets, responding best to equal sizes but still reacting to a wide range of unequal sizes. This indicates a non-linear process in visual perception.

Area of Science:

  • Vision Science
  • Neuroscience
  • Perception

Background:

  • The transient-vergence system previously showed preference for dichoptic stimuli with high combined energy, irrespective of differences in spatial frequency, contrast, orientation, or luminance polarity.
  • This broadband tuning suggests a second-order, non-linear extraction system.

Purpose of the Study:

  • To investigate the size-tuning properties of binocular channels within the transient-vergence system.
  • To determine how the non-linear extraction of contrast envelopes influences size tuning.

Main Methods:

  • Utilized size-scaled Gabor patches with parallel and orthogonal carrier orientations.
  • Presented stimuli with a large (3.8 degrees) disparity to assess transient-vergence responses.
  • Analyzed responses to both equal and unequal interocular sizes.

Related Experiment Videos

Main Results:

  • The transient-vergence system demonstrated broad band-pass tuning to the overall size of dichoptic targets.
  • Responses were independent of interocular differences in carrier orientation, spatial frequency, or contrast.
  • Equal target sizes yielded more vergence responses than unequal sizes, though responses occurred over a 2-octave range for unequal sizes.
  • Size tuning was broader for smaller envelope sizes than for larger ones.

Conclusions:

  • The broad size tuning for envelope size is likely due to overlapping low-pass frequency spectra of contrast envelopes.
  • Monocular responses to hemi-retinal stimuli over a larger range (3-octave) may contribute to the observed binocular tuning.