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Probing the human stereoscopic system with reverse correlation.

P Neri1, A J Parker, C Blakemore

  • 1University Laboratory of Physiology, Oxford, UK. peter.neri@physiol.ox.ac.uk

Nature
|October 28, 1999
PubMed
Summary
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Human vision uses binocular disparities for depth perception. Reverse correlation reveals early visual processing filters for disparity, mirroring neurons in the primary visual cortex (V1).

Area of Science:

  • Neuroscience
  • Vision Science
  • Psychophysics

Background:

  • Stereoscopic depth perception arises from binocular disparities, the differing views from two eyes.
  • The primary visual cortex (V1) has neurons selective for image element disparity, but further analysis is needed for depth perception.

Purpose of the Study:

  • To investigate disparity processing in human vision using reverse correlation.
  • To identify the characteristics of early visual processing stages involved in stereoscopic depth perception.

Main Methods:

  • Applied reverse correlation psychophysics to human observers.
  • Observers viewed binocular random-dot patterns with signal dots at a specific depth and noise dots with random disparities.
  • Analyzed the correlation between noise dot disparities and the ability to detect the signal depth plane.

Related Experiment Videos

Main Results:

  • Revealed detection 'filters' with disparity selectivity similar to neurons in monkey V1.
  • Demonstrated that opposite contrast noise dots inverted the filter tuning, mirroring V1 neuron responses.
  • Indicated that reverse correlation probes disparity processing at early stages of binocular combination.

Conclusions:

  • Reverse correlation effectively probes early disparity processing in human vision.
  • The identified filters share characteristics with neurons in the primary visual cortex (V1).
  • This processing occurs before the complete stereoscopic depth percept is generated.