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Perceived depth in non-transitive stereo displays.

Bart Farell1, Cherlyn Ng

  • 1Institute for Sensory Research, Syracuse University, Syracuse, NY, USA.

Vision Research
|December 3, 2014
PubMed
Summary
This summary is machine-generated.

Stereo depth perception is context-dependent, with concurrent stimuli influencing judgments even when attention is directed. The visual system obligatorily pools disparity signals, affecting perceived depth and leading to non-veridical outcomes.

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Area of Science:

  • Visual neuroscience
  • Computational vision
  • Perception psychology

Background:

  • Binocular disparities are crucial for depth perception, with horizontal disparities playing a key role.
  • Stimulus orientation influences perceived depth for one-dimensional stimuli, leading to non-veridical and orientation-dependent depth perception.
  • Perceived depth can violate transitivity (A > B, B > C, yet A ≤ C) in certain configurations.

Purpose of the Study:

  • To investigate how the visual system processes depth from pairwise inconsistent stereo displays.
  • To determine if observers can resolve transitivity violations in depth perception when presented with conflicting stimuli.
  • To understand the role of attention and concurrent stimuli on stereo depth judgments.

Main Methods:

  • Presenting observers with stereo displays containing one-dimensional (grating) and two-dimensional (plaid) stimuli.
  • Measuring depth judgments for stimuli presented in both pairwise inconsistent and depth-consistent displays.
  • Instructing observers to focus on specific stimuli to test attentional effects on depth perception.

Main Results:

  • Depth judgments resolved transitivity violations in inconsistent displays but were inconsistent with judgments in consistent displays.
  • Attentional instructions did not alter the contribution of individual disparity signals to depth judgments.
  • Concurrent stimuli, regardless of relevance, equally influenced perceived depth, indicating obligatory pooling.

Conclusions:

  • Perceived stereo depth is context-dependent, influenced by the disparities of concurrently presented stimuli.
  • The visual system appears to obligatorily pool and compare disparities from multiple stimuli.
  • This pooling mechanism contributes to non-veridical depth perception and explains transitivity violations.