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Position and spatial frequency in large-scale localization judgments.

C A Burbeck1

  • 1Sensory Sciences Research Laboratory, SRI International Menlo Park, CA 94025.

Vision Research
|January 1, 1987
PubMed
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This study investigates spatial localization models, finding that a modified position hypothesis better explains large-scale object localization accuracy than the frequency-channel model.

Area of Science:

  • Visual perception
  • Spatial localization

Background:

  • Hyperacuity explains small-scale spatial localization.
  • Existing models include frequency-channel and position (local-signs) hypotheses.

Purpose of the Study:

  • To evaluate frequency-channel and position models for large-scale spatial localization.
  • To determine factors influencing localization accuracy across object separations.

Main Methods:

  • Measured localization accuracy across a wide range of object separations.
  • Investigated the impact of high- and low-spatial frequency components on accuracy.

Main Results:

  • Replicated the constant Weber fraction for localization.
  • Localization accuracy depends on both high- and low-frequency components.

Related Experiment Videos

  • Neither model fully explained all results initially.

    • Conclusions:

    • A modified position hypothesis qualitatively accounts for all observed results.
    • The frequency-channel hypothesis, even with modifications, does not adequately explain the findings.