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Quantifying object salience by equating distractor effects.

Liqiang Huang1, Harold Pashler

  • 1Department of Psychology, University of California, San Diego, 9500 Gillman Dr., La Jolla, CA 92093, USA.

Vision Research
|March 31, 2005
PubMed
Summary
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Object salience, or how much an item stands out, was measured by its distraction effect. Salience increases with size or luminance disparity, following a logarithmic relationship similar to Weber's Law.

Area of Science:

  • Visual perception
  • Psychophysics
  • Cognitive science

Background:

  • Object salience is often subjectively measured by observer reports.
  • Previous methods relied on direct questioning about an object's conspicuousness.
  • A more objective measure of salience is needed, particularly in search tasks.

Purpose of the Study:

  • To objectively measure object salience using distraction in a visual search task.
  • To investigate the relationship between feature disparities (size, luminance) and object salience.
  • To quantify the combined effects of size and luminance disparity on salience.

Main Methods:

  • Participants searched for a pre-specified target among background items.
  • Salience was quantified by measuring the response time (distraction) caused by a key distractor.

Related Experiment Videos

  • Feature disparities in size and luminance between the target, distractor, and background were systematically varied.

    • Main Results:

    • Object salience is determined by the ratio of its feature value to background feature values, consistent with Weber's Law.
    • Logarithmic salience increases with both size and luminance disparity, with comparable rates.
    • Combined size and luminance disparities yield a salience sum greater than vector addition but less than scalar addition.

    Conclusions:

    • Distraction in visual search provides a quantifiable measure of object salience.
    • Salience is logarithmically related to feature disparities, supporting psychophysical principles.
    • The combined effect of multiple feature disparities on salience is interactive, not purely additive.