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Related Experiment Video

Updated: Jul 11, 2026

Irrelevant Stimuli and Action Control: Analyzing the Influence of Ignored Stimuli via the Distractor-Response Binding Paradigm
12:12

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Published on: May 14, 2014

Age differences in the distractor-ratio effect as a function of contrast level.

Cale White1, Dana Wheatley, Olga Konwisorz

  • 1Department of Psychology, University of Calgary, Calgary, Alberta, Canada.

Neuropsychology, Development, and Cognition. Section B, Aging, Neuropsychology and Cognition
|September 11, 2007
PubMed
Summary

Age and contrast do not significantly alter the distractor-ratio effect (DRE) in visual search for either younger or older adults. However, older adults may exhibit increased cautiousness during visual search tasks with low signal strength.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Vision Science

Background:

  • The distractor-ratio effect (DRE) in visual search describes how the ratio of different distractor types influences search performance.
  • Understanding age-related differences in visual search is crucial for cognitive aging research.

Purpose of the Study:

  • To investigate the impact of age and luminance contrast on the distractor-ratio effect (DRE) in visual search.
  • To compare reaction times (RT) and eye movement patterns between younger and older adults.

Main Methods:

  • A contrast x orientation conjunction search task was employed.
  • The study manipulated the ratio of white to black distractors and luminance contrast levels.
  • Reaction times (RT) and eye movement metrics (e.g., number of fixations) were recorded.

Main Results:

  • The distractor-ratio manipulation affected both younger and older adults similarly in terms of RT and fixation count.
  • On target-absent trials, increased RT and fixation count correlated with more distractors sharing the target's contrast polarity.
  • Eye movement analysis indicated younger adults were more efficient in managing distractor sets.

Conclusions:

  • Age and contrast levels do not significantly alter the DRE in visual search.
  • Generalized slowing may explain age-related RT differences, while increased cautiousness might explain fixation patterns in older adults, especially with low signal strength.