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Related Experiment Videos

A salient distractor does not disrupt conjunction search.

D Lamy1, Y Tsal

  • 1Department of Psychology, Tel Aviv University, Israel. domi@freud.tau.ac.il

Psychonomic Bulletin & Review
|August 30, 2002
PubMed
Summary

Visual search involves both bottom-up and top-down attention. This study found that salient distractors interfere with target-absent trials, suggesting salience-based and top-down processes are alternative, not joint, attentional guidance modes.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Leading theories suggest bottom-up and top-down factors jointly guide attention.
  • Some evidence indicates top-down guidance may dominate when targets have specific features.
  • Conjunction search tasks involve identifying targets based on multiple features.

Purpose of the Study:

  • To investigate whether salience-based (bottom-up) and top-down attentional guidance operate jointly or as alternatives.
  • To examine the impact of salient distractors in a conjunction visual search task.
  • To determine the interaction between feature-defined target search and distractor salience.

Main Methods:

  • Participants performed a conjunction search for a green O among green Ts and red Os.

Related Experiment Videos

  • Salient distractors varying in shape, color, or both (e.g., green X, blue O, blue X) were introduced.
  • Performance was measured on both target-present and target-absent trials.

    • Main Results:

    • Salient distractors did not impede performance when the target was present.
    • A significant interference effect was observed on target-absent trials with salient distractors.
    • This interference suggests a distinct role for salience-based processing.

    Conclusions:

    • Salience-based (bottom-up) and top-down attentional guidance function as alternative modes for allocating attentional priority.
    • These processes do not appear to be joint contributors in visual search under these conditions.
    • The findings challenge models that assume simultaneous, integrated operation of both attentional systems.