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Using Rapid Serial Visual Presentation to Measure Set-Specific Capture, a Consequence of Distraction While Multitasking
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The depth of distractor processing in search with clutter.

Mary J Bravo1, Hany Farid

  • 1Department of Psychology, Rutgers University, Camden, NJ 08102, USA. mbravo@camden.rutgers.edu

Perception
|August 28, 2007
PubMed
Summary

In visual search tasks, distractor objects are processed differently based on target visibility. When targets are occluded, whole distractors are eliminated; otherwise, search items are not whole objects.

Area of Science:

  • Visual perception
  • Cognitive psychology
  • Human-computer interaction

Background:

  • Visual search tasks often involve identifying a target among numerous distractor items.
  • The cognitive processes underlying distractor object segmentation and recognition during search are not fully understood.
  • Understanding distractor processing is crucial for real-world applications like baggage screening.

Purpose of the Study:

  • To investigate the depth of distractor object processing during visual search in clutter.
  • To determine if observers segment and recognize distractor objects when searching for a target.
  • To examine how distractor type influences search performance under varying task difficulties.

Main Methods:

  • Observers searched cluttered visual displays containing either normal or chimerical distractor objects.

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  • Chimerical distractors were created by combining parts of different recognizable objects.
  • Search task difficulty was manipulated by varying target/distractor discriminability, uncertainty, and occlusion.

    • Main Results:

    • Distractor type significantly affected search performance only when the target was partially occluded.
    • When the target was occluded, observers appeared to eliminate whole distractor objects.
    • No evidence suggested observers selected and rejected whole distractors when the target was unoccluded.

    Conclusions:

    • Distractor processing depth varies with target visibility in cluttered visual search.
    • Partial target occlusion may prompt a strategy of eliminating entire distractor objects.
    • In unoccluded search scenarios, evidence suggests that search items are not processed as whole objects.