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Related Experiment Videos

A variable mapping task produces symmetrical interference between global information and local information.

J M Shedden1, G S Reid

  • 1Department of Psychology, McMaster University, Hamilton, ON L8S 4K1, Canada. shedden@mcmaster.ca

Perception & Psychophysics
|April 3, 2001
PubMed
Summary
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Global visual processing is faster than local, but ignored local details can still influence perception. Task demands, like stimulus-response mapping, determine if local distractors cause unidirectional or bidirectional interference.

Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Human Information Processing

Background:

  • Global visual targets are typically detected faster and more accurately than local targets.
  • Unidirectional interference is common when attention is focused on global information, with local distractors having minimal behavioral impact.
  • The availability of local information alongside global information raises questions about the observed global dominance.

Purpose of the Study:

  • To investigate the fate of ignored local distractors in compound visual figures.
  • To examine the role of stimulus-response (S-R) mapping in modulating the influence of local distractors.
  • To test a model where early global processing is faster, but local processing can be enhanced by increased task demands.

Main Methods:

Related Experiment Videos

  • Comparison of consistent S-R tasks (favoring global advantage) with variable S-R tasks (requiring more semantic analysis).
  • Behavioral assessment of interference effects from local distractors under different S-R mapping conditions.
  • Analysis of reaction times and accuracy to infer the processing of global and local visual information.

    • Main Results:

    • Consistent S-R tasks showed unidirectional interference, indicating limited influence of local distractors.
    • Variable S-R tasks revealed strong bidirectional interference, suggesting local distractor information was available and impactful.
    • Significant behavioral differences emerged between the consistent and variable S-R tasks.

    Conclusions:

    • The identity of ignored local distractors is accessible even when attention is directed globally.
    • Stimulus-response mapping is a critical factor influencing the degree and direction of interference from local distractors.
    • Global processing may be faster initially, but local processing can become effective with increased cognitive demands.