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Related Experiment Videos

Tracking visual search over space and time.

E S Olds1, W B Cowan, P Jolicoeur

  • 1University of Waterloo, Ontario, Canada. eolds@wlu.ca

Psychonomic Bulletin & Review
|July 26, 2000
PubMed
Summary
This summary is machine-generated.

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Early visual perception, or preattentive processing, is not indivisible. New research shows preattentive color selection can be dissected temporally and spatially, with partial information available before full completion.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Visual perception involves preattentive and attention-demanding stages.
  • Preattentive processing is often considered a single, domain-dependent stage.

Purpose of the Study:

  • To investigate if preattentive visual processing can be temporally and spatially dissected.
  • To challenge the view of preattentive processing as an indivisible stage.

Main Methods:

  • Interrupting preattentive visual processing of color before completion.
  • Modifying an experiment to shift from easy (preattentive) to difficult (attention-demanding) selection.

Main Results:

  • Preattentive selection processing completes by 200 msec after stimulus onset.

Related Experiment Videos

  • Partial selection information is available before the completion of preattentive processing.
  • Partial selection initially occurs near fixation and spreads radially outward.

    • Conclusions:

    • Preattentive visual processing is divisible both temporally and spatially.
    • This finding refines our understanding of the early stages of visual perception.