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Visual marking and visual change.

Derrick G Watson1, Glyn W Humphreys

  • 1Department of Psychology, University of Warwick, Coventry, England. d.g.watson@warwick.ac.uk

Journal of Experimental Psychology. Human Perception and Performance
|May 10, 2002
PubMed
Summary
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The preview effect in visual search is disrupted by shape changes, but not by luminance or color changes alone. This suggests inhibition occurs at a location level, not on object features.

Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Neuroscience

Background:

  • The preview effect enhances performance in difficult visual search tasks by presenting distractors earlier.
  • Understanding the precise visual changes that disrupt this effect is crucial for cognitive models.

Purpose of the Study:

  • To investigate which types of visual changes disrupt the preview effect.
  • To elucidate the underlying mechanisms of the preview effect, specifically the role of inhibition.

Main Methods:

  • Five experiments were conducted using visual search tasks.
  • Participants performed search tasks where distractors were presented earlier (preview condition).
  • Different types of visual changes (shape, luminance, color) were introduced to old items at distractor locations.

Related Experiment Videos

Main Results:

  • Shape changes, with or without luminance changes, disrupted the preview effect.
  • Luminance changes alone did not disrupt the preview effect.
  • Isoluminant color changes also failed to disrupt the preview effect.

Conclusions:

  • Low-level visual changes alone are insufficient to abolish the preview effect.
  • The preview effect likely relies on inhibition applied to specific locations within a spatial map.
  • Inhibition mechanisms do not require the application to surface features of objects.