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Related Experiment Videos

Letter localization, not discrimination, is constrained by attention

P J Bennett1, P D Jaye

  • 1Department of Psychology, University of Toronto, Ontario, Canada. bennett@psych.utoronto.ca

Canadian Journal of Experimental Psychology = Revue Canadienne De Psychologie Experimentale
|December 1, 1995
PubMed
Summary

Attention limits visual processing for locating letters but not for discriminating them. Set size effects are small for letter discrimination, contrasting with previous findings suggesting attention constrains complex pattern discrimination.

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Attention Studies

Background:

  • Previous research indicated attention constrains complex pattern discrimination.
  • Unlimited-capacity models of visual processing did not fully explain set size effects.

Purpose of the Study:

  • To re-examine the role of attention in letter discrimination.
  • To investigate the effect of set size on contrast sensitivity for target identification and localization.

Main Methods:

  • Conducted 5 experiments measuring contrast thresholds for letter identification and localization.
  • Manipulated the number of items (set size) in visual displays.

Main Results:

  • Set size effects were minimal for letter discrimination tasks.

Related Experiment Videos

  • Set size effects were substantial for letter localization tasks.

    • Conclusions:

    • The large set size effects in prior studies may stem from localization demands, not discrimination.
    • Limited processing capacity appears to constrain visual localization, but not letter discrimination.