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Related Experiment Videos

The P&p illusion.

D Diener1

  • 1University of Nevada, Las Vegas.

Perception & Psychophysics
|January 1, 1990
PubMed
Summary

Uppercase and lowercase letters can appear different in size due to visual perception illusions. This study identifies two key factors influencing this size illusion, particularly with letters like "p".

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Area of Science:

  • Visual Perception
  • Cognitive Psychology
  • Psychophysics

Background:

  • The perception of letter size can be influenced by their case (uppercase vs. lowercase).
  • This phenomenon is particularly noticeable with specific letterforms, such as 'p'.

Purpose of the Study:

  • To investigate the factors contributing to the visual illusion where identical letters appear to differ in size based on case.
  • To analyze how surrounding letter case and the interpretation of ascenders/descenders affect this size perception.

Main Methods:

  • Subjects estimated the magnitude of the size difference illusion for various stimuli.
  • The study examined the influence of surrounding letter size and case.
  • Analysis focused on stimuli with potential ascenders or descenders.

Main Results:

  • Two primary factors were identified as influencing the letter size illusion.
  • One factor is solely dependent on the interpretation of a letter as uppercase or lowercase.
  • The second factor relates to the interpretation of vertical lines as ascenders or descenders, affecting perceived loop size.

Conclusions:

  • The perceived size difference between uppercase and lowercase letters is a complex visual illusion.
  • This illusion is modulated by contextual cues, including surrounding letter case and the structural features of individual letters.

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