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The Müller-Lyer illusion Mark II.

B R Degoldi1, R H Day

  • 1Department of Psychology, Monash University, Melbourne, Victoria, Australia.

Perception
|January 1, 1992
PubMed
Summary
This summary is machine-generated.

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A novel size illusion demonstrates that a printed passage appears larger when its surrounding page is cropped. This perceptual compromise between text and page size influences perceived visual extent.

Area of Science:

  • Visual perception
  • Psychophysics
  • Gestalt psychology

Background:

  • Perceptual illusions challenge our understanding of visual processing.
  • The Müller-Lyer illusion demonstrates how context affects perceived length.
  • Previous research has explored various factors influencing size perception.

Purpose of the Study:

  • To describe and explain a new illusion of perceived print size.
  • To investigate the role of the surrounding visual field in size perception.
  • To relate this new illusion to established principles of perceptual organization.

Main Methods:

  • Presentation of a standard A4 sheet with a printed passage (occupying ~50% of the sheet).
  • Comparison of perceived passage size when the full sheet was viewed versus when the sheet was cropped above and below the passage.

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  • Qualitative analysis of the illusion's characteristics and comparison to existing illusions.

    • Main Results:

    • The printed passage appeared larger when the surrounding sheet was cropped compared to the full sheet.
    • The illusion is attributed to a perceptual compromise between the vertical extent of the print and its containing sheet.
    • The effect is analogous to the Müller-Lyer illusion, where context influences perceived extent.

    Conclusions:

    • A new size illusion, termed the 'cropped page illusion,' has been identified.
    • Perceptual compromise between an object and its frame significantly impacts size perception.
    • This illusion provides further evidence for context-dependent processing in the visual system.