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The orthogonal orientation shift and spatial filtering

M J Morgan1, A Medford, P Newsome

  • 1Department of Visual Science, Institute of Ophthalmology, London, UK.

Perception
|January 1, 1995
PubMed
Summary
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Visual perception illusions, like the Judd and Zöllner illusions, are not caused by a single mechanism. Spatial filtering and flank orientation significantly influence perceived line orientation and length.

Area of Science:

  • Visual perception
  • Computational neuroscience
  • Psychophysics

Background:

  • A line abutting tilted flanks appears shifted and shortened.
  • Previous theories suggest band-pass spatial filtering and endpoint localization explain these visual effects.
  • The Judd and Zöllner illusions are classic examples of orientation illusions.

Purpose of the Study:

  • To further investigate the implications of spatial filtering on visual illusions.
  • To examine the influence of flank orientation and line length on orientation thresholds and shifts.
  • To explore the relationship between orientation shifts and the Zöllner illusion.

Main Methods:

  • Four experiments were conducted manipulating line length, flank orientation, gap size, and retinal eccentricity.

Related Experiment Videos

  • Orientation thresholds and perceived orientation shifts were measured.
  • Demonstrations of the Zöllner effect with varying contrast were presented.

    • Main Results:

    • Orientation thresholds increased with shorter line lengths and abutting bars.
    • Orientation shifts decreased with small gaps between lines and flanks.
    • Orientation shift magnitude decreased with line length and increased with retinal eccentricity.

    Conclusions:

    • The Judd and Zöllner illusions do not rely on a single underlying perceptual mechanism.
    • Spatial filtering and flanker interactions play a significant role in orientation perception.
    • Findings support a complex interplay of factors in visual illusions.