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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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Centre-surround effects on perceived orientation in complex images.

Erin Goddard1, Colin W G Clifford, Samuel G Solomon

  • 1School of Psychology, The University of Sydney, Sydney, Australia. ering@psych.usyd.edu.au <ering@psych.usyd.edu.au>

Vision Research
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PubMed
Summary
This summary is machine-generated.

The simultaneous tilt illusion, affecting orientation perception, is stronger with natural textures than gratings. This visual illusion is robust in natural images, even when their phase spectra are randomized.

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Area of Science:

  • Visual Perception
  • Computational Neuroscience
  • Image Processing

Background:

  • The simultaneous tilt illusion demonstrates how surrounding orientations influence perceived orientation.
  • Previous studies primarily used simple stimuli like sinusoidal gratings.

Purpose of the Study:

  • To investigate orientation perception in natural images and textures using the simultaneous tilt illusion.
  • To determine how statistical properties of textures affect the strength of the tilt illusion.

Main Methods:

  • Utilized the simultaneous tilt illusion paradigm.
  • Compared observer judgments of average orientation for textures versus sinusoidal gratings.
  • Investigated the effect of surrounding texture orientation range, including those without clear orientation.
  • Examined the impact of randomizing phase spectra of natural images.

Main Results:

  • The simultaneous tilt illusion is stronger when judging the average orientation of natural textures compared to sinusoidal gratings.
  • The illusion can be induced by surrounding textures with a wide range of orientations, even ambiguous ones.
  • Natural images robustly induce the illusion, which is further amplified by randomizing their phase spectra.

Conclusions:

  • Orientation perception in natural images is susceptible to contextual influences similar to the simultaneous tilt illusion.
  • The findings suggest that orientation processing models should account for the statistical properties of natural stimuli.
  • A simple model of orientation processing can explain the observed effects of the illusion with natural textures and images.