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Visualizing Visual Adaptation
04:43

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Published on: April 24, 2017

Chromatic Vasarely effect.

Avital Tsofe1, Yulia Yucht, Jenny Beyil

  • 1Department of Biomedical Engineering, Faculty of Engineering, Tel-Aviv University, 69978 Tel-Aviv, Israel.

Vision Research
|July 13, 2010
PubMed
Summary
This summary is machine-generated.

The chromatic Vasarely effect creates illusory colors in nested squares with color gradients. Sharper angles enhance the perceived length and color intensity of these visual illusions.

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Area of Science:

  • Visual perception
  • Color science
  • Computational modeling

Background:

  • Vasarely's 'nested-squares' illusion involves luminance gradients creating a glowing 'X'.
  • This effect is based on the perception of illusory contours and brightness contrasts.

Purpose of the Study:

  • To investigate the 'chromatic Vasarely effect' using color gradients instead of luminance gradients.
  • To psychophysically measure the strength of the chromatic Vasarely effect under iso-brightness conditions.

Main Methods:

  • Presenting stimuli with chromatic gradients in concentric angles under constant brightness.
  • Using psychophysical testing to measure the length and color of illusory folds.
  • Comparing experimental results with predictions from a chromatic first-order adaptation computational model.

Main Results:

  • Illusory folds exhibit complementary colors to the stimuli.
  • A wide range of stimulus colors and angles produced significant perceived colors.
  • Sharper angles in stimuli significantly increased the strength of the perceived illusory fold (length and chroma).

Conclusions:

  • The chromatic Vasarely effect demonstrates illusory color perception driven by chromatic gradients.
  • The strength of this effect is angle-dependent, being stronger with sharper angles.
  • A chromatic first-order adaptation model successfully predicts key aspects of the observed chromatic Vasarely effect.