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Related Experiment Videos

Cortical processing of a brightness illusion.

Anna Wang Roe1, Haidong D Lu, Chou P Hung

  • 1Department of Psychology, 301 Wilson Hall, Vanderbilt University, Nashville, TN 37203, USA. anna.roe@vanderbilt.edu

Proceedings of the National Academy of Sciences of the United States of America
|March 2, 2005
PubMed
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Researchers discovered cells in the monkey visual cortex that respond to illusory brightness, like that seen in the Cornsweet illusion. This finding suggests a hierarchical processing of brightness information from V1 to V2.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Brightness illusions, such as the Cornsweet illusion, demonstrate how borders significantly influence surface brightness perception.
  • Equiluminant surfaces can appear different in brightness due to contrast borders.

Purpose of the Study:

  • To investigate the neural basis of illusory brightness perception in the monkey visual cortex.
  • To identify specific cell populations and brain regions involved in processing brightness illusions.

Main Methods:

  • Electrophysiological recordings were performed in the visual cortex of monkeys.
  • Cells responsive to luminance and the Cornsweet illusion were identified and localized within specific cortical areas.

Main Results:

Related Experiment Videos

  • Luminance-responsive cells were found in color-processing regions (cytochrome oxidase blobs and bridges) of the primary visual cortex (V1).
  • Cells responding to the Cornsweet illusion (illusory brightness) were preferentially located in color-processing regions (thin stripes) of the second visual area (V2).

Conclusions:

  • The colocalization of brightness and color processing in V1 and V2 suggests segregation of contour and surface processing.
  • A hierarchical processing of brightness information from V1 to V2 is proposed based on these findings.