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Related Experiment Videos

The representation of perceived angular size in human primary visual cortex.

Scott O Murray1, Huseyin Boyaci, Daniel Kersten

  • 1Department of Psychology, University of Washington, Box 351525, Seattle, Washington 98195, USA. somurray@u.washington.edu

Nature Neuroscience
|February 8, 2006
PubMed
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Perceived object size influences brain maps. Even with the same retinal size, distant objects appearing larger activate more of the primary visual cortex (V1), showing early integration of size and depth information.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Science

Background:

  • Objects with identical retinal visual angles can be perceived as different sizes based on perceived distance.
  • Size illusions challenge our understanding of how the brain constructs visual reality.

Purpose of the Study:

  • To investigate how the retinotopic map in the primary visual cortex (V1) adapts to perceived size illusions.
  • To determine if perceived size, influenced by depth cues, alters neural representations in V1.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Participants viewed objects designed to elicit size illusions based on perceived distance.

Main Results:

Related Experiment Videos

  • The retinotopic representation of an object in V1 varied with its perceived angular size.
  • Distant objects, appearing larger, activated significantly larger areas in V1 compared to closer objects of equal angular size.

    • Conclusions:

    • The brain combines retinal object size and depth information early in the visual processing stream.
    • Perceived size, not just retinal size, modulates the V1 retinotopic map, impacting visual field representation.