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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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Decoding Reach Direction in Early "Visual" Cortex of Congenitally Blind Individuals.

Łukasz Bola1, Petra Vetter2, Mohr Wenger3

  • 1Institute of Psychology, Polish Academy of Sciences, Warsaw, 00-378, Poland lbola@psych.pan.pl amir.amedi@idc.ac.il.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 2, 2023
PubMed
Summary
This summary is machine-generated.

Action representations in the early visual cortex (EVC) do not require vision. Brain activity in congenitally blind humans shows that the EVC can process reach direction, independent of visual experience or imagery.

Keywords:
MVPA visual cortexactionsdorsal streamfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Sensory Processing

Background:

  • The early visual cortex (EVC) was traditionally believed to process only visual input.
  • Emerging research suggests EVC involvement in non-visual functions, including action processing.
  • It remains debated whether this processing relies on visual imagery or is independent of visual experience.

Purpose of the Study:

  • To investigate whether the early visual cortex (EVC) in congenitally blind humans can represent action-related information.
  • To determine if visual experience or imagery is necessary for EVC's role in action representation.
  • To explore the spatial organization of action representations within the EVC and other brain areas in the absence of vision.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Researchers decoded reach direction from EVC activity in individuals with congenital blindness.
  • Decoding accuracy was analyzed across different EVC subregions and within dorsal stream areas.

Main Results:

  • Reach direction could be reliably decoded from the EVC of congenitally blind individuals.
  • Neither visual experience nor visual imagery was necessary for this action representation in EVC.
  • Decoding accuracy was highest in foveal-representative EVC areas and decreased in peripheral areas, suggesting a potential hard-wired alignment mechanism.
  • Action representations were also found in dorsal stream areas critical for visuo-motor integration in sighted individuals.

Conclusions:

  • The early visual cortex (EVC) can represent motor actions independently of visual experience or imagery.
  • The brain develops action and spatial representations even without lifelong vision.
  • Findings suggest that the neural basis of action representation may be largely independent of visual input.