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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Visual Size Processing in Early Visual Cortex Follows Lateral Occipital Cortex Involvement.

Hang Zeng1, Gereon R Fink2,3, Ralph Weidner2

  • 1Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Center Jülich, Jülich 52425, Germany h.zeng@fz-juelich.de.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
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PubMed
Summary
This summary is machine-generated.

Neural feedback from the lateral occipital cortex (LOC) to the early visual cortex (EVC) shapes perceived object size. Disrupting LOC earlier than EVC impacts illusory size perception, revealing feedback

Keywords:
TMSobjects' size informationvisual processing

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Psychology

Background:

  • Neural activation in the early visual cortex (EVC) reflects perceived, not just retinal, stimulus size.
  • This suggests feedback from higher visual areas, like the lateral occipital cortex (LOC), modulates EVC representations.
  • LOC is implicated in object size processing, but its role in feedback modulation of EVC is unclear.

Purpose of the Study:

  • To investigate the role of feedback from LOC to EVC in visual size perception.
  • To determine the temporal dynamics of information exchange between EVC and LOC during size judgments.
  • To test if LOC feedback is crucial for altered size representations in EVC.

Main Methods:

  • Transcranial magnetic stimulation (TMS) was used to briefly disrupt neural activity in EVC and LOC.
  • Participants performed size judgment tasks in illusory and neutral contexts.
  • TMS was applied at different time windows (early, intermediate, late) to infer causal roles and temporal order.

Main Results:

  • TMS disruption of both EVC and LOC impaired illusory size perception.
  • Disrupting EVC had a later effect on perception compared to disrupting LOC.
  • This temporal difference supports a model where LOC provides feedback to EVC.

Conclusions:

  • Context integration and perceived size changes depend on LOC.
  • These processes modulate representations in EVC via recurrent processing (feedback).
  • Findings highlight the importance of feedback loops in visual perception and size scaling.