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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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The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
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Related Experiment Video

Updated: May 12, 2026

Measuring Connectivity in the Primary Visual Pathway in Human Albinism Using Diffusion Tensor Imaging and Tractography
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Cross brain reshaping in congenital visual or hearing impairment: triple-network dysfunction.

Jiahong Li1,2, Binbin Xiong3, Suijun Chen1,2

  • 1Department of Otolaryngology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, Guangdong 510120, China.

Brain Communications
|April 30, 2025
PubMed
Summary

Congenital visual or hearing impairments reshape brain function, altering brain activation and connectivity. These sensory impairments reveal shared neural reshaping patterns and a potential triple network anomaly in developing brains.

Keywords:
congenital hearing impairmentcongenital visual impairmentfunctional connectivityresting-state electroencephalographysupport vector machine

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Medical Imaging

Background:

  • Congenital visual and hearing impairments significantly impact child development.
  • Understanding the neural basis of these impairments is crucial for early intervention.
  • Brain plasticity allows for adaptation, but the extent and nature of reshaping are not fully understood.

Purpose of the Study:

  • To investigate how congenital visual or hearing impairment reshapes brain function in children.
  • To identify distinct and shared neural characteristics associated with these impairments.
  • To explore the potential for a triple network anomaly in affected individuals.

Main Methods:

  • Electroencephalography (EEG) was used to evaluate brain activity in 40 children with visual impairment, 40 with hearing impairment, and 42 controls.
  • Advanced EEG analysis techniques included source localization, functional connectivity, and cross-frequency coupling.
  • Machine learning (support vector machines) identified key reshaping characteristics.

Main Results:

  • Visually impaired children showed reduced visual cortex activation; hearing-impaired children showed reduced auditory cortex activation.
  • Both groups exhibited significantly reduced functional connectivity across multiple brain regions.
  • Aberrant connectivity patterns and cross-frequency coupling were observed, particularly in the alpha frequency band.

Conclusions:

  • Congenital visual and hearing impairments lead to significant alterations in brain development and function.
  • Distinct functional changes and shared neural reshaping patterns were identified.
  • Reduced functional connectivity and dysrhythmic activity suggest a potential triple network anomaly.