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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
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Related Experiment Video

Updated: Jul 12, 2026

Measuring Connectivity in the Primary Visual Pathway in Human Albinism Using Diffusion Tensor Imaging and Tractography
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Published on: August 11, 2016

Congenital blindness reduces myelination in human visual cortex.

Anna-Lena Stroh1,2, Luke J Edwards2,3, Daniel Haenelt2

  • 1Institute of Psychology, Jagiellonian University, ul. Ingardena 6, 30-060 Kraków, Poland.

Science Advances
|July 10, 2026
PubMed
Summary

Congenital blindness reduces myelin and iron in the visual cortex, impacting brain development. Sensory experience is crucial for shaping and stabilizing cortical circuits throughout life.

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Last Updated: Jul 12, 2026

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Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation
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Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation

Published on: December 8, 2023

Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Neuroimaging

Background:

  • Sensory experience is vital for cortical maturation.
  • Cellular effects of sensory deprivation in humans are not well understood.

Purpose of the Study:

  • Investigate the impact of congenital blindness on the human early visual cortex.
  • Examine cellular consequences of absent sensory input on brain structure.

Main Methods:

  • Utilized in vivo sub-millimeter 3 T and 7 T MRI.
  • Employed ultra-high-gradient diffusion MRI to assess brain tissue properties.

Main Results:

  • Reduced R2* and MTsat (markers of iron and myelin) observed in blind individuals.
  • Increased diffusivity, orientation dispersion, and reduced neurite density in gray and white matter.
  • Increased cortical thickness associated with lower myelin and iron, challenging pruning disruption theories.

Conclusions:

  • Congenital blindness is linked to reduced myelination and oligodendrogenesis.
  • Sensory input plays a critical role in shaping and stabilizing cortical circuits.
  • Findings suggest myelination deficits, not disrupted pruning, are key effects of early visual deprivation.