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Related Experiment Video

Updated: May 18, 2026

Measuring Connectivity in the Primary Visual Pathway in Human Albinism Using Diffusion Tensor Imaging and Tractography
13:26

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Published on: August 11, 2016

Changes in brain morphology in albinism reflect reduced visual acuity.

Holly Bridge1, Elisabeth A H von dem Hagen2, George Davies3

  • 1FMRIB Centre, John Radcliffe Hospital, Oxford, United Kingdom; Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|October 9, 2012
PubMed
Summary

Albinism impacts vision, causing altered brain structure. Studies show increased cortical thickness in V1 and decreased gyrification in the occipital lobe in individuals with albinism.

Keywords:
AlbinismCortical thicknessGray matterGyrificationStructural MRIVisual acuity

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Genetics

Background:

  • Albinism significantly affects the visual system, impacting acuity and binocular function.
  • Optic nerve fiber misrouting at the chiasm is characteristic of albinism.
  • The structural consequences of this misrouting on the post-chiasmatic visual pathway, especially the occipital lobes, remain poorly understood.

Purpose of the Study:

  • To investigate the structural changes in the occipital lobes of individuals with albinism.
  • To correlate these structural changes with visual function.

Main Methods:

  • Whole-brain analysis of cortical thickness in a large cohort of subjects with albinism and control subjects.
  • Analysis of gyrification in the occipital lobe.

Main Results:

  • Increased cortical thickness in V1, particularly in the foveal representation area, was observed in subjects with albinism.
  • Mean cortical thickness in V1 was greater in albinism and negatively correlated with visual acuity.
  • Decreased gyrification was found in the left ventral occipital lobe of individuals with albinism.

Conclusions:

  • The observed V1 cortical thickness increase may result from a lack of synaptic pruning, similar to congenitally blind individuals.
  • Reduced gyrification in the ventral extrastriate cortex might stem from diminished input to foveal regions.
  • These findings highlight structural adaptations in the visual cortex associated with albinism-related visual pathway alterations.