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Related Experiment Videos

Early 'visual' cortex activation correlates with superior verbal memory performance in the blind.

Amir Amedi1, Noa Raz, Pazit Pianka

  • 1Neurobiology Department, Life Science Institute, Hebrew University, Jerusalem 91904, Israel. amir@lobster.ls.huji.ac.il

Nature Neuroscience
|June 17, 2003
PubMed
Summary

The visual cortex in blind individuals shows significant brain activity during memory and language tasks, suggesting enhanced brain plasticity. This occipital cortex activation correlates with improved verbal memory performance.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Neuroimaging

Background:

  • The traditional view posits limited plasticity in the adult visual cortex.
  • Congenital blindness presents an opportunity to study cross-modal cortical reorganization.
  • Functional magnetic resonance imaging (fMRI) allows non-invasive investigation of brain activity.

Purpose of the Study:

  • To investigate the functional role and plasticity of the occipital cortex in congenitally blind individuals.
  • To explore cross-modal functional reorganization in the visual cortex.
  • To correlate occipital activation with cognitive performance in blind participants.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed in ten congenitally blind participants and sighted controls.

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  • Participants performed verbal-memory, verb generation, and Braille reading tasks.
  • Analysis focused on occipital cortex activation patterns and their relationship to cognitive abilities.

    • Main Results:

    • Robust occipital activation was observed in blind individuals during verbal-memory and verb generation tasks, absent in sighted controls.
    • Evidence of anterior-posterior specialization within the occipital cortex was found, with anterior regions favoring Braille and posterior regions (including V1) favoring verbal tasks.
    • Higher V1 activation during verbal-memory tasks correlated significantly with superior verbal-memory performance in the blind group.

    Conclusions:

    • The visual cortex is more modifiable than previously thought, demonstrating significant cross-modal plasticity in congenital blindness.
    • Specialization within the reorganized occipital cortex supports cognitive functions like verbal memory and Braille processing.
    • Occipital activation in blind individuals is not merely epiphenomenal but plays a functional role in enhancing cognitive abilities.