Deaf adults’ brains adapt to enhance peripheral vision
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Researchers at the University of Sheffield and University of York in the United Kingdom studied 16 deaf adults and 16 hearing adults, using functional MRI to observe brain activity.
The study revealed that people deaf from an early age show a redistribution of neural resources in the brain’s visual centers. Specifically, the brains of deaf participants devoted more processing power to far-peripheral vision and less to the central visual field.
This change in brain structure helps explain why deaf adults, who identify as D/deaf encompassing both medical hearing loss and cultural identity, often excel at detecting movement and events in their peripheral vision. Scientists found a greater representation of peripheral vision in both the primary visual cortex and the lateral geniculate nucleus (LGN), a structure that relays visual information deep within the brain.
Professor Charlotte Codina noted the discovery demonstrates the brain’s ability to adapt to sensory environments, improving skills in areas like danger detection. The research suggests the brain doesn’t simply increase overall visual processing, but instead reorganizes existing resources to compensate for the lack of auditory input.
