Brain re-wires to enhance peripheral vision in deaf adults

New research published in the Proceedings of the National Academy of Sciences (PNAS) indicates that the brains of individuals who have been deaf from an early age undergo structural re-wiring to enhance peripheral vision. By studying 16 adults with early, profound deafness and 16 hearing adults using functional MRI, researchers from the University of Sheffield and the University of York identified a redistribution of neural resources.

The study found that D/deaf participants showed a greater representation of far-peripheral vision in both the primary visual cortex and the lateral geniculate nucleus (LGN), a deep visual relay structure. This adaptation does not represent an increase in total visual processing capacity, but rather a shift where more neural resources are devoted to the periphery and fewer to the central visual field. This neurological change may provide an advantage in detecting movement or potential dangers outside the central field of view.