The sensory cortex and visual cortex are far away from each other. How do those tactile neurons "know" {a} that there's vacant property in the visual cortex; {b} that hooking up with those unoccupied neurons helps turn fingertip information into "reading"; and {c} how to send axonal projections to this new cortical continent? All are matters of ongoing research.
( Robert M. Sapolsky )
[ Behave: The Biology of Humans ]
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