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I'm curious if this will enable not only the recovery of those cells but also allow us to extend our hearing range

it cannot. The frequency limits of hearing are set by the length (and material properties) of the basilar membrane, not the density of innervation.

Well, functionally speaking your range is set by the cells that you have that are alive, which die slowly over time, starting with the higher frequency ones which tend to be more fragile. If you could restore all the cells you had when you were a child you'd have a larger range than you have now. But you couldn't extend the range beyond what you had when you were born AFAIK.

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