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More on "How does a hearing aid help?"

CTB1954 ctb1954 at aol.com
Sat May 17 02:26:11 EST 1997


The current theory, asi I understand it, is that the tonotopic
organization of the cochlea is not precise, that is one hair cell per
frequency.  There is some overlap.  So, if a particular inner hair cell is
gone due to S.N.H.L., surrounding hair cells can "pitch in" (pardon the
pun) partially, to take over the lost hair cell's 
characteristic frequency.  However, an off-frequency hair cell has a
narrower dynamic range for a frequency it's not "tuned to", hence
recruitment.

Now, if  all of the hair cells surrounding are also gone, then you have a
problem.  This is often the case when the S.N.H.L. is due to ototoxic
drugs.  

That's a very simplified, partial answer.  All that time will permit.

Craig T. Barth, M.A., CCC-A
a/k/a/ ctb1954 at aol.com




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