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High frequency hearing

I am trying to discover the limits of high frequency
hearing in the most sensitive human listeners.

The standard MAF curve(s) are of little use because
a) The data does not extend to very high frequencies
(i.e. it usually stops between 15 and 20 kHz), and
b) the data is based on median results.

Ideally, I would like real data to confirm the
anecdotal evidence that young and/or gifted listeners
can hear up to 25kHz (or beyond?). Equal loudness data
would be useful too, but the most useful information
would be an indication (very very roughly) of the % of
listeners of a particular age who can hear a particular
frequency at a particular amplitude.

Is there anything like this in the published
literature? I have looked several times, but everything
I find stops at 16kHz! Also, anything other than median
results seems very thin on the ground.

Thanks in anticipation of any help - any pointers would
be very greatfully received!


P.S. I can't see the local primary school being too
keen to lend out children for a high frequency
listening test - is this the reason no one else has
studied this?