normal hearing 2

["Bruno L. Giordano" <bruno.giordano@xxxxxxxxxxxxxxx>]

Dear list,
In a recent posting ("normal hearing", April 2005) I found mention of the 
criteria and of the ISO standards which define normal results for 
audiometric tests.

In the summary posting it is mentioned that non-normal, by definition, is 
anything higher than 0 dB HL, and, again, that non-normal, probably in the 
field of clinical audiology, is anything below 25 dB HL (adults).

Now, my question might seem quite recursive, but:

is there a standard for deciding that the hearing of an individual is not 
standard?

Thank you,
   Bruno

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Bruno L. Giordano, PhD
CIRMMT
Schulich School of Music, McGill University
555 Sherbrooke Street West
Montréal, QC H3A 1E3
Canada