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High-frequency hearing in humans

Dear list,

I'm looking for the reasons for the good high-frequency* hearing  in humans.

The reasons I have until now are actually the obvious ones:
* Pinna localization cues
* Interaural level cues (ILD, they actually start to work from around 2 kHz)

What do you think: if there were no need for the ILD and pinna cues, would there be any other reasons?


*) say, above 8 kHz

Piotr Majdak
Psychoacoustics and Experimental Audiology
Acoustics Research Institute <http://www.kfs.oeaw.ac.at>
Austrian Academy of Sciences <http://www.oeaw.ac.at/>
Wohllebengasse 12-14, 1040 Vienna, Austria
Tel.: +43 1 51581-2511
Fax: +43 1 51581-2530