Subject: AW: High-frequency hearing in humans From: "reinifrosch@xxxxxxxx" <reinifrosch@xxxxxxxx> Date: Tue, 25 Jan 2011 13:49:51 +0000 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>------=_Part_2387_11426801.1295963391066 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hello Piotr and List, Not only in humans, but in all mammals, the cochlear amplifier (CA) enhance= s soft high-frequency tones by about 40 dB; see e.g. Fig. 5 of Robles and R= uggero, Mechanics of the Mammalian Cochlea, Physiological Reviews 81 (2001)= 1305-1352. According to Fig. 11 of that review, however, soft low-frequenc= y (300 Hz) tones are not significantly amplified by the CA in guinea-pig co= chleae. Details see Chapter 35 of my book "Introduction to Cochlear Waves" = (2010). Reinhart Frosch, Dr. phil. nat., CH-5200 Brugg. reinifrosch@xxxxxxxx . ----Urspr=C3=BCngliche Nachricht---- Von: piotr@xxxxxxxx Datum: 25.01.2011 10:27 An: <AUDITORY@xxxxxxxx> Betreff: 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,=20 would there be any other reasons? Thanks, Piotr *) say, above 8 kHz --=20 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 ------=_Part_2387_11426801.1295963391066 Content-Type: text/html;charset="UTF-8" Content-Transfer-Encoding: quoted-printable <html><head><style type=3D'text/css'> <!-- div.bwmail { background-color:#ffffff; font-family: Trebuchet MS,Arial,Helv= etica, sans-serif; font-size: small; margin:0; padding:0;} div.bwmail p { margin:0; padding:0; } div.bwmail table { font-family: Trebuchet MS,Arial,Helvetica, sans-serif; f= ont-size: small; } div.bwmail li { margin:0; padding:0; } --> </style> </head><body><div class=3D'bwmail'><P><FONT size=3D2>Hello Piotr and List,<= /FONT></P> <P><FONT size=3D2>Not only in humans, but in all mammals, the cochlear ampl= ifier (CA) enhances soft high-frequency tones by about 40 dB; see e.g. Fig.= 5 of Robles and Ruggero, Mechanics of the Mammalian Cochlea, Physiological= Reviews 81 (2001) 1305-1352. According to Fig. 11 of that review, however,= soft low-frequency (300 Hz) tones are not significantly amplified by the C= A in guinea-pig cochleae. Details see Chapter 35 of my book "Introduction t= o Cochlear Waves" (2010).<BR><BR>Reinhart Frosch,<BR>Dr. phil. nat.,<BR>CH-= 5200 Brugg.<BR>reinifrosch@xxxxxxxx .<BR><BR></FONT></P> <BLOCKQUOTE><FONT size=3D2>----Urspr=C3=BCngliche Nachricht----<BR>Von: pio= tr@xxxxxxxx<BR>Datum: 25.01.2011 10:27<BR>An: <AUDITORY@xxxxxxxx= A><BR>Betreff: High-frequency hearing in humans<BR><BR>Dear list,<BR><BR= >I'm looking for the reasons for the good high-frequency* hearing in = humans.<BR><BR>The reasons I have until now are actually the obvious ones:<= BR>* Pinna localization cues<BR>* Interaural level cues (ILD, they actually= start to work from around 2 kHz)<BR><BR>What do you think: if there were n= o need for the ILD and pinna cues, <BR>would there be any other reasons?<BR= ><BR>Thanks,<BR><BR>Piotr<BR>*) say, above 8 kHz<BR><BR>-- <BR>Piotr Majdak= <BR>Psychoacoustics and Experimental Audiology<BR>Acoustics Research Instit= ute <http://www.kfs.oeaw.ac.at><BR>Austrian Academy of Sciences <h= ttp://www.oeaw.ac.at/><BR>Wohllebengasse 12-14, 1040 Vienna, Austria<BR>= Tel.: +43 1 51581-2511<BR>Fax: +43 1 51581-2530</FONT></BLOCKQUOTE></div></= body></html> ------=_Part_2387_11426801.1295963391066--