Re: Reverse traveling wave does not exist (Martin Braun )


Subject: Re: Reverse traveling wave does not exist
From:    Martin Braun  <nombraun(at)TELIA.COM>
Date:    Wed, 31 Mar 2004 13:18:53 +0200

On Tuesday, March 30, 2004, David Mountain wrote: > The design of Ren's experiment has a serious flaw. Aaaah, .......... I see. What I do not see, however, is a flaw. Ren's new paper in Nature Neuroscience is an excellent one, and it will soon be considered as a landmark in cochlear research. It will probably have a similar impact as his 2002 paper in PNAS: first a couple of outcries, and then - after a while - research groups around the globe discussing it and trying to adapt their thinking. A few years ago, members of this list complained about too specific cochlear discussions. Now there is also the Cochlea List, and I replied to David in more detail there: http://mimosa1.incubator.uiuc.edu/pipermail/cochlea/2004-March/001669.html As a more general remark, just let me add this. The notion that otoacoustic emissions (OAEs) depended on a backward traveling wave was unrealistic from the beginning, and it should have been given up immediately (in the early 1980s), when OAEs were recorded in animals where all inner ear traveling waves are anatomically impossible. It should then be added that, with a different experimental design but also in the gerbil, Tianying Ren, Jiefu Zheng, Ning Hu, Yuan Zou, and Alfred L Nuttall also found no evidence for a reverse traveling wave, but instead for AOEs via a fluid compression wave (Abstract 1015 from ARO 2004): http://mimosa1.incubator.uiuc.edu/pipermail/cochlea/2004-March/001669.html Köppl C (1994) Otoacoustic emissions as an indicator for active cochlear mechanics: A primitive property of vertebrate auditory organs. In: Advances in Hearing Research, eds Manley GA, Klump GM, Köppl C, Fastl H, Oeckinghaus H. World Scientific, Singapore, pp 207-216. Ren T (2002) Longitudinal pattern of basilar membrane vibration in the sensitive cochlea. Proceedings of the National Academy of Sciences, USA, early edition, Dec 2, 2002 (pnas.262663699). Ren T (2004) Reverse propagation of sound in the gerbil cochlea. Nature Neuroscience, early edition, Mar 21 (doi:10.1038/nn1216). Martin -------------------------------- Martin Braun Neuroscience of Music S-671 95 Klässbol Sweden web site: http://w1.570.telia.com/~u57011259/index.htm


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