Subject: Re: ear canal length From: Brad Ingrao <info(at)bradingrao.com> Date: Tue, 9 Mar 2004 15:06:38 -0500David, I don't have any specific papers to cite, but a few comments While not a direct measure of ear canal length, there is a lot of data on the resonance of the ear canal as measured via a probe microphone system. This Real Ear Unaided Response (REUR) clearly shows smaller ears have higher frequency REUR peaks. Richard Seewald's group has a lot of REUR data on very young children. http://www.uwo.ca/nca/about.htm If you look at tympanometry one of the measures reported is ear canal volume. Again, not a direct measure of length, but related. Finally, a group at Massachusetts Eye and Ear Infirmary was doing some work with laser measurements of Tympanic Membrane movement and may have some data on ear canal length. ____________________________________________ Best Regards, Brad Ingrao, M.S.Ed. CCC-A, FAAA Editor EDEN - The Electronic Deaf Education Network www.bradingrao.com e-mail: info(at)bradingrao.com -----Original Message----- From: AUDITORY Research in Auditory Perception [mailto:AUDITORY(at)LISTS.MCGILL.CA] On Behalf Of David Schwartz Sent: Tuesday, March 09, 2004 11:16 AM To: AUDITORY(at)LISTS.MCGILL.CA Subject: ear canal length Greetings. Can anyone direct me to published data on age-related differences in human ear canal length? My intuition is that ear canal length scales with overall head size and thus that infants have shorter canal length than adults, but I'd like to see the actual numbers. Any help greatly appreciated. Many thanks. David