Subject: Re: [AUDITORY] How to speak to people about hearing loss and more From: Sarah Hargus Ferguson <sarah.ferguson@xxxxxxxx> Date: Wed, 16 Oct 2013 15:21:30 +0000 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>I teach the Cochlear Implants class at my university and so have occasion t= o stay "up" on this; 8 channels is still what typical CI users are getting.= Basically a CI is a string of electrodes floating in a electrolyte solutio= n, and so the current spread is significant no matter the number or spacing= of the electrodes or even how close to the modiolus the array is placed.=20 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Sarah Hargus Ferguson, Ph.D., CCC-A Assistant Professor Department of Communication Sciences and Disorders University of Utah -----Original Message----- From: AUDITORY - Research in Auditory Perception [mailto:AUDITORY@xxxxxxxx= ILL.CA] On Behalf Of Bob Masta Sent: Tuesday, October 15, 2013 6:11 AM To: AUDITORY@xxxxxxxx Subject: Re: How to speak to people about hearing loss and more On 14 Oct 2013 at 15:04, Kevin Austin wrote: >=20 > The new [sic] generation is in the middle of this "plague of silence". >=20 > Implants? >=20 > what do they sound like? >=20 > http://www.youtube.com/watch?v=3DSpKKYBkJ9Hw >=20 > http://www.youtube.com/watch?v=3D00WOao4kpwM >=20 > There may be examples of 128 and 256 channel reconstruction somewhere=20 > out there. Consider that 256 channels only yields about 1/3 semitone=20 > bandwidth, probably ok for speech and autotuned music. > http://www.youtube.com/watch?v=3DOvHmrShrmaM My understanding (which may be a few years out of date) is=20 that cochlear implants rarely get more than 8 or so useful=20 channels in actual patients, no matter how many channels=20 there are on the prosthesis itself. Partly this has to do=20 with insertion and positioning issues, but mostly it's due=20 to the fact that the closer the electrodes are spaced, the=20 closer they have to be to their targets in order to be=20 separately resolved... and you just can't get all that=20 close. =20 Best regards, Bob Masta =20 D A Q A R T A Data AcQuisition And Real-Time Analysis www.daqarta.com Scope, Spectrum, Spectrogram, Signal Generator Science with your sound card!