Re: quick and cheap setup for localization experiment (Piotr Majdak )


Subject: Re: quick and cheap setup for localization experiment
From:    Piotr Majdak  <piotr@xxxxxxxx>
Date:    Wed, 8 Jun 2011 11:35:10 +0200
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

This is a multi-part message in MIME format. --------------070106070908060803050503 Content-Type: multipart/alternative; boundary="------------060505090000030509010507" --------------060505090000030509010507 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by drizzle.cc.mcgill.ca id p589ZCp7027581 Dear Massimo, just some thoughts: 1) If the speech processor has an in-line input, using it would be more=20 comfortable for the listeners then using headphones. Also, the test=20 would be done in a more controlled way (better calibration, constant=20 coupling of the sound source and processor) 2) With one implant only, the localization performance in terms of an=20 externalization will be very, very limited. Even lateralization will be=20 limited - correct guessing the right side would be already a success. 3) Training and adaptations are important. Let the listeners use the=20 devices for at least few weeks and train them to the task. 4) For the hardware a simple surround sound interface (for 6=20 loudspeakers) or stereo interface (for headphones) is sufficient. You=20 could use some speakers placed at different positions in the room and=20 then run a loudspeaker identification task. 5) As in all CI test, expect huge variability - we use many repetitions=20 to reduce this problem. Good luck, Piotr Massimo Grassi wrote: > Dear all, > > I've been asked by a doctor of the local hospital to organize a set of=20 > psychoacoustical tests for two teenagers that will receive the=20 > cochlear implant the next month. > The idea is to test the auditory skills before and after the implant.=20 > (Note that the girls will receive the implant in one ear only at the=20 > beginning.) > > I was thinking also to get a measure of localization skills. And here=20 > come the questions: > 1) can a lateralization experiment (i.e., performed with headphones)=20 > be a reliable estimate of localization skills? > 2) does anybody have suggestions about a possible DIY, easy-to-build=20 > and cheap setup for a localization experiment? (pictures are welcome) > > Thank you all in advance, > m --=20 Piotr Majdak Psychoakustik und Experimentelle Audiologie Institut f=FCr Schallforschung <http://www.kfs.oeaw.ac.at> =D6sterreichische Akademie der Wissenschaften <http://www.oeaw.ac.at/> Wohllebengasse 12-14, 1040 Wien Tel.: +43 1 51581-2511 Fax: +43 1 51581-2530 --------------060505090000030509010507 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> Dear Massimo,<br> <br> just some thoughts:<br> 1) If the speech processor has an in-line input, using it would be more comfortable for the listeners then using headphones. Also, the test would be done in a more controlled way (better calibration, constant coupling of the sound source and processor)<br> 2) With one implant only, the localization performance in terms of an externalization will be very, very limited. Even lateralization will be limited - correct guessing the right side would be already a success. <br> 3) Training and adaptations are important. Let the listeners use the devices for at least few weeks and train them to the task.<br> 4) For the hardware a simple surround sound interface (for 6 loudspeakers) or stereo interface (for headphones) is sufficient. You could use some speakers placed at different positions in the room and then run a loudspeaker identification task.<br> 5) As in all CI test, expect huge variability - we use many repetitions to reduce this problem.<br> <br> Good luck,<br> <br> Piotr<br> <br> Massimo Grassi wrote: <blockquote cite="mid:5659_1307522919_4DEF3767_5659_83_1_4DEF35BF.7030001@xxxxxxxx" type="cite">Dear all, <br> <br> I've been asked by a doctor of the local hospital to organize a set of psychoacoustical tests for two teenagers that will receive the cochlear implant the next month. <br> The idea is to test the auditory skills before and after the implant. (Note that the girls will receive the implant in one ear only at the beginning.) <br> <br> I was thinking also to get a measure of localization skills. And here come the questions: <br> 1) can a lateralization experiment (i.e., performed with headphones) be a reliable estimate of localization skills? <br> 2) does anybody have suggestions about a possible DIY, easy-to-build and cheap setup for a localization experiment? (pictures are welcome) <br> <br> Thank you all in advance, <br> m <br> </blockquote> <br> <br> <div class="moz-signature">-- <br> Piotr Majdak<br> Psychoakustik und Experimentelle Audiologie<br> <a href="http://www.kfs.oeaw.ac.at">Institut f&uuml;r Schallforschung</a><br> <a href="http://www.oeaw.ac.at/">&Ouml;sterreichische Akademie der Wissenschaften</a><br> Wohllebengasse 12-14, 1040 Wien<br> Tel.: +43 1 51581-2511<br> Fax: +43 1 51581-2530</div> </body> </html> --------------060505090000030509010507-- --------------070106070908060803050503 Content-Type: text/x-vcard; charset=utf-8; name="piotr.vcf" Content-Disposition: attachment; filename="piotr.vcf" Content-Transfer-Encoding: 7bit begin:vcard fn:Piotr Majdak n:Majdak;Piotr org;quoted-printable;quoted-printable:=C3=96sterreichische Akademie der Wissenschaften;Institut f=C3=BCr Schallforschung adr;quoted-printable:;;Wohllebengasse 12-14;Wien;;1040;=C3=96sterreich email;internet:piotr@xxxxxxxx tel;work:+43-1-51581-2511 tel;fax:+43-1-51581-2530 tel;home:+43-1-2938-480 tel;cell:+43-699-8130-5070 url:www.kfs.oeaw.ac.at version:2.1 end:vcard --------------070106070908060803050503--


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