Subject: Re: [AUDITORY] Sensitivity to ITDs with mismatched frequencies in each ear? From: "Bernstein,Leslie" <lbernstein@xxxxxxxx> Date: Wed, 24 Feb 2021 14:01:14 +0000--_004_ccb250664edc4637b00c6f13cf8f2033NSOITEXCMB21uchcnet_ Content-Type: multipart/alternative; boundary="_000_ccb250664edc4637b00c6f13cf8f2033NSOITEXCMB21uchcnet_" --_000_ccb250664edc4637b00c6f13cf8f2033NSOITEXCMB21uchcnet_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Jan- Yes, it is true that if you mismatch low frequencies you can produce binaur= al beats. The same is true for high-frequency envelopes (see papers by McF= adden and Bernstein and Trahiotis). The limits of binaural beats, in terms= of delta-F, do not directly reveal the nature of the loss of binaural mism= atch. Nuetzel and Hafter published an early paper regarding carrier mismat= ch and ITD thresholds. I'd be happy to discuss all of this with you via ph= one or email. As for mismatched CI electrodes, a case in which a common CF is delivered t= o different places, I suggest you contact Justin Aronoff (jaronoff@xxxxxxxx= .edu<mailto:jaronoff@xxxxxxxx>) at the University of Illinois. Tell hi= m I sent you! Take care. Les -- Leslie R. Bernstein, Ph.D. | Professor Depts. of Neuroscience and Surgery (Otolaryngology) | UConn School of Medic= ine 263 Farmington Avenue, Farmington, CT 06030-3401 Office: 860.679.4622 | Fax: 860.679.2495 [cid:part1.65E9CBD4.D6FC3EF6@xxxxxxxx On 2/24/2021 5:47 AM, Jan Schnupp wrote: *** Attention: This is an external email. Use caution responding, opening a= ttachments or clicking on links. *** Dear List, I am curious if you could recommend some reading for me. We have been incre= asingly interested in ITD coding with cochlear implants and have developed = a nice little animal model which shows a surprisingly robust behavioral ITD= sensitivity even if deafened in infancy and only implanted in young adulth= ood. One question we often get and which we would like to investigate is: how mu= ch does it matter if there is a bit of a mismatch between the frequency cha= nnels in the left and right ears? How badly do they have to be mismatched b= efore ITD sensitivity disappears? I kind of assumed that there must have been a lot of psychoacoustics on thi= s, at least in normally hearing human subjects. Of course at low frequencie= s, if you mismatch the left and right ears you get binaural beats, but what= about envelope ITDs? You could deliver for example trains of short gabor c= licks to each ear with a greater or lesser extent of carrier frequency mism= atch, and see how the mismatch affects ITD thresholds. It seems like such a= n obvious thing to try, surely somebody must have done this or something si= milar? But a quick look on google scholar didn't yield very much. A modelli= ng paper by Bonham and Lewis 1999 was the top hit. I haven't seen much in t= he way of data. Surely I must be missing something...? Any suggestions for = relevant reading gratefully accepted. Best wishes, Jan --------------------------------------- Prof Jan Schnupp City University of Hong Kong Dept. of Neuroscience 31 To Yuen Street, Kowloon Tong Hong Kong https://auditoryneuroscience.com<https://urldefense.com/v3/__https://audito= ryneuroscience.com__;!!N0rdg9Wr!_6_WVMAsvge7VPci34_xfTiiZi8ibJOsGOrPF24Edav= bZRyQ3BVinK7C96DrE2IG6Q$> http://jan.schnupp.net<https://urldefense.com/v3/__http://jan.schnupp.net__= ;!!N0rdg9Wr!_6_WVMAsvge7VPci34_xfTiiZi8ibJOsGOrPF24EdavbZRyQ3BVinK7C96AqPFJ= FDA$> --_000_ccb250664edc4637b00c6f13cf8f2033NSOITEXCMB21uchcnet_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <html> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"= > </head> <body> <font face=3D"Verdana">Jan-<br> <br> Yes, it is true that if you mismatch low <i><b>frequencies</b></i> you can = produce binaural beats. The same is true for high-frequency envelopes= (see papers by McFadden and Bernstein and Trahiotis). The limits of = binaural beats, in terms of delta-F, do not directly reveal the nature of the loss of binaural mismatch. Nuetzel= and Hafter published an early paper regarding carrier mismatch and ITD thr= esholds. I'd be happy to discuss all of this with you via phone or em= ail.<br> <br> As for mismatched CI electrodes, a case in which a common CF is delivered t= o different places, </font><font face=3D"Verdana"><font face=3D"Verdana">I suggest you contact = Justin Aronoff (<a class=3D"moz-txt-link-abbreviated" href=3D"mailto:jarono= ff@xxxxxxxx">jaronoff@xxxxxxxx</a>) at the University of Illinois.&= nbsp; Tell him I sent you!</font><br> <br> Take care.<br> <br> Les</font><br> <font face=3D"Verdana">-- <br> <b><span style=3D"font-size:10.0pt;font-family:"Arial",sans-serif= ;=0A= mso-fareast-font-family:"Times New Roman=0A= \;color\:\#002048"">Leslie R. Bernstein, Ph.D. </span></b><b><span style=3D"font-size:10.0pt;font-family:"Arial"= ,sans-serif;=0A= mso-fareast-font-family:"Times New Roman=0A= \;color\:\#585858"">| </span></b><span style=3D"font-size:10.0pt;font-family:"Arial",sa= ns-serif;mso-fareast-font-family:"Times=0A= New Roman \;color\:\#585858"">Professor</span><span style=3D"m= so-fareast-font-family: "Times New Roman""></span><span style=3D"= font-size:10.0pt;font-family:"Arial",sans-serif;=0A= mso-fareast-font-family:"Times New Roman=0A= \;color\:\#585858""><br> Depts. of Neuroscience and Surgery (Otolaryngology) | UConn School of Medic= ine </span> <br> <span style=3D"font-size:10.0pt;font-family:"Arial",sans-serif;= =0A= mso-fareast-font-family:"Times New Roman=0A= \;color\:\#585858""></span><span style=3D"font-size:10.0pt;fon= t-family:"Arial",sans-serif;=0A= mso-fareast-font-family:"Times New Roman=0A= \;color\:\#585858"">263 Farmington Avenue, Farmington, CT 06030-3401</span><br> <span style=3D"font-size:10.0pt;font-family:"Arial",sans-serif;= =0A= mso-fareast-font-family:"Times New Roman=0A= \;color\:\#585858""></span><span style=3D"font-size:10.0pt;fon= t-family:"Arial",sans-serif;=0A= mso-fareast-font-family:"Times New Roman=0A= \;color\:\#585858"">Office: 860.679.4622 | Fax: 860.679.2495<br> <br> <img alt=3D"" src=3D"cid:part1.65E9CBD4.D6FC3EF6@xxxxxxxx" width=3D"125" he= ight=3D"48"></span></font> <div class=3D"moz-cite-prefix"><br> <br> On 2/24/2021 5:47 AM, Jan Schnupp wrote:<br> </div> <blockquote type=3D"cite" cite=3D"mid:CAJptJs5UFaSwbH=3DxZKZRoVX5H1CJVpSc5k= oWuwTqajLp-jZ_fQ@xxxxxxxx"> <div style=3D"background-color:#D5EAFF; padding:.8em; "> <div style=3D"font-size:12pt; color:#ff0000; text-align: center;=0A= font-family: 'Calibri',sans-serif;"> *** Attention: This is an external email. Use caution responding, opening a= ttachments or clicking on links. ***</div> </div> <div> <div dir=3D"ltr">Dear List, <div><br> </div> <div>I am curious if you could recommend some reading for me. We have been = increasingly interested in ITD coding with cochlear implants and have devel= oped a nice little animal model which shows a surprisingly robust behaviora= l ITD sensitivity even if deafened in infancy and only implanted in young adulthood. </div> <div>One question we often get and which we would like to investigate is: h= ow much does it matter if there is a bit of a mismatch between the frequenc= y channels in the left and right ears? How badly do they have to be mismatc= hed before ITD sensitivity disappears?</div> <div>I kind of assumed that there must have been a lot of psychoacoustics o= n this, at least in normally hearing human subjects. Of course at low frequ= encies, if you mismatch the left and right ears you get binaural beats, but= what about envelope ITDs? You could deliver for example trains of short gabor clicks to each ear with a greate= r or lesser extent of carrier frequency mismatch, and see how the mism= atch affects ITD thresholds. It seems like such an obvious thing to try, su= rely somebody must have done this or something similar? But a quick look on google scholar didn't yield very mu= ch. A modelling paper by Bonham and Lewis 1999 was the top hit. I haven't s= een much in the way of data. Surely I must be missing something...? Any sug= gestions for relevant reading gratefully accepted. </div> <div><br> </div> <div>Best wishes,</div> <div><br> </div> <div>Jan</div> <div><br clear=3D"all"> <div> <div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_signatur= e"> <div dir=3D"ltr"> <div> <div dir=3D"ltr"> <div> <div dir=3D"ltr"> <div dir=3D"ltr"> <div dir=3D"ltr"> <div dir=3D"ltr"> <div style=3D"font-size:12.8px"><br> </div> <div style=3D"font-size:12.8px">---------------------------------------</di= v> <div style=3D"font-size:12.8px">Prof Jan Schnupp<br> City University of Hong Kong<br> Dept. of Neuroscience</div> <div> <div style=3D"font-size:12.8px">31 To Yuen Street, </div> <div style=3D"font-size:12.8px"><span style=3D"font-size:12.8px">Kowloon To= ng</span></div> <div style=3D"font-size:12.8px">Hong Kong</div> <div style=3D"font-size:12.8px"><br> </div> <a href=3D"https://urldefense.com/v3/__https://auditoryneuroscience.com__;!= !N0rdg9Wr!_6_WVMAsvge7VPci34_xfTiiZi8ibJOsGOrPF24EdavbZRyQ3BVinK7C96DrE2IG6= Q$" target=3D"_blank" moz-do-not-send=3D"true">https://auditoryneuroscience= .com</a></div> <div><a href=3D"https://urldefense.com/v3/__http://jan.schnupp.net__;!!N0rd= g9Wr!_6_WVMAsvge7VPci34_xfTiiZi8ibJOsGOrPF24EdavbZRyQ3BVinK7C96AqPFJFDA$" t= arget=3D"_blank" moz-do-not-send=3D"true">http://jan.schnupp.net</a></div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </blockquote> <br> <br> <div class=3D"moz-signature"><span style=3D"font-size:10.0pt;font-family:&q= uot;Arial",sans-serif;=0A= mso-fareast-font-family:"Times New Roman=0A= \;color\:\#585858""><br> </span></div> </body> </html> --_000_ccb250664edc4637b00c6f13cf8f2033NSOITEXCMB21uchcnet_-- --_004_ccb250664edc4637b00c6f13cf8f2033NSOITEXCMB21uchcnet_ Content-Type: image/png; name="uconnhealth_stacked_blue_email.png" Content-Description: uconnhealth_stacked_blue_email.png Content-Disposition: inline; filename="uconnhealth_stacked_blue_email.png"; size=796; creation-date="Wed, 24 Feb 2021 14:01:14 GMT"; modification-date="Wed, 24 Feb 2021 14:01:14 GMT" Content-ID: <part1.65E9CBD4.D6FC3EF6@xxxxxxxx> Content-Transfer-Encoding: base64 iVBORw0KGgoAAAANSUhEUgAAAH0AAAAwCAMAAAALmIWlAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJ bWFnZVJlYWR5ccllPAAAADNQTFRFKzVYHCZM4eLn8PHzpKi30dTbaG+IlZqrs7fDWWB8O0Nkd32U wsXPSlJwhoufDRhA////A68jmAAAABF0Uk5T/////////////////////wAlrZliAAACYklEQVR4 2uzY22KDIAwAUC7e6gjw/187gUC4OetaupflaTXKWSuBKNMuJptC+QMCP20auPHBQCubBWU46K24 uB7NfZ58ZqaMP8D8AEBHtT/goXnB8WPwBf8r1WYUXWxUOZobHcJXIMcfONclmE4s0lrRzYBIOjvT jX5WV6YbP2ZQJ6TWjfiAbuYzHW7p+xpuolQrP83sjQ5nupnu6LqaJ92MbnSznulcfkBHpNXNY6y+ c0JKnWX1eFeflQt5qcNESKnrQMrf6LSAXeiWkEoXdOU4nZBKxzPnoTohtW5ZZyK8W09Io6tYjyP1 iDS6XbAeh815S0irS6zHUfXuB0Ok1S3W41AdEWh1/Nb7UD1bWytd0LY4ThdnerYbBJ1taT5XBmy4 J8mNnWagp5fbba6HeiTdneK6vNgoFj0EhyO4eSZT6AlpdNXoNzqYi94GbIU0eqhHp3d5drRf4heZ Uo9Iq8vYptup6VB37H6m/W6m0hFpdaxH3/yK9cHpVq5Zy59n2GMV/QxPGdV9NElPE9njyOozsfWW Kq6j7bLuw97KPBnM/mX86//6n+tH/yLKP7AUXcyd80Lx53WnspB47ty5qKND1gLockfIFzHR7srp Q7X0+6GgHPNFXedPyaN1CPFli71z+ZBeTxbcI2RXxwOQj/lW/Ui610Z6gA4a32WRrssXYbO76V/Z y6FLnZVj/qCnqGcdZE1DeFKcntWrMV/RZXCh7B/fpF/+8tQQx6J74y9/Oeuyrm75+Jyf8oKWH9CL 1SYNJtJ91HTOAD2fdjPN9UcsumwmDNYXqvPtOLa9pH8LMACnoV0siZAyOAAAAABJRU5ErkJggg== --_004_ccb250664edc4637b00c6f13cf8f2033NSOITEXCMB21uchcnet_--