Subject: [AUDITORY] Sensitivity to ITDs with mismatched frequencies in each ear? From: Jan Schnupp <000000e042a1ec30-dmarc-request@xxxxxxxx> Date: Wed, 24 Feb 2021 17:45:41 +0800--000000000000ce69d905bc11efc0 Content-Type: text/plain; charset="UTF-8" Dear List, I am curious if you could recommend some reading for me. We have been increasingly 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 adulthood. One question we often get and which we would like to investigate is: how much does it matter if there is a bit of a mismatch between the frequency channels in the left and right ears? How badly do they have to be mismatched before ITD sensitivity disappears? I kind of assumed that there must have been a lot of psychoacoustics on this, at least in normally hearing human subjects. Of course at low frequencies, 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 greater or lesser extent of carrier frequency mismatch, and see how the mismatch affects ITD thresholds. It seems like such an obvious thing to try, surely somebody must have done this or something similar? But a quick look on google scholar didn't yield very much. A modelling paper by Bonham and Lewis 1999 was the top hit. I haven't seen much in the 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 http://jan.schnupp.net --000000000000ce69d905bc11efc0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr">Dear List,<div><br></div><div>I am curious if you could re= commend some reading for me. We have been increasingly interested in ITD co= ding with cochlear implants and have developed a nice little animal model w= hich shows a surprisingly robust behavioral ITD sensitivity even if deafene= d in infancy and only implanted in young adulthood.=C2=A0</div><div>One que= stion we often get and which we would like to investigate is: how much does= it matter if there is a bit of a mismatch between the frequency channels i= n the left and right ears? How badly do they have to be mismatched before I= TD sensitivity disappears?</div><div>I kind of assumed that there must have= been a lot of psychoacoustics on this, at least in normally hearing human = subjects. Of course at low frequencies, if you mismatch the left and right = ears you get binaural beats, but what about envelope ITDs?=C2=A0You could d= eliver for example trains of short gabor clicks to each ear with a greater = or lesser extent of carrier frequency mismatch, and see how the=C2=A0mismat= ch affects ITD thresholds. It seems like such an obvious thing to try, sure= ly somebody must have done this or something similar? But a quick look on g= oogle scholar didn't yield very much. A modelling paper by Bonham and L= ewis 1999 was the top hit. I haven't seen much in the way of data. Sure= ly I must be missing something...? Any suggestions for relevant reading gra= tefully=C2=A0accepted.=C2=A0</div><div><br></div><div>Best wishes,</div><di= v><br></div><div>Jan</div><div><br clear=3D"all"><div><div dir=3D"ltr" clas= s=3D"gmail_signature" data-smartmail=3D"gmail_signature"><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">---------------------------------------</div><div style= =3D"font-size:12.8px">Prof Jan Schnupp<br>City University of Hong Kong<br>D= ept. of Neuroscience</div><div><div style=3D"font-size:12.8px">31 To Yuen S= treet,=C2=A0</div><div style=3D"font-size:12.8px"><span style=3D"font-size:= 12.8px">Kowloon Tong</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://auditoryn= euroscience.com" target=3D"_blank">https://auditoryneuroscience.com</a></di= v><div><a href=3D"http://jan.schnupp.net" target=3D"_blank">http://jan.schn= upp.net</a></div></div></div></div></div></div></div></div></div></div></di= v></div></div> --000000000000ce69d905bc11efc0--