Subject: Re: [AUDITORY] Sensitivity to ITDs with mismatched frequencies in each ear? From: Chris Stecker <cstecker@xxxxxxxx> Date: Wed, 24 Feb 2021 13:27:13 -0600--Apple-Mail=_C5F51321-7BE2-4E37-A615-6DB5481C49E0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Yes, it sure does seem like someone would have tested that by now.=20 1=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2= =80=94=E2=80=94=E2=80=94=E2=80=94 Blanks DA, Buss E, Grose JH, Fitzpatrick DC, Hall JW 3rd. Interaural = time discrimination of envelopes carried on high-frequency tones as a = function of level and interaural carrier mismatch. Ear Hear. = 2008;29(5):674-683. doi:10.1097/AUD.0b013e3181775e03 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2648125/ 2=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2= =80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94 Goupell MJ, Stoelb C, Kan A, Litovsky RY. Effect of mismatched = place-of-stimulation on the salience of binaural cues in conditions that = simulate bilateral cochlear-implant listening. J Acoust Soc Am. = 2013;133(4):2272-2287. doi:10.1121/1.4792936 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3631247/ 3=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2= =80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80= =94=E2=80=94=E2=80=94=E2=80=94 Kan A, Litovsky RY, Goupell MJ. Effects of interaural pitch matching and = auditory image centering on binaural sensitivity in cochlear implant = users. Ear Hear. 2015;36(3):e62-e68. doi:10.1097/AUD.0000000000000135 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4409917/ -Chris :-) > On Feb 24, 2021, at 3:45 AM, Jan Schnupp = <000000e042a1ec30-dmarc-request@xxxxxxxx> wrote: >=20 > Dear List, >=20 > 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.=20 > 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.=20 >=20 > Best wishes, >=20 > Jan >=20 >=20 > --------------------------------------- > Prof Jan Schnupp > City University of Hong Kong > Dept. of Neuroscience > 31 To Yuen Street,=20 > Kowloon Tong > Hong Kong >=20 > https://auditoryneuroscience.com <https://auditoryneuroscience.com/> > http://jan.schnupp.net <http://jan.schnupp.net/> --Apple-Mail=_C5F51321-7BE2-4E37-A615-6DB5481C49E0 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 <html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; = charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; = -webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><div = class=3D"">Yes, it sure does seem like someone would have tested that by = now. </div><div class=3D""><br class=3D""></div><div class=3D""><span= style=3D"caret-color: rgb(48, 48, 48); color: rgb(48, 48, 48); = font-family: arial, helvetica, clean, sans-serif; font-size: 13px; = background-color: rgb(255, 255, 255);" class=3D"">1</span><font = color=3D"#303030" face=3D"arial, helvetica, clean, sans-serif" size=3D"2" = class=3D""><span style=3D"caret-color: rgb(48, 48, 48);" = class=3D"">=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94= =E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94</span></font></div><div = class=3D""><span style=3D"caret-color: rgb(48, 48, 48); color: rgb(48, = 48, 48); font-family: arial, helvetica, clean, sans-serif; font-size: = 13px; background-color: rgb(255, 255, 255);" class=3D"">Blanks DA, Buss = E, Grose JH, Fitzpatrick DC, Hall JW 3rd. Interaural time discrimination = of envelopes carried on high-frequency tones as a function of level and = interaural carrier mismatch. </span><i style=3D"caret-color: = rgb(48, 48, 48); color: rgb(48, 48, 48); font-family: arial, helvetica, = clean, sans-serif; font-size: 13px;" class=3D"">Ear Hear</i><span = style=3D"caret-color: rgb(48, 48, 48); color: rgb(48, 48, 48); = font-family: arial, helvetica, clean, sans-serif; font-size: 13px; = background-color: rgb(255, 255, 255);" class=3D"">. 2008;29(5):674-683. = doi:10.1097/AUD.0b013e3181775e03</span></div><div class=3D""><span = style=3D"caret-color: rgb(48, 48, 48); color: rgb(48, 48, 48); = font-family: arial, helvetica, clean, sans-serif; font-size: 13px; = background-color: rgb(255, 255, 255);" class=3D""><br = class=3D""></span></div><a = href=3D"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2648125/" = class=3D"">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2648125/</a><br = class=3D""><div><br class=3D""></div><div><br = class=3D""></div><div>2=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80= =94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94= =E2=80=94</div><div><br class=3D""></div><div><span style=3D"caret-color: = rgb(48, 48, 48); color: rgb(48, 48, 48); font-family: arial, helvetica, = clean, sans-serif; font-size: 13px; background-color: rgb(255, 255, = 255);" class=3D"">Goupell MJ, Stoelb C, Kan A, Litovsky RY. Effect of = mismatched place-of-stimulation on the salience of binaural cues in = conditions that simulate bilateral cochlear-implant = listening. </span><i style=3D"caret-color: rgb(48, 48, 48); color: = rgb(48, 48, 48); font-family: arial, helvetica, clean, sans-serif; = font-size: 13px;" class=3D"">J Acoust Soc Am</i><span = style=3D"caret-color: rgb(48, 48, 48); color: rgb(48, 48, 48); = font-family: arial, helvetica, clean, sans-serif; font-size: 13px; = background-color: rgb(255, 255, 255);" class=3D"">. = 2013;133(4):2272-2287. doi:10.1121/1.4792936</span></div><div><span = style=3D"caret-color: rgb(48, 48, 48); color: rgb(48, 48, 48); = font-family: arial, helvetica, clean, sans-serif; font-size: 13px; = background-color: rgb(255, 255, 255);" class=3D""><br = class=3D""></span></div><div>https://www.ncbi.nlm.nih.gov/pmc/articles/PMC= 3631247/</div><div><br class=3D""></div><div><br class=3D""></div><div><br= = class=3D""></div><div>3=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80= =94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94= =E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94</div><div><br = class=3D""></div><div><span style=3D"caret-color: rgb(48, 48, 48); = color: rgb(48, 48, 48); font-family: arial, helvetica, clean, = sans-serif; font-size: 13px; background-color: rgb(255, 255, 255);" = class=3D"">Kan A, Litovsky RY, Goupell MJ. Effects of interaural pitch = matching and auditory image centering on binaural sensitivity in = cochlear implant users. </span><i style=3D"caret-color: rgb(48, 48, = 48); color: rgb(48, 48, 48); font-family: arial, helvetica, clean, = sans-serif; font-size: 13px;" class=3D"">Ear Hear</i><span = style=3D"caret-color: rgb(48, 48, 48); color: rgb(48, 48, 48); = font-family: arial, helvetica, clean, sans-serif; font-size: 13px; = background-color: rgb(255, 255, 255);" class=3D"">. 2015;36(3):e62-e68. = doi:10.1097/AUD.0000000000000135</span></div><div><span = style=3D"caret-color: rgb(48, 48, 48); color: rgb(48, 48, 48); = font-family: arial, helvetica, clean, sans-serif; font-size: 13px; = background-color: rgb(255, 255, 255);" class=3D""><br = class=3D""></span></div><div><span style=3D"background-color: rgb(255, = 255, 255); caret-color: rgb(48, 48, 48);" class=3D""><font = color=3D"#303030" face=3D"arial, helvetica, clean, sans-serif" size=3D"2" = class=3D"">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4409917/</font></s= pan></div><div><span style=3D"background-color: rgb(255, 255, 255); = caret-color: rgb(48, 48, 48);" class=3D""><font color=3D"#303030" = face=3D"arial, helvetica, clean, sans-serif" size=3D"2" class=3D""><br = class=3D""></font></span></div><div><span style=3D"background-color: = rgb(255, 255, 255); caret-color: rgb(48, 48, 48);" class=3D""><font = color=3D"#303030" face=3D"arial, helvetica, clean, sans-serif" size=3D"2" = class=3D""><br class=3D""></font></span></div><div><span = style=3D"background-color: rgb(255, 255, 255); caret-color: rgb(48, 48, = 48);" class=3D""><font color=3D"#303030" face=3D"arial, helvetica, = clean, sans-serif" size=3D"2" = class=3D"">-Chris</font></span></div><div><span style=3D"background-color:= rgb(255, 255, 255); caret-color: rgb(48, 48, 48);" class=3D""><font = color=3D"#303030" face=3D"arial, helvetica, clean, sans-serif" size=3D"2" = class=3D""><br class=3D""></font></span></div><div><span = style=3D"background-color: rgb(255, 255, 255); caret-color: rgb(48, 48, = 48);" class=3D""><font color=3D"#303030" face=3D"arial, helvetica, = clean, sans-serif" size=3D"2" class=3D""><br = class=3D""></font></span></div><div>:-)</div><div><br = class=3D""></div><div><br class=3D""></div><div><br class=3D""><blockquote= type=3D"cite" class=3D""><div class=3D"">On Feb 24, 2021, at 3:45 AM, = Jan Schnupp <000000e042a1ec30-dmarc-request@xxxxxxxx> = wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div = dir=3D"ltr" class=3D"">Dear List,<div class=3D""><br class=3D""></div><div= class=3D"">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. </div><div class=3D"">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?</div><div class=3D"">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. </div><div class=3D""><br = class=3D""></div><div class=3D"">Best wishes,</div><div class=3D""><br = class=3D""></div><div class=3D"">Jan</div><div class=3D""><br = clear=3D"all" class=3D""><div class=3D""><div dir=3D"ltr" = class=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div = dir=3D"ltr" class=3D""><div class=3D""><div dir=3D"ltr" class=3D""><div = class=3D""><div dir=3D"ltr" class=3D""><div dir=3D"ltr" class=3D""><div = dir=3D"ltr" class=3D""><div dir=3D"ltr" class=3D""><div = style=3D"font-size:12.8px" class=3D""><br class=3D""></div><div = style=3D"font-size:12.8px" = class=3D"">---------------------------------------</div><div = style=3D"font-size:12.8px" class=3D"">Prof Jan Schnupp<br class=3D"">City = University of Hong Kong<br class=3D"">Dept. of Neuroscience</div><div = class=3D""><div style=3D"font-size:12.8px" class=3D"">31 To Yuen = Street, </div><div style=3D"font-size:12.8px" class=3D""><span = style=3D"font-size:12.8px" class=3D"">Kowloon Tong</span></div><div = style=3D"font-size:12.8px" class=3D"">Hong Kong</div><div = style=3D"font-size:12.8px" class=3D""><br class=3D""></div><a = href=3D"https://auditoryneuroscience.com/" target=3D"_blank" = class=3D"">https://auditoryneuroscience.com</a></div><div class=3D""><a = href=3D"http://jan.schnupp.net/" target=3D"_blank" = class=3D"">http://jan.schnupp.net</a></div></div></div></div></div></div><= /div></div></div></div></div></div></div> </div></blockquote></div><br class=3D""></body></html>= --Apple-Mail=_C5F51321-7BE2-4E37-A615-6DB5481C49E0--