Subject: Rationale for Speech Tests From: Gaston Hilkhuysen <ghilkhuysen@xxxxxxxx> Date: Tue, 24 Apr 2012 14:48:46 +0000 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>--_dca03aef-5eca-44c9-848c-bec45a12e534_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Dear Enrique=2C =20 Thank you very much for your interesting question concerning d-primes in intelligibility measurements. Serious psychophysicist won=92t t= ake =91don=92t know=92 (DK) for an answer: to control for decision strategies they trouble= their subjects with n-AFC tasks. Researchers in speech perception seem less troub= led by such effects=2C and consider DK acceptable=2C particularly in tests with op= en response sets. At times I wonder how much of the intelligibility difference between (young) normal hearing and (elderly) hearing impaired can be explai= ned by differences in decision strategies. =20 Concerning the relation of SNR to d-prime=2C Jorgersen & Dau (JASA 2011) provide a formula that relates their SNR in the envelope do= main to d-prime. They refer to Egan (1965) and Egan et al. (1969) for studies re= lating the good old SNR in the audio domain to d-prime. I haven=92t checked these = refs=2C but it surely sounds like an interesting lead. If you happen to come across other studies=2C I would be delighted if you could share them with me. =20 Yours=2C =20 -Gaston. =20 lilia sola regvnt lvnam=2C vndas=2C castra=2C leonem = --_dca03aef-5eca-44c9-848c-bec45a12e534_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable <html> <head> <style><!-- .hmmessage P { margin:0px=3B padding:0px } body.hmmessage { font-size: 10pt=3B font-family:Tahoma } --></style></head> <body class=3D'hmmessage'><div dir=3D'ltr'> <!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <w:DontGrowAutofit/> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> </w:WordDocument> </xml><![endif]--><!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState=3D"false" LatentStyleCount=3D"156"> </w:LatentStyles> </xml><![endif]--><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"=3B mso-tstyle-rowband-size:0=3B mso-tstyle-colband-size:0=3B mso-style-noshow:yes=3B mso-style-parent:""=3B mso-padding-alt:0cm 5.4pt 0cm 5.4pt=3B mso-para-margin:0cm=3B mso-para-margin-bottom:.0001pt=3B mso-pagination:widow-orphan=3B font-size:10.0pt=3B font-family:"Times New Roman"=3B mso-ansi-language:#0400=3B mso-fareast-language:#0400=3B mso-bidi-language:#0400=3B} </style> <![endif]--> <p class=3D"MsoNormal">Dear Enrique=2C</p> <p class=3D"MsoNormal"> =3B</p> <p class=3D"MsoNormal">Thank you very much for your interesting question co= ncerning d-primes in intelligibility measurements. Serious psychophysicist won=92t t= ake =91don=92t know=92 (DK) for an answer: to control for decision strategies they trouble= their subjects with n-AFC tasks. Researchers in speech perception seem less troub= led by such effects=2C and consider DK acceptable=2C particularly in tests with op= en response sets. At times I wonder how much of the intelligibility difference between (young) normal hearing and (elderly) hearing impaired can be explai= ned by differences in decision strategies.</p> <p class=3D"MsoNormal"> =3B</p> <p class=3D"MsoNormal">Concerning the relation of SNR to d-prime=2C Jorgers= en &=3B Dau (JASA 2011) provide a formula that relates their SNR in the envelope do= main to d-prime. They refer to Egan (1965) and Egan et al. (1969) for studies re= lating the good old SNR in the audio domain to d-prime. I haven=92t checked these = refs=2C but it surely sounds like an interesting lead. If you happen to come across other studies=2C I would be delighted if you could share them with me.</p> <p class=3D"MsoNormal"> =3B</p> <p class=3D"MsoNormal">Yours=2C</p> <p class=3D"MsoNormal"> =3B</p> <p class=3D"MsoNormal">-Gaston. <span style=3D"mso-spacerun:yes"> =3B</= span></p> <br><br><font style=3D"" face=3D"Courier New">lilia sola regvnt lvnam=2C vn= das=2C castra=2C leonem<br></font> </div></body> </html>= --_dca03aef-5eca-44c9-848c-bec45a12e534_--