Re: [AUDITORY] Question about criterion in 2AFC designs. ("Gallun, Frederick J. (Portland)" )


Subject: Re: [AUDITORY] Question about criterion in 2AFC designs.
From:    "Gallun, Frederick J. (Portland)"  <Frederick.Gallun@xxxxxxxx>
Date:    Mon, 16 Sep 2013 18:31:21 -0700
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

------_=_NextPart_001_01CEB345.9DA745F1 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable "For measuring response bias [in the 2AFC task], the methods [for the YN task] are entirely adequate. No sqrt(2) adjustment is necessary, because (as the reader may not be surprised to learn) bias in one task cannot be predicted from bias in the other."=20 Macmillan and Creelman, Detection Theory: A User's Guide, 2nd Edition, p. 170. =20 ------------------------------------------------------- Frederick (Erick) Gallun, PhD=20 Research Investigator, NCRAR Associate Professor, Dept. of Otolaryngology, Oregon Health & Science University National Center for Rehabilitative Auditory Research=20 Portland VA Medical Center 3710 SW US Veterans Hospital Road (NCRAR) Portland, Oregon 97239 Tel: 503-220-8262 x57472=20 Fax: 503-721-1402 http://www.ncrar.research.va.gov/AboutUs/Staff/Gallun.asp <http://www.ncrar.research.va.gov/AboutUs/Staff/Gallun.asp>=20 This document is intended for the exclusive use of the recipient(s) named above. It may contain sensitive information that is protected, privileged, or confidential, and should not be disseminated, distributed, or copied to persons not authorized to receive such information. Unless otherwise noted, this communication represents the views of the sender and not necessarily those of the VA or NCRAR. If you are not the intended recipient or feel you have received this document in error, please notify the sender immediately and destroy the original. =20 From: AUDITORY - Research in Auditory Perception [mailto:AUDITORY@xxxxxxxx On Behalf Of Sam Mathias Sent: Sunday, September 15, 2013 6:57 AM To: AUDITORY@xxxxxxxx Subject: Question about criterion in 2AFC designs. =20 Dear list, =20 I think I know the answer to this question, but I'd rather be totally sure. When calculating sensitivity (d') in a 2AFC experiment, one needs to apply the sqrt(2) correction to the standard YN equation. My question is whether the same correction needs to be applied when calculating the criterion (c) in 2AFC. =20 Many thanks, =20 --=20 Dr. Samuel R. Mathias Center for Computational Neuroscience and Neural Technology Boston University 677 Beacon St., Boston, MA 02215 =20 =20 =20 ------_=_NextPart_001_01CEB345.9DA745F1 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" = xmlns:o=3D"urn:schemas-microsoft-com:office:office" = xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" = xmlns=3D"http://www.w3.org/TR/REC-html40"><head><meta = http-equiv=3DContent-Type content=3D"text/html; = charset=3Dus-ascii"><meta name=3DGenerator content=3D"Microsoft Word 14 = (filtered medium)"><style><!-- /* Font Definitions */ @xxxxxxxx {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4;} @xxxxxxxx {font-family:Tahoma; panose-1:2 11 6 4 3 5 4 4 2 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0in; margin-bottom:.0001pt; font-size:12.0pt; font-family:"Times New Roman","serif";} a:link, span.MsoHyperlink {mso-style-priority:99; color:blue; text-decoration:underline;} a:visited, span.MsoHyperlinkFollowed {mso-style-priority:99; color:purple; text-decoration:underline;} span.EmailStyle17 {mso-style-type:personal-reply; font-family:"Calibri","sans-serif"; color:#1F497D;} .MsoChpDefault {mso-style-type:export-only; font-family:"Calibri","sans-serif";} @xxxxxxxx WordSection1 {size:8.5in 11.0in; margin:1.0in 1.0in 1.0in 1.0in;} div.WordSection1 {page:WordSection1;} --></style><!--[if gte mso 9]><xml> <o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" /> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext=3D"edit"> <o:idmap v:ext=3D"edit" data=3D"1" /> </o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue = vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span = style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'> &#8220;For measuring response bias [in the 2AFC task], the methods = [for the YN task] are entirely adequate. No sqrt(2) adjustment is = necessary, because (as the reader may not be surprised to learn) bias in = one task cannot be predicted from bias in the other.&#8221; = <o:p></o:p></span></p><p class=3DMsoNormal><span = style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'>Macmillan and Creelman, Detection Theory: A User&#8217;s Guide, = 2<sup>nd</sup> Edition, p. 170.<o:p></o:p></span></p><p = class=3DMsoNormal><span = style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal = style=3D'mso-margin-top-alt:5.0pt;margin-right:0in;margin-bottom:5.0pt;ma= rgin-left:0in;text-autospace:none'><span = style=3D'font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'>-------------------------------------------------------<o:p></o:p></sp= an></p><p class=3DMsoNormal style=3D'text-autospace:none'><span = style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'>Frederick (Erick) Gallun, PhD <br>Research Investigator, = NCRAR<o:p></o:p></span></p><p class=3DMsoNormal = style=3D'text-autospace:none'><span = style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'>Associate Professor, Dept. of Otolaryngology, Oregon Health &amp; = Science University<o:p></o:p></span></p><p class=3DMsoNormal = style=3D'margin-top:6.0pt;text-autospace:none'><span = style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'>National Center for Rehabilitative Auditory Research <br>Portland VA = Medical Center</span><span = style=3D'font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'><br>3710 SW US Veterans Hospital Road (NCRAR)<br>Portland, Oregon = 97239<b><br>Tel:</b>&nbsp; 503-220-8262 x57472 <o:p></o:p></span></p><p = class=3DMsoNormal style=3D'text-autospace:none'><span = style=3D'font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'>Fax: 503-721-1402<o:p></o:p></span></p><p class=3DMsoNormal = style=3D'text-autospace:none'><span = style=3D'font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'><a = href=3D"http://www.ncrar.research.va.gov/AboutUs/Staff/Gallun.asp"><span = style=3D'color:blue'>http://www.ncrar.research.va.gov/AboutUs/Staff/Gallu= n.asp</span></a><o:p></o:p></span></p><p class=3DMsoNormal = style=3D'mso-margin-top-alt:5.0pt;margin-right:0in;margin-bottom:5.0pt;ma= rgin-left:0in;text-autospace:none'><span = style=3D'font-size:7.5pt;font-family:"Calibri","sans-serif";color:navy'>T= his document is intended for the exclusive use of the recipient(s) named = above.&nbsp; It may contain sensitive information that is protected, = privileged, or confidential, and should not be disseminated, = distributed, or copied to persons not authorized to receive such = information.&nbsp; Unless otherwise noted, this communication represents = the views of the sender and not necessarily those of the VA or = NCRAR.&nbsp; If you are not the intended recipient or feel you have = received this document in error, please notify the sender immediately = and destroy the original.</span><span = style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'><o:p></o:p></span></p><p class=3DMsoNormal><span = style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><b><span = style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>= </b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> = AUDITORY - Research in Auditory Perception = [mailto:AUDITORY@xxxxxxxx <b>On Behalf Of </b>Sam = Mathias<br><b>Sent:</b> Sunday, September 15, 2013 6:57 AM<br><b>To:</b> = AUDITORY@xxxxxxxx<br><b>Subject:</b> Question about criterion in = 2AFC designs.<o:p></o:p></span></p><p = class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><p class=3DMsoNormal>Dear = list,<o:p></o:p></p><div><p = class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>I = think I know the answer to this question, but I'd rather be totally = sure. When calculating sensitivity (d') in a 2AFC experiment, one needs = to apply the sqrt(2) correction to the standard YN equation. My question = is whether the same correction needs to be applied when calculating the = criterion (c) in 2AFC.<o:p></o:p></p></div><div><p = class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p = class=3DMsoNormal>Many thanks,<o:p></o:p></p></div><div><div><p = class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p = class=3DMsoNormal>--&nbsp;<br>Dr. Samuel R. Mathias<br>Center for = Computational Neuroscience and Neural Technology<br>Boston = University<o:p></o:p></p><div><p class=3DMsoNormal>677 Beacon = St.,&nbsp;Boston, MA 02215<o:p></o:p></p><div><p = class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p = class=3DMsoNormal><o:p>&nbsp;</o:p></p></div></div></div><div><p = class=3DMsoNormal><o:p>&nbsp;</o:p></p></div></div></div></div></body></h= tml> ------_=_NextPart_001_01CEB345.9DA745F1--


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