Subject: Re: ADAPTIVE SAME-DIFFERENT Procedures? From: Colette Mckay <C.M.Mckay@xxxxxxxx> Date: Thu, 18 May 2006 17:10:19 +0100This is a most unwise thing to do (combine an adaptive procedure with same-different task), since the relationship between hits and correct rejections on a same-different task depends critically on the response bias of the subject. Your 'threshold' difference will thus reflect subject bias. You are much better off using a procedure that (like NIFC) that controls response bias. regards, Colette ************************************************ Colette McKay Professor in Auditory Science School of Life and Health Sciences Aston University Aston Triangle, Birmingham, B4 7ET email: c.m.mckay@xxxxxxxx Phone +44 (0)121 204 4099 Fax +44 (0)121 204 3886 ************************************************ -----Original Message----- From: AUDITORY Research in Auditory Perception [mailto:AUDITORY@xxxxxxxx On Behalf Of Manon Grube Sent: 18 May 2006 16:33 To: AUDITORY@xxxxxxxx Subject: [AUDITORY] ADAPTIVE SAME-DIFFERENT Procedures? Hi all, I am not sure if I've only not come across it, or if there really isn't much out there on Combining an ADAPTIVE tracking with a SAME or DIFFERENT decision (where there are equal numbers of same and different trials) - NOT with an ODD ONE OUT decision (where there is always a, albeit declining, difference)? My best guess at the moment is that a classical 2 down 1 up tracking algorithm for example could be turned into a 1 different and 1 same correct (hit and correct rejection) to get one level down and, 1 wrong, be it same or different (false alarm or miss), to move one level up. Thanks a lot for any comments and references on this! Cheers Manon Manon Grube Research Associate Auditory Research Group Medical School University of Newcastle-upon-Tyne Framlington Place NE2 4HH UK phone + 44 191 222 3445