Re: ADAPTIVE SAME-DIFFERENT Procedures?

[Colette Mckay <C.M.Mckay@xxxxxxxxxxx>]

This 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@xxxxxxxxxxx
Phone +44 (0)121 204 4099
Fax +44 (0)121 204 3886
************************************************ 


-----Original Message-----
From: AUDITORY Research in Auditory Perception
[mailto:AUDITORY@xxxxxxxxxxxxxxx] On Behalf Of Manon Grube
Sent: 18 May 2006 16:33
To: AUDITORY@xxxxxxxxxxxxxxx
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