Jim -
You could take a lookt at:
http://imaging.mrc-cbu.cam.ac.uk/imaging/DesignEfficiency
and the references cited witin.
Rik
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DR RICHARD HENSON
MRC Cognition & Brain Sciences Unit
15 Chaucer Road, Cambridge,
CB2 7EF England
EMAIL: [log in to unmask]
URL: http://www.mrc-cbu.cam.ac.uk/~rik.henson
TEL +44 (0)1223 355 294 x522
FAX +44 (0)1223 359 062
MOB +44 (0)794 1377 345
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>-----Original Message-----
>From: SPM (Statistical Parametric Mapping)
>[mailto:[log in to unmask]] On Behalf Of Dr James K. Kroger
>Sent: 19 December 2006 02:21
>To: [log in to unmask]
>Subject: [SPM] References for "bunching up" trial types in
>event related fMRI?
>
>
>Hello, on the SPM website there is a history of SPM. It is stated
>therein:
>
>"This was the efficiency with which responses could be detected and
>estimated. Using an analytical formulation, it was simple to show that
>the boxcar paradigms were in fact much more efficient that
>event-related paradigms, but event related paradigms could be made
>efficient by randomizing the occurrence of particular event such that
>they "bunched" together to increase experimental variance.."
>
>If anybody has references about "bunching together" events of a type,
>it would be much appreciated. Thanks.
>
>Jim
>
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