Stephan,
In addition to Richard's useful comments, you may want to have a look at
the paper:
Event-related functional magnetic resonance imaging: modelling, inference
and optimization.
Josephs O, Henson RN
Philos Trans R Soc Lond B Biol Sci 1999 Jul 29 354:1387 1215-28
which is a useful general guide for these kinds of questions.
Dave.
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David J McGonigle
Biomagnetic Imaging Lab,
Box 0628, Dept. of Radiology
UCSF, 513 Parnassus Ave
CA 94143 USA
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