Dear all,
>> Simply specify the 'null events' as a separate condition with
>> their own vector of onset times. You will then be able to look explicitly at
>> contrasts between active events and 'null events'.
Mea culpa! Rik has very kindly pointed out that this advice just given by me
(without a cup of coffee, very early in the morning here in Los Angeles - I
should have just stayed in bed) is WRONG! Well, not entirely wrong, but you
will waste a precious degree of freedom by modelling null events separately
from the baseline. See http://www.mailbase.ac.uk/lists/spm/2000-01/0119.html
Geraint
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Dr. Geraint Rees
Wellcome Advanced Fellow, Lecturer,
Mailstop 139-74, Institute of Neurology,
California Institute of Technology, University College London,
Pasadena, 12 Queen Square,
CA 91125 London WC1N 3BG
voice (626) 395-2880
fax (626) 796-8876
web http://www.klab.caltech.edu/~geraint
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