It looks like your duration is too long. It should correspond to the
length of a condition, not the period of the paradigm. So if you had
10s baseline followed by 10s activation, repeated say 6 times, then
your duration should be 10s and not 20s.
Hope this helps
Torben Ellegaard Lund
Assistant Professor, PhD
The Danish National Research Foundation's Center of Functionally
Integrative Neuroscience (CFIN)
Aarhus University Hospital
8000 Aarhus C
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Den 05/03/2009 kl. 16.49 skrev SUBSCRIBE SPM Anonymous:
> Dear all,
> I have a question about setting up design matrix for block length
> that is
> not a dividable by TR.
> I found out in older messages that one can set non-integer scan
> numbers/onset time in SPM5.
> I tried to use the onset time for my block.
> unit: second.
> onset: [5.05 25.03 45.8 .....]
> duration: 20.16
> and it turns out that my design matrix looks like this ( .jpg in
> attachment )
> I couldn't figure out why it is the case.
> This is just a 6-block block design, starting with a off-condition.