Dear SPMusers,
I have a study in which conditions are not balanced across runs.
Therefore, run1 may have conditions 1 and 4 and run2 may have
conditions 2 and 3. SPM complains if I set the onsets for a condition
to be empty. All it should translate to is an empty column in the
design matrix, which would be eliminated when the matrix is reduced.
The reason for entering empty conditions is that I would like to say
each run has all the conditions, but only enter events for the
conditions that actually exist in the run.
Is this something that's part of the design intentions? Or am I doing
something incorrectly?
Thanks,
Satra
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