Dear all,
I have a readily specified design (SPM.mat) for an ER-fMRI study.
The design has been specified with canonical hrf only.
Inititial analyses now suggest that it might make sense to add
the temporal and dispersion derivative.
Is there any way to change the existing SPM.mat to include those additional
regressors (so I don't have to enter all the onsets etc. again?)?
I already tried something like:
load SPM.mat
SPM.xBF.order = 3;
SPM.xBF.name = 'hrf (with time and dispersion derivative)';
save(fullfile(SPM.swd,'SPM.mat'),'SPM')
but this didn't work out (program always crashed when trying to estimate the
design); error message says:
Initialising parameters : ...computing???
Attempt to reference field of non-structure array 'defaults'.
Error in ==> c:\programme\spm2\spm_spm.m
On line 464 ==> MAXRES = defaults.stats.maxres;
I know that this kind of problem could be "easily" circumvented by setting
everything up in a batch file but I had (and have) a hard time to specify
the onsets and durations of my stimuli in the batch mode so I decided to
enter them manually ...
any help - thx a lot in advance
claus
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