Hello SPMers,
we noted that PPI gives different results depending on the SPM5 version -
please see attached image:
Whereas the extracted regional time course (extracted via ROI function in
the older version, and
the eigenvariate function in the updated version) were exactly the same.
What turned out to be different
is the psychological variable (one regressor of the original model), and in
consequence, the convolved
regressor.
Should add that we set up the basic SPM model separately in both versions -
no differences at this level.
It seems that the deconvolution step is somehow different. Does anybody
know if PPI has been updated between
the dates (see image) in a way that this might occur?
Thanks for any advice,
Philipp
Max Planck Institute of Psychiatry
NMR Research Group
Kraepelinstr. 2-10
80804 Munich
Mail: [log in to unmask]
Phone: 0049-89-30622-413
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