What exactly do You mean with correlation ? Of course there are methods to calculate
the corellation (in statistical terms) between two Regions of Interests. But this would not
be that meaningful for neuropsychological research.
I assume You are interested in modelling the interaction between two Regions of Interest,
so that the results will allow a meaningful interpretation of the neurological interaction between
this ROI's. Based on physiologically plausible models.
There are two models of analysis in SPM for this. One is called Dynamic Causal Modelling (DCM),
the other is called Physio Psychological Interaction (PPI). In my Eyes DCM is the method of choice,
if You have no data aquired yet. The problem is: You will need TR's < 2 sec. for a good analysis.
I don't know much about PPI, only once I analyzed data set.
You can find data sets to get familiar with the practical side here:
http://www.fil.ion.ucl.ac.uk/spm/data/
But it is crucial to work through the theory underlying DCM and PPI...Keywords: Volterra Kernels,
Baloon Model.
Hope this helps.
cu
Ferenc
------------------------------------------------------------
Ferenc Acs
Lehrstuhl Prof. Dr. M. W. Greenlee
Institut für Psychologie
Universität Regensburg
93040 Regensburg
Tel. +49 (0)941 943 3582
Fax +49 (0)941 943 3233
http://www.psychologie.uni-regensburg.de/Greenlee/team/Acs/acs.html
>>> "Bernard Aoun." <[log in to unmask]> 11/03/04 10:05 >>>
Hello,
I am a junior SPM user, I would like to know if there is any method to
find out the correlation between two or more areas of activation.
thanks.
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