Dear Pilar
If PPI.Y is filled with NaN's then Y it must have been filled with NaN's when you extracted it with
spm_regions since I believe the spm_peb_ppi code copies xY.Y into PPI.Y. I suggest searching the
list for PPI and NaN as a number of similar issues have been brought up on the list and it is
likely to have been dealt with in a previous message. If not then please re-ask.
thanks
darren
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On Mon, 27 Aug 2007 2:55:01 am CDT SALGADO PINEDA Pilar wrote:
Dear SPM list <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
I am currently doing individuals PPI analysis to evaluate the variation in connectivity patterns of
the amygdala in function of a cognitive factor.
The study includes two cognitive tasks, A and B, and a control task, C. I would like to study the
differences between task A and task B.
I have create the PPI_*.mat file for each subject using a spherical VOI, centred on the amygdala
(adjusted for the effects of interest). The factors included were:
- task A (contrast weight 1)
- task B (contrast weight -1).
My problem is that the PPI.Y (1st eigenvariate) created by this step is a NaN vector. Thus, I
cannot use it as "effect of no interest" in the subsequent analysis
I would be very grateful if someone could help me.
Thank you in advance
Pilar
Pilar SALGADO-PINEDA
Institut des Neurosciences Cognitives de la Méditerranée
UMR 6193 Université de la Méditerranée-CNRS
MARSEILLE (FRANCE)
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Darren R. Gitelman, M.D.
Department of Neurology
710 N. Lake Shore Dr. #1122
Chicago, IL 60611
Voice: (312) 908-8614
Fax: (312) 908-5073
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