Hi SPMers,
After carrying out single subject analysis of my fMRI data, I extracted BOLD contrast estimates from a priori ROIs using MarsBaR toolbox. The contrast estimates showed positive correlation with behavioral data. However, on performing whole brain multiple regression analysis (using SPM) between con images of all the subjects and behavioural data on the ROI masks, no correlation was obtained.
Can someone please explain, why it can be so??
Regards,
Shilpi Modi,
Scientist,
NMR Research Centre,
INMAS,
Lucknow Road, Timarpur,
Delhi-54
India
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