Hi there,
I have a simple block design, ABAB, with no rest condition. I'd like to
determine using PPI which regions are positively and negatively correlated
to the activity of the amygdala separately in (1) block B only and (2) in
all blocks (entire time course).
In creating the PPI regressor from the amygdala timecourse, what I
understand to do is make a results contrast for all conditions
(i.e., .25 .25 .25 .25), and then use the VOI tool to extract the entire
amygdala timecourse using the VOI button. Is this appropriate?
In addition, after pressing the PPI button, how do I determine which
conditions to include, and their weights?
I'm somewhat of a novice at fMRI analyses, so the more detail you can
provide, the better.
Thanks so much,
Lara Foland
|