I had posted a question earlier regarding fractional signal change, and now
realize that this is actually the % signal change. I understand that for my
fMRI data using SPM99 I can, Plot > fitted and adjusted responses > choose my
contast > plot against scan or time > this gives me a graph of % signal change
over time.
Previous posting have stated that I would need to choose "proportional scaling"
What does this mean? Is this choosing 'scaling' or 'none' for Global
Normalisation?
thanks in advance for your help,
Maria
|