Thanks Steve! once i run the 1st level analysis using different models , i was planning on
comparing the models by comparing the PE values extracted from an ROI after running the
group analysis. Is this a valid approach? or is there a better way to do this. Also, i'm
slightly confused about whether i should be using a temporal derivative at the 1st level if i
want to compare various models. Please correct me if i'm wrong: Temporal derivative
would absorb any differences in Onset latencies and so the model fit (and hence PE)would
then be dependent only on height and shape of the response. So would you recommend the
use of temp. derivatives considering i'm comparing models?
Thanks!
-Vishwadeep Ahluwalia
|