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? 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
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