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Hello all,

I have a task with three conditions A, B, C. The trials in each of the
conditions are varied on a parameter which is a feature of the trial
stimulus. I used two models to assess activation differences across
three categories. The first model looked at each condition, A, B, C
and i compared across conditions (A-B, A-C, B-C...etc). In the next
model, I additionally used a parametric modulator for each of the
conditions A, Apm, B, Bpm, C, Cpm and used the second column as the
regressor for each condition. However, now when i compare across
conditions I do not see any differences. My question is, would it be
correct to infer that the difference I see across the conditions A, B,
and C is due to the parameter in question and not any other feature of
the stimulus?

Thanks!
Megha

-- 
Megha Sharda
Graduate Student
National Brain Research Centre
Manesar, Gurgaon -122050
India
Ph: +919810943202