Dear SPMers,
I have a question concering the adjusted response scores and transposing them into real numbers. I am curious to know if I am using an appropriate conversion formula to make sense out of the adjusted response scores we got from spm99 plotting.
formula--> (adjusted score * Z-score) + 50= rCBF (or some real number)
1. (adjusted scores range from -5 to 5)
2. (Z-scores- were selected for a coordinate that represents the ACC)
3. (50 is where the global mean was set, this is the default option)
4. (Our analysis was done using proportional scaling, but I read in MEDx that they suggest using AnCova for PET studies, "what is your opinion?")
---When we do this we get score that range from 40 to 60 rather than -5 to 5. In addition, we see more activation for the active task compared to the neutral task.
---Can you please tell me if this sounds correct or if we are heading the wrong direction? As always, thanks so much for all your help.
Take care,
Dana
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