Hello, I have a few questions. I am interested in looking at the difference in connectivity between an ROI and the rest of the brain during correct vs error trials.
1) I understand that PPI is probably the best option for this but I wanted to know what is the difference between doing a PPI analysis and doing 2 separate simple correlation analysis (1 for correct and 1 for error) and comparing the results in a ttest.
2) If PPI is preferable, would it be wise to put correct and errors in the same model (in the same 3dDeconvolve) if so, should the correct and errors be in the same regressor or as separate regressors OR should I do PPI analysis for the correct and a separate PPI analysis for errors and compare the interaction terms from each using a ttest.
Just trying to get an idea of what is the most correct option for what I want to accomplish. Thanks!
Amanda