Dear Donald,

I have one more question.

I want to see the strength of the PPI regressor in a specific ROI.

I was thinking about using Marsbar in order to extract beta weights of the PPI regressor (using the con image of each subject that corresponds to the PPI regressor or in other words the con image that was created using the 1 0 0 contrast).

By doing this, I will get the beta weights for the interaction term for each subject and then I could perform a regression analysis between these values (strength of interaction) and some behavioural data.

Do you think that this is reasonablee and correct?

Thank you in advance,
S.