Dear list,
I am interested in testing a negative interaction between two first level EVs, which are in turn modulated (3 column style).
Let’s say that EV1 is a subjective value (SV) modulator, and EV2 is a measure of inconsistency.
My hypothesis is that BOLD signal in certain brain areas would strongly correlate with SV (EV1) when inconsistency is low (low values in EV2), and at the same time would weakly correlate with SV when inconsistency is high (high values in EV2).
I think I can design this “PPI-style”, but I would like to double-check with you. Thus, I would include EV1, EV2 (and other EVs) in the GLM, and I would add an interaction EV between EV1 and EV2 (any suggestions about min/mean centre are welcome). Since I am interested in the NEGATIVE interaction, I guess I should make a COPE with 0s for all EVs except for the interaction EV, which would be 'minus 1'. Am I in the right way?
Thanks a lot in advance for your help!
Javier
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