Hi Everyone,

I also have this same question Michael asked, and extended. We have a delayed incentive task where people see either alcohol, food or neutral cues. They then see a quick target and press a button while the target is still on the screen to try and win. There is then a feedback stage of whether they won or lost. I am wanting to do gPPI, but wondering:

1) I want to analyze the cue phase and feedback phase separately. Is it appropriate when looking at the cue phase, at the 1st level, only select the cue regressors? Or, is it still necessary to also select the feedback regressors putting zeros for them in the 2nd level contrast - and visa-versa?

2) Related, if it is ok to only select the cue or feedback regressors (depending on which analysis I am doing) I am currently interested in? For example, when looking at alcohol > neutral cues, should I just load those regressors for the first level, or also include the food cue, as they are all cues?

Thanx in advance and many blessing,
Benson Stevens