Hi all,
I wanted to ask you advice regarding the creation of design matrix.
We run an event related experiment where participants saw a scenario (painful or neutral) for 2 seconds, then were asked to regulate their emotion for another 2 seconds (reappraise or watch) and finally had to make a judgment about the emotional intensity of a facial expression for 6 seconds (happy expressions or painful), all in all 8 conditions. There was no jittering between the section of the trails but only between the trails themselves.
1) Can we model the different sections of the trail? So for example only the 2 seconds of regulation following the observation of a painful scenario. Or do we have to treat the trail as a full unit because of the lack of jittering?
2) If we wanted to add a parametric modulator (the judgment made during the intensity ratings) how would go about setting up our onset file? At the moment, we are using a 3-column format which incorporates all the section of the trail (bellow) if we wanted to add the values of the selection made (After z scoring them) for the selection section, what values would we use for the other 2 sections (instead of the 1’s we use now)? Is this even possible?
0 2 1
2 2 1
4 6 1
10 2 1
12 2 1
14 6 1
Thank you!
Navot
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