Hi Alberto,
What is the interval between Response1 and Cue2? What is the intertrial interval? Are these intervals constant or variable? Are the trial onsets or stimuli onsets jittered relative to the TR? What are the typical mean RTs? What exactly is the contrast that you are trying to make?
These factors can have a large effect on how well you can resolve the different events within each trial and whether your activation maps are empty.
jack
|