I am new to optseq2 so I really need advices to my questions. We have an experiment of 2 factors with 36 trials for each factor, and another 24 null trials. So in total we have 96 trials. We also have 3 random jitters which make our trials could last for either 4.6, 5 or 5.4 seconds. The total session time is thus 480 seconds. Since our TR is 2 seconds, the ntp = 240.

 

    My questions are:

    (1) How can I set the psdwin? My intuition is that dPSD should be divided by both TR and trial duration. That means we can only have a dPSD = 0.2. Would that be too small? I observed that by doing this the largest psdmax is only  2 seconds.

    (2) What should I do if I want to break the session into two parts? The previous optseq version seems to allow one specify the runs for each sesssion. But I did not find this option in optseq2. Can I just use half the trials to get two sequences and use them for the two parts?

  

    Thanks! Your suggestion is appreciated.

 

Hongchuan