Hi, list,
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
2008-11-03
Hongchuan Zhang, Ph.D.
Postdoctoral Research Associate
Developmental Cognitive Neuroscience Laboratory
Northwestern University
2240 North Campus Drive
Frances Searle Building, Room 2-356
Evanston, Illinois, 60208
phone: (847)467-1549
e-mail: hongchuan-zhang at northwestern.edu
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