23 Oct
2008
23 Oct
'08
3:09 p.m.
Hi,
I have 2 questions.
1) How do I calculate psd min, max, and dpsd. Is there a formula for calculating these values? I have 4 kinds of stimuli, stim duration = 3s, stim repetition = 25, TR =2 so:
optseq2 --ntp 180 --tr 2 --psdwin [?] --ev A 3 25 --ev B 3 25 --ev C 3 25 --ev D 3 25 --o 4types --tsearch 10 --nkeep 4
What should my psd min, max, and dpsd be?
2) My task is history-dependent. I would like to control the probabilities that stimulus B follows A, C follows A, A follows D... Is there a way for me to do that with optseq?
Thank you so much for your help.
Cheers, Linh