Some of this might be fixed with a newer version of optseq: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/optseq2

The long last NULL might not be fixed. It is just hard to get all the things to add up to get the right amount of time, so it time is left over, it adds it to the end

On 07/08/2016 07:39 PM, Feng Zhou wrote:

Dear experts, I'd like to use optseq2 to optimize the order of events as well as inter stimulus intervals. My experiment contains 3 runs and each run contains 3 events, say Cp, Cn and Pobe events Each stimulu will be presented 4, 4 and 1 sec and the numbers of times that each event type will be presented during the course of the run are 12 12 and 4 respectively, and interstimulus interval ranges from 8–12 sec. So each run would last around 380 sec. I used the following code: optseq2 --ntp 380 --tr 1 --psdwin 0 20 1 --ev Cp 4 12 --ev Cn 4 12 --ev Prob 1 3 --evc 1 -1 0 --tnullmin 8 --tnullmax 12 --nkeep 3 --o IAPS --nsearch 10000 However, the durations of some NULL events were more than 12 sec and the last NULL events were more than 30 sec. Did I use optseq2 in the right way? How could I fix it? Thanks in advance & Best regards, Feng Zhou

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