what do you mean by "allowable null intervals"? If you mean that there needs to be a fixed amount of time between two stimuli, then you cannot use optseq for this. However, you can tell optseq that there are only two stimuli, which each stimulus is a pair. Then you'd have to go back and recode the timing file.

doug

Denis R wrote:

Hello,

We're designing a task that has two pairs of events (4 events total). Each pair of events has a pair of allowable null intervals associated with it. Is it possible to use optseq2 to create such a paradigm? Is it appropriate to use optseq2 in this case at all given these constraints?

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