Hi Ruth, there are no ways to constrain the order of the stimuli in this way in optseq. If the timing is fixed between these 3 items, then they are effectively one stimulus type, and you can optimize the order of that one stimulus type.

On 11/10/2016 01:31 PM, Ruthie Shaffer wrote:

Hi all,

I’m posting to ask for advice on setting up certain parameters in optseq2:

Specifically, in optseq2, how can one set up parameters to best optimize a task where there are say 20 items presented 3 times, where the relevant contrasts are between the first, second, and third presentations of the same items? Meaning the second presentation must come sometime after the first and the third presentation must come sometime after the second?

Thank you so much for any help on this!

Best wishes,

Ruth _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer