stroop task-randomize only one culmn

[I][edited by moderator][/I]
hi
i want to run the stroop task by using 3 stimuli - 4 colors and 2 subliminal primes (6 blocks each of 96 trials). I am using a design where I fix the order of the stimuli. I was wondering if there is a way to randomize only the color -we are going to do it in an fmri enviorment so i really need it to be randomized without having the same color twice in a row. Is there a way to do that with DirectRT ?

No, I do not believe there is a way to automatically constrain the randomization that way. It is a feature we have been thinking about though for a future version.