Hi,
As per the IBEX documentation, rshuffle will evenly distribute the trials as identified by the labels you pass to the function. If you label your filler trials differently from the other ones, and one argument of rshuffle captures those labels, then it will try to separate any two filler trials by the same number of other trials. Using that method, as long as you don’t have 6 times as many filler trials as other trials, you shouldn’t end up with 6 fillers in a row
If you don’t want the sort of even distribution you get from rshuffle, then randomizeNoMoreThan is the way to go. Just make sure you have proper references to your trials’ labels
Jeremy