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-In a timeline variables procedure, when randomize_order is true and repetitions is greater than 1, the trial order will be re-randomized on each repetition through the timeline_variables array. This means that there will be some constraints on the randomization of all trials in the procedure.
-For example, if a timeline_variables array contains one trial per stimulus, then the same stimulus could occur twice in a row (since it could be at the end of one repetition and the start of the next one), but it could not be repeated more than twice in a row, regardless of the number of repetitions.
-If you don't want to constrain the randomization in this way, you could use the sample parameter with the fixed-repetitions option: this will combine all the repeitions of your timeline_variables array into one larger array, and then randomize the whole thing. You can read more about the randomization, repetition, and sampling options for timeline variables in the Timeline documentation).
In a timeline variables procedure, when randomize_order is true and repetitions is greater than 1, the trial order will be re-randomized on each repetition through the timeline_variables array. This means that there will be some constraints on the randomization of all trials in the procedure.
For example, if a timeline_variables array contains one trial per stimulus, then the same stimulus could occur twice in a row (since it could be at the end of one repetition and the start of the next one), but it could not be repeated more than twice in a row, regardless of the number of repetitions.
If you don't want to constrain the randomization in this way, you could use the sample parameter with the fixed-repetitions option: this will combine all the repeitions of your timeline_variables array into one larger array, and then randomize the whole thing. You can read more about the randomization, repetition, and sampling options for timeline variables in the Timeline documentation).