By Kolfers - 11/2/2014
Hi,
I have a very short question, I'm sure it must be in the helpfile or forum somewhere, but I'm having trouble finding it.
So in a block I want to present trials in a pseudorandom order. I know that the code below will prevent repeated trials (as far as possible).
<block 1>
/ trials = [1-8= noreplacenorepeat(stim1,stim2,stim3,stim4)]
</block>
However, if I would want to prevent only double (and upwards) repetition of the same trial: e.g. allow trials to be repeated once.
Would the following code be correct?
<block 1>
/ trials = [1-16= noreplacenorepeat(stim1,stim1,stim2,stim2,stim3,stim3,stim4,stim4)]
</block>
Thanks!
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By Dave - 11/2/2014
You need to use a <list> element for trial-selection with its /maxrunsize set according to your needs:
<list triallist>
/ items = (trial.a, trial.b, trial.c, trial.d)
/ poolsize = 16
/ maxrunsize = 2
</list>
<block myblock>
/ trials = [1-16 = list.triallist]
...
</block>
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By Kolfers - 11/2/2014
Ah..that makes sense!
Thank you for the quick response, and on Sunday at that!
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