By Ulrike Nestler - 10/8/2015
Hello,
i am currently programming shifting paradigm such as the color-shape task which basically consist of switch and no switch trials. And I need to know an expression that allows the order of trials to be randomized with the constraint that no more than 4 switch trials can occur in a row. Can you please help me with that? Because the usual noreplacenorepeat doesn't do it here.
Thanks!
UIrike
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By Dave - 10/8/2015
You need to use a <list> for trial selection, with its /maxrunsize set to 4.
<block myblock>
/ trials = [1-100=list.triallist]
</block>
<list triallist>
/ items = (trial.a, trial.b)
/ poolsize = 100
/ maxrunsize = 4
</list>
<trial a>
/ trialduration = 10
</trial>
<trial b>
/ trialduration = 10
</trial>
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By Ulrike Nestler - 10/8/2015
Thanks so much for this fast reply! :-D
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