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Group: Administrators
Posts: 13K,
Visits: 104K
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You can, for example, enter your "punish" and "reward" trials into a <list> in the desired proportions and then /branch from your "main" trial(s):
<block myblock>
/ trials = [1-100=mytrial]
</block>
<trial mytrial>
/ stimulusframes = [1=mytext]
/ validresponse = ("d", "k")
/ correctresponse = ("k")
/ branch = [list.feedbacklist.nextvalue]
</trial>
<trial punishment>
/ stimulusframes = [1=punishtext]
/ validresponse = (0)
/ trialduration = 12000
</trial>
<trial reward>
/ stimulusframes = [1=rewardtext]
/ validresponse = (0)
/ trialduration = 2000
</trial>
<list feedbacklist>
/ items = (trial.punishment, trial.reward)
/ poolsize = 100
/ itemprobabilities = (.75, .25)
</list>
<text mytext>
/ items = ("Press D or K")
</text>
<text punishtext>
/ items = (":( Wait for 12 seconds.")
</text>
<text rewardtext>
/ items = (":) Wait for 2 seconds.")
</text>
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