Hi
I want to vary which items get assigned to different trials between subjects (to counterbalance items across conditions). So I have a set of items called PairA, a set of items called PairB, etc. Then I have different types of trials, say Study4X1, Study 8X1, etc. I want subject 1 to see the PairA items in Study4X1 and PairB items in Study8X1, and the reverse for the next subject, PairB in Study4X1 and PairA in Study8X. In the actual experiment there will be more sets of items and types of trials. How can I set which items to use at the beginning of the experiment? I've tried the code below, but then it presents "item.pairA" literally, instead of sampling items from item.pairA.
<text shortpair>
/select = noreplace
/position = (45%, 40%)
/txcolor = (0, 0, 0)
/txbgcolor = (192, 192, 192)
</text>
<trial trial1sec>
/stimulustimes =[0=shortpair]
/pretrialpause = 200
/posttrialpause = 200
/trialduration = 1000
</trial>
<block study4x1>
/trials = [1-80 = noreplace(trial1sec)]
/preinstructions = (intro4x1)
</block>
<expt >
/blocks = [1=study4x1; 2=somblock]
/onexptbegin = [text.shortpair.item=item.pairA]
/preinstructions = (welcome)
/postinstructions = (endexp)
</expt>
Can anyone help me or point me to a good example in the task library?
Thanks,
Diane