Millisecond Forums

You can do that using  /iscorrectresponse attributes in your <trial> element(s).
<expt>
/ blocks = [1-2=noreplace(square, triangle)]
</expt>

<block triangle>
/ trials = [1-4=mytrial]
</block>

<block square>
/ trials = [1-4=mytrial]
</block>

<trial mytrial>
/ stimulusframes = [1=mytext]
/ validresponse = (4,6)
/ iscorrectresponse = [(script.currentblock=="triangle" && trial.mytrial.response==4) || (script.currentblock=="square" && trial.mytrial.response==6)]
</trial>

<text mytext>
/ items = ("<%script.currentblock%>")
</text>

That's great - thanks for your help! I now have another problem regarding this task.

It works great, but I'm having trouble with my output, because the blocks differ in terms of the target characteristic, yet the trials are exactly the same... the output is messy, because the outcome variables need to be calculated for each block separately in order to be correct. I only need three outcome variables to be calculated, which are whether the target was a) absent, b) local-target, c) global-target, however the type of target corresponding to the block is irrelevant.

How can I include in my script that "block.triangle and trial.triangle.square = a global-target" ; "block.triangle and trial.square.triangle = a local-target" ; "block.triangle and trial.circle.square = target-absent"?
I tried playing around with Summary Data, but it didn't seem to work.

Thanks :) 

In the same way as before. You use conditional logic in /ontrialbegin and/or -end to update a variable (<values> entry) as needed.

<values>
/ targettype = ""
...
</values>

<trial triangle.square>
/ ontrialend = [if (script.currentblock=="triangle") values.targettype = "global"]
/ ontrialend = [if (script.currentblock=="square") values.targettype = "local"]
...
</trial>

<trial square.triangle>
/ ontrialend = [if (script.currentblock=="triangle") values.targettype = "local"]
/ ontrialend = [if (script.currentblock=="square") values.targettype = "global"]
...
</trial>

etc. and logging the value to the <data> file

<data>
/ columns = [... values.targettype... ]
...
</data>