Millisecond Forums

That's great. You can put logic into the branch statement as long as it contains a "trial" result somewhere. The possibilities have become even more endless!

Thanks again,
  Malte 

No, but you can incorporate it directly into the /branch itself:

<values>
/ countmybranches = 0
</values>

<block myblock>
/ trials = [1=a]
</block>

<trial a>
/ stimulusframes = [1=mytext]
/ trialduration = 1000
/ branch = [if (true) {values.countmybranches+=1; trial.a}]
</trial>

<text mytext>
/ items = ("<%values.countmybranches%>")
</text>

Hi Dave, gold-standard answer! Thanks a lot.

Allow me a follow-up question. Is there an "on..." statement or something similar that fires ONLY when the block branches into the trial?

I know I could achieve about the same thing with some logic but I'd rather not since timing might screw things up.

This. block.ontrialbegin is defining global statements to be executed in *all trials* in the block. I.e.

<values>
/ count = 0
</values>

<block myblock>
/ ontrialbegin = [values.count+=1]
/ trials = [1=a]
</block>

<trial a>
/ stimulusframes = [1=mytext]
/ trialduration = 1000
/ branch = [trial.b]
</trial>

<trial b>
/ stimulusframes = [1=mytext]
/ trialduration = 1000
/ branch = [trial.a]
</trial>

<text mytext>
/ items = ("<%values.count%>")
</text>

is equivalent to

<values>
/ count = 0
</values>

<block myblock>
/ trials = [1=a]
</block>

<trial a>
/ ontrialbegin = [values.count+=1]
/ stimulusframes = [1=mytext]
/ trialduration = 1000
/ branch = [trial.b]
</trial>

<trial b>
/ ontrialbegin = [values.count+=1]
/ stimulusframes = [1=mytext]
/ trialduration = 1000
/ branch = [trial.a]
</trial>

<text mytext>
/ items = ("<%values.count%>")
</text>

No, actually it fires after, which you can see by doing something like this:

<values>
/ count = 0
</values>

<block myblock>
/ ontrialbegin = [values.count+=1]
/ trials = [1=a]
</block>

<trial a>
/ ontrialbegin = [values.count=666]
/ stimulusframes = [1=mytext]
/ trialduration = 1000
/ branch = [trial.a]
</trial>

<text mytext>
/ items = ("<%values.count%>")
</text>

Hope this helps,

~Dave