Millisecond Forums

Yes, you can do that. You need to store the latency / latencies (or mean latency?) from the 1st block somewhere. You can then set the stimulus duration in the 2nd block via the <trial> element's setstimulustime() function. Simple example:

<expt>
/ blocks = [1=block1; 2=block2]
</expt>

<values>
/ alatency= 0
</values>


<block block1>
/ trials = [1=atrial]
</block>

<block block2>
/ trials = [1=btrial]
</block>

<trial atrial>
/ ontrialend = [values.alatency=trial.atrial.latency]
/ stimulusframes = [1=atext]
/ validresponse = (57)
</trial>

<trial btrial>
/ ontrialbegin = [trial.btrial.setstimulustime(shape.eraser, values.alatency); ]
/ stimulusframes = [1=btext]
/ validresponse = (57)
</trial>

<text atext>
/ items = ("Press the spacebar")
</text>

<text btext>
/ items = ("This stimulus will disappear after <%values.alatency%> milliseconds.")
</text>

<shape eraser>
/ shape = rectangle
/ color = white
/ size = (100%, 25%)
</shape>

Thx for the response as always! I was hoping for something along the following lines to work: 

<values>
/ one_trialslatency=0
</values>

<expt >
/blocks = [1=one;2=two]
</expt>

<block one>
/trials = [1-5=one_trials]
</block>

<block two>
/trials = [1-5=two_trials]
</block>

<trial one_trials>
/stimulustimes = [1=press]
/validresponse = (" ")
/ ontrialend = [values.one_trialslatency=trial.one_trials.latency]
</trial>

<trial two_trials>
/stimulustimes = [1=fixationcross]
/ timeout = values.one_trialslatency
</trial>

<text fixationcross>
/items = (" + ")
</text>

<text press>
/items = (" press the spacebar ")
</text>

The big question is whether I can save somehow 5 latencies, as timeouts for 5 trials in the second block. As it is currently designed it only uses the latency of the last trial.

Thx!

You can absolutely store several latencies and use them later on. You can use a <list> for that:

<expt >
/blocks = [1=one;2=two]
</expt>

<block one>
/trials = [1-5=one_trials]
</block>

<block two>
/trials = [1-5=two_trials]
</block>

<trial one_trials>
/stimulustimes = [1=press]
/validresponse = (" ")
/ ontrialend = [list.latencylist.appenditem(trial.one_trials.latency)]
</trial>

<list latencylist>
/ selectionmode = sequence
</list>

<trial two_trials>
/stimulustimes = [1=fixationcross]
/ timeout = list.latencylist.nextvalue
</trial>

<text fixationcross>
/items = (" + ")
</text>

<text press>
/items = (" press the spacebar ")
</text>

Works great! Thx for the quick replies!