How to limit the list samples OR to a certain time depending on which condition is met first.

[Ellie van Setten]

Hi everyone,

I am doing an fMRI experiment with children with dyslexia and controls. 
They have to perform a rhyming task. Because control children are much 
faster than dyslexic children I would like the response time to be variable 
(because otherwise it would be extremely boring) The problem is that the 
scanner needs to synchronize with the E-prime task after a fixed time (the 
scanner sends a trigger that allows E-prime to go on). My solution would be 
to limit the time the children can spend on the task to three minutes, then 
have a small break with a fixation cross and synchronize and then go to the 
next block. Only for the fast children I would like that they go to the 
break a bit earlier, after 25 trials. So I want to pick 25 samples from my 
task list OR I would like to stop the task and go to the break after three 
minutes. Preferably letting the children finish the trial that was started. 
I have tried using some in-line codes but this did not work. I hope you 
have suggestions how I can solve this problem.

Best, 

Ellie

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