CPT-AX

[Lijffijt, dr. M.]

I am trying to make a CPT-AX task (with numbers) for children. What I did is that I defined three columns: one for a prime (the 8 or a 0), one for a Target/Non-target (2 to 7) and one for CorrectAnswer (either {SPACE} or nothing. The target is an 8 and then a 7. Other combinations of with or without an 8 are non-targets. I had problems with trials in which only the non-target (without a prime) should be presented. Eventually, I edited the script with an If .. Then solution to avoid presenting the prime when the prime is 0. This worked out fine.
 
The other problem I could not deal with. Sometimes, for non-targets, the Target.ACC indicates 0 whereas (correctly) no hit was made. This should be 1 (correct). Secondly, not on all trials the CRESP is {SPACE}. Sometimes nothing appears. What should I do, for I guess that the problem with th ACC being 0 instead of 1 is because I want to collect no response on some trials.
 
Who could help me with this problem.
 
Marijn Lijffijt
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