<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML><HEAD><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8"></HEAD><BODY><DIV>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.</DIV>
<DIV> </DIV>
<DIV>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.</DIV>
<DIV> </DIV>
<DIV>Who could help me with this problem.</DIV>
<DIV> </DIV>
<DIV>Marijn Lijffijt</DIV></BODY></HTML>