Continuous Performance Task

[richard at wermes.de]

I would like to implement a Continuous Performance Task (CTP). With this 
task, single letters are presented and subjects are asked to react whenever 
they detect an X, appearing after an O appeared. I need about 500 trials 
for that and lets say 50 target-combinations.

The only idea that come to my mind was creating a list including the 
variables stimulus1 and stimulus2, including a procedure showing two 
textdisplays in a row (stimulus1 and stimulus2). My problem with that: I 
would need 250 rows in that list. If I had less rows and random cycles, i 
might get additional unwanted target-combinations..

Any ideas for different, more ellegant approches?

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