Generation of procedure based on standard deviation of the previous reaction times of trials.

[Rodrigo Henríquez Chaparro]

Hi E-prime staff! 

I have a behavioral task that consists in a presentation of  a stream of 
letters that appear in the center of the screen, where the  participants 
should to respond pressing a button when the  "x" letter is present and 
with other button  to any other letter.

However, I need to present  a "question trial"  when the SD of the previous 
reaction times of trials is more a  2 SD, considering  the enough trials, 
 to make the average.
So my question is, how to program these trials "question" based on the  SD 
of the previous Reaction times of trials of participants?

 Looking forward to your precious comments and suggestions
 
Thanks a lot!
 
Best,
 
Rodrigo.

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