probabilistic stimuli

[Pauline FAVRE]

Dear E-prime users,
I try to control the occurrence of the a stimulus, i.e., during the 
experiment, each trial consist first of a presentation of a stimulus and 
then I would like that another image appears for only 80% of correct 
responses on the previous stimulus (and different images for the remaining 
20% and the incorrect responses). 

In summary, I just would like that a specific stimuli appears in 80 % of 
the cases.

Is there an inline script that permit that a stimuli appears only in a 
determined percentage of trials?

Thank you very much for your help!




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