Terminate the slide only when the subject press a key after a random time

[Valerio Biscione]

I have searched on the group for other topics with this problem, but I 
haven't found anything. 
This is actually a normal Variable Interval schedule, so it's strange that 
hasn't been treated already.

I want to show a slide to the subject. At the beginning of the slide a 
random number is generated. This random number indicates the number of 
milliseconds that the subjects has to wait to receive a reward. Let's call 
this random number T. The subject can press the key anytime he/she wants, 
but only if he presses the time AFTER the time T he will receive a reward 
and the software can go to the next slide. If he presses the key before T 
he receive a punishment, but can still try to "win" the reward in the slide.

I already solved the problem to record all the RTtime that the subject 
press the key during the slide. The problem is to make the software to go 
further ONLY if the key is pressed after T. T is recorded in a variable, 
but won't be a problem to use an attribute.
Do you have any idea?
Kind Regards
Valerio 

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