Reading more than one response

[Vaaal]

Hi, I know that I have already opened a topic today,  but I am working on 
more than one problem at time and I really need your help!

So I have this experiment in which the subject has to press a button (on a 
slide that we'll call "Waiting Slide"), then when the stimulus appears the 
subject releases that button and presses ANOTHER button. 
I want to record the time between the stimulus out and the release of the 
button (we'll call this *decision time*) and the time between the release 
of the button and the pressing of the other button (we'll call this 
*movement time*).
The first button is 2 and the second one is 4. 

In order to do so I added in the "alloweable keys" in the Stimulus slide 
this two keys: {-2}4  and in "correct" only 4. Then I changed the Max Count 
to 2. 
What happens is that everything works right, but there is a little bug that 
I am afraid the subject could learn. In the subject, on the Stimulus Slide, 
release key 2, and then PRESS AGAIN AND RELEASE AGAIN key 2, the slide will 
terminate. 
What I would like to do is just to ignore any other keys but 4, once that 2 
has been released. I cannot come up with any answer. 

I can think to do something that involves the creation of two different 
slides, one that reads -2 and the other 4, but I don't like that solution 
because this would mean to change a lot of things in the rest of the 
experiment..

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