Dot probe doubt

[Mateo Leganes Fonteneau]

Dear all.

I am implementing a dot probe task.

I carefully followed the instructions shown here, but I have a couple of 
problems.
I am following this pattern explained on 2009: 
http://images.redial.net/awdpsirous.bmp

My point is that I have 12 pairs of words (each word in a different list) 
and I need to present each of the pairs 4 times, inverting the position of 
the words (up down) and the positions of the probe, of course this has to 
be randomized at all levels. 

I only get to present each pair once, even if the position of the words or 
probe gets randomized, I can't figure out how to take each of the pairs of 
words through the 4 conditions at random at all levels. 

I add a screenshot to clear myself a little bit.

Thank you. 


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