n-back/CRT - memory task

[maayan kedar]

Hi there,

I was asked to build a memory task in which the subject need to identify if 
the upper number between 2 numbers is match to the the number was at the 
buttom one screen berofe. for example:

_0_    (beginning)
  8

_7_ (7 dosn't match to 8)
 5

_5_ (5 match to 5)
 3

_2_ (2 dosnt match to 3)
 9

the thing is that I need to create 50% matches, and I don't know how to 
link each text to the text from the slide before sense in each trial new 
random numbers are selected.

any ideas for help?
with regards,
maayan

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