n-back/CRT - memory task

[Anne-Wil]

Hi Maayan,

I recently started e-priming again, after a bit of a break, so I am a bit 
rusty on terminology and doing code top of my head, but... how about...: 

have a triallist with two levels, and an attribute that codes for 'match' 
or 'no match' - set weights or loops to get to the number of trials that 
you need. Then on the session proc use inline code to generate random 
numbers to be used on the slide, and store the bottom number in a user 
defined variable. For a match trial, do not generate a random number for 
the upper nunber, but simply use the number that was used as the bottom in 
the previous trial (stored in your user defined variable). Thus only 
generate a new random number for the buttom and store that number in your 
user defined variable for use in the next trial. For a no-match trial, 
create a loop that first generates a random number for the top, then checks 
it against the previously used bottom number, and ends the loop if the two 
are not the same number. Create an additional random number for the bottom 
(and store it in the user defined variable for use in the next trial). 

Hope this makes any sense, and that is enough to get you going again. What 
you need to do is puzzle together the code for user defined variables, 
random number generation, how to engage in one piece of code or another 
based on the match/nomatch variable (or use two different procedures for 
the two levels of the triallist) and how to create a loop. 

best,

Anne-Wil 

On Thursday, 15 May 2014 19:37:10 UTC+1, maayan kedar wrote:
>
> 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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