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Since non-adaptive N-back scripts are available in the library (e.g. the on called simply "N-Back Task"; https://www.millisecond.com/download/library/v5/nback/singletasknback/singletasknback.iqzip ), my first question would be why you don't use those instead of trying to make an adaptive version non-adaptive.

Then, to achieve "that it will repeat N-Back 1 and N-Back 2 alternately on 6 occasions", basically all you have to do is edit

Note: list controls the level of N run during the test. By default, the test runs level 2, 3, 4, repeating
each level once and in sequence
<list nextN>
/items = (2, 2, 2, 3, 3, 3, 4, 4, 4)
/ selectionmode = sequence
/ selectionrate = block
/ resetinterval = 0
</list>

to look like

<list nextN>
/items = (1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2)
/ selectionmode = sequence
/ selectionrate = block
/ resetinterval = 0
</list>

Thanks very much for the advice Dave, much appreciated. I was indeed aware of the non-adaptive n-back tests in the library, but as I had previously set up this adaptive one with correct custom instructions etc., was just thinking there might be a quick change I could make to it to alter it to non-adaptive. But no problems, i can customize the non-adaptive one instead.

Thanks again
Rich

Hi!,
I am currently changing the adaptive n-back letters code in order to implement lures. I have already created a trial (trial lures), with the same features as the target trial. How can I introduce the lures in a non-random way?
I  just saw that I can introduce it in the trials inside the block, but it will be random....
/ trials = [1 = start; 2 - 21 = noreplace(nontarget, nontarget, nontarget, nontarget, nontarget, nontarget, lures,
target, target, target)]

Thank you in advance,

Mónica

> How can I introduce the lures in a non-random way?

You would specify when you want to run lure-trials in the /trials attribute. This need not be random. It is perfectly possible to specify, say, that the 3rd and 7th trials be lures while sampling other trials at random. E.g.

/ trials = [1 = start; 2, 4-6, 8-23 = noreplace(nontarget, nontarget, nontarget, nontarget, nontarget, nontarget,
target, target, target); 3, 7 = lure]

Hi!

Thanks Dave for your answer. But, it would be appear in the third and seventh position no matter what. The problem is that a lure is a distractor that appears just before the target. Can I do the next thing:
/ trials = [1 = start; 2-6, 9-23 = noreplace(nontarget, nontarget, nontarget, nontarget, nontarget, nontarget,
target, target, target); 7 = lure, 8 = target]??
I mean, I want that everything is random, as usual, but if there is a lure, it should appear just before the target.
Thank you again and thank you for your quick answer!

Yes, you can do that -- at least, I don't see any reason why not. You could also just /branch from <trial lure> to <trial target>, in which case you would not have to specify

7 = lure, 8 = target