Hi,
in the original Jaeggi research, no instruction was given to the
persons, whether to use any "method" or not. Using some sort of method
(rehearsal, imaginery lists, imagining letters in place of squares
etc.) definitely easies the training task, producing a higher N-back
average result. But in the original study, the people who get to
highest N-back average WERE NOT the same who get biggest IQ gain. This
means that
- dual-n-back task is not test of intelligence or stupidity
- average N is not correlated well to IQ gain, so
- the goal is not to get highest N-average.
Important is, that you are sitting focused on your ass :) trying to
memorize and remember - and usually get frustrated too. So putumayo,
make an IQ test for yourself if you want to see if this training helps
you. Of course you can try start using methods to remember, or maybe
go for the "triple" n-back.
This said, I have one tip why could the "method-approach" work too
(switching remembering and memorising), but the intuitive method
surely has some effectivity. And btw, it's definitely not "passive" -
I think there's big difference in "being focused", and "being focused
with the intention to memorize".