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Hi, well this is just from personal experience so ymmv, but I've been playing the game off and on for the past two years and am convinced of positive effects.
I do know that, beforehand, I had never been able to study for protracted periods of time and enjoy the experience - for me, studying had always been a fight against intellectual and physical restlessness (=restless legs, itching, shifting about on my seat). DnB seems not only to permit me to sit down and focus for long periods, it actually makes me want to study - I feel compelled to learn and get annoyed if prevented from doing so. And when I do study, I can now put in serious hours (typically three or four chunks of 2 1/2hr blocks).
I'm sure that this sounds somewhat implausible, but there have been many occasions on which I have been overwhelmed yet again by the determined demons of dilettantism and distraction only to remember what I had let slip from my routine.
I would not be so sure of positive effects if, after having trained for a few days, I had suffered an exacerbation of symptoms, but this has not occurred.
The simplest explanation that I can think of is that it is the only activity that forces me to use the entirety of my attention, encouraging me to eliminate distracting thoughts (as in meditation?) whilst also providing a tightly-defined focal point (the stimuli in space and time) and overarching purpose (to find order (as organizing my impressions helps me remember)). Perhaps this is where my feelings of increased purposefulness come from: the game trains me generally to enjoy drawing connections, and I begin to want to organize the world around me.
What do you use to do your dual-n-back training?
I have been using the cognitivefun site and, more recently http://www.brainboffin.com/, which permits me to do more than 9-back. There is a multimodal version at http://cognitivefun.net/test/24 that I also occasionally use.
I would use the downloadable Brain Workshop but am running an inflexible OS on decrepit hardware and do not have the wit to get it to work.
You are able to do more than 9-back? I just have to say: Wow!
I'm downloading Brain Workshop as I speak. I'll have a play and see how it compares to the Luminosity games I've tinkered with.
Seconded. (I find dual 1-back challenging and dual 2-back nearly impossible. I have not practiced much, though.)
I'm surprised by the discrepancy in scores. I can also do more than 9-back and personally know people who are considerable smarter than I am (e.g., Nick Bostrom and Robin Hanson). I suspect that the n-back game does not very strongly correlate with IQ, or else that scores in this game can be dramatically boosted by the use of certain subtle mnemonic and visualization strategies, which even intelligent people may fail to adopt.
Weird. I find 2-back pretty easy, but 3-back difficult (I normally get 50-80% accuracy) and 4-back quite tough (20-50% accuracy). I wonder what a typical dual n-back level is.
Edit - OK, pulled up some actual data for anyone else who's curious. The 35 University of Bern students trained in the 2008 study by Jaeggi et al. had a mean dual n-back level very close to 3. After 8-19 days of training that increased to 4-5. The 25 National Taiwan Normal University students who trained on dual n-back for this 2009 Studer et al. poster went from a mean n-back level of 2.0 (with a standard deviation ~1.1) to ~4.6 (standard deviation ~2.3) with 20 days training.
I guess another question I'd like to ask is whether you enjoy dual-n-back. I've tried it a couple of times and consistently disliked it precisely as I would dislike a cold shower.
Now that I think of it, there are many mental activities that I dislike precisely that way. (Or, at least, there used to be many; now there are fewer.) One of them is the Gunnery puzzle in Puzzle Pirates. To try to extract a general trend here, I tend to dislike things that require me to react quickly. I used to loathe such things, along with a host of other things: asymmetry, discontinuity, permanence. If I had been omnipotent when I was a kid, perhaps I would have replaced the world with a sphere.
Gosh, I was a really messed-up kid back then.
The things that I enjoy in a game are repetition, speed and simple strategy. I guess that dnb has the first two. When I started playing it I think I found it 'intriguing,' as it felt so odd to play. What I enjoy about it now is the way in which it highlights my distracting thoughts and pushes me to disregard them - this can be relaxing after a tough day at work.
It sounds like the games you like are precisely the games I don't like.