I often debate whether increasing types of working memory - i.e. strings of numbers, is actually helpful to real life. If it were, then I would be congratulating you on this training. I would be interested if you are aware of proof of its usefulness?
in a related example - the brain-training Nintendo DS games came out; people were able to show improvements in number tasks or sudoku's, but when evaluated scientifically (; at a later time), the improved skill was shown to not be applicable to other areas of life, rather; just good for in-game skill level. (I don't know where the sources for this information are)
I have no proof that what I'm doing is transferable. But in my defense I'm almost certainly doing more general and longer-term working memory training than any video game does, and there would also be a lack of evidence for the effectiveness of (I think) nearly any other type of learning I could do with my son.
The study you mention isn't directly applicable because, as I interpret your comment, the evaluation occurred after people stopped playing and I'm claiming my son will probably benefit for as long as we continue the training.
I continually train my ten-year-old son’s working memory, and urge parents of other young children to do likewise. While I have succeeded in at least temporarily improving his working memory, I accept that this change might not be permanent and could end a few months after he stops training. But I also believe that while his working memory is boosted so too is his learning capacity.
I have a horrible working memory that greatly hindered my academic achievement. I was so bad at spelling that they stopped counting it against me in school. In technical classes I had trouble remembering what variables stood for. My son, in contrast, has a fantastic memory. He twice won his school’s spelling bee, and just recently I wrote twenty symbols (letters, numbers, and shapes) in rows of five. After a few minutes he memorized the symbols and then (without looking) repeated them forward, backwards, forwards, and then by columns.
My son and I have been learning different programming languages through Codecademy. While I struggle to remember the required syntax of different languages, he quickly gets this and can focus on higher level understanding. When we do math learning together his strong working memory also lets him concentrate on higher order issues then remembering the details of the problem and the relevant formulas.
You can easily train a child’s working memory. It requires just a few minutes of time a day, can be very low tech or done on a computer, can be optimized for your child to get him in flow, and easily lends itself to a reward system. Here is some of the training we have done:
The key is to keep changing how you train your kid so you have more hope of improving general working memory rather than the very specific task you are doing. So, for example, if you say a sequence and have your kid repeat it back to you, vary the speed at which you talk on different days and don’t just use one class of symbols in your exercises.