I've been doing it for a long time off and on, and I'm currently plateauing at 9 back.
IQ
My opinion on DNB is complicated and I believe DNB is limited when people define it's viability by the scope of IQ results. I did happen to score higher on a IQ test after using DNB, I do not believe that my crystalized intelligence has changed, and I do not think that everyone could expect that result. People, like me, who have hypofrontality and low alpha brainwaves will benefit from the training. You can't get a newer car (more powerful brain), but you can become a better driver. Basically, damaged brains will benefit. In a world of extraordinarily high stressful stimulation devoid of natural human interaction and reckless diets there are many of us with damaged brains, and a lot of people who could benefit from DNB. Hypofrontality is the signature sign of an addict.
Meditation
Dual N Back for me has become more of meditation than anything else. In Japanese Zen Buddhism there is a meditation technique where the pupils meditate and when they a seen losing their attention to the practice then they are struck by the master. This practice, albeit masochistic, is an effective means of biofeedback, and this practice is essentially the same way DNB works. When doing DNB my attention will drift, and then my performance will plummet, and the little red warning signs will flash. This gives my ego (the part of me that wants to perform well and doesn't like the red warning signs) awareness of my subconcious (the present-involved aspect of myself that is either relaxing into the practice or daydreaming without my control). It becomes a great arena to test the strength of your mindfulness meditation abilities, as you must let go of everything to perform well. Since doing DNB my ability to meditate has skyrocketed, and with it all the benefits one reaps from meditation has skyrocketed; patience, insight, self control, visualization abilities, more abstract thinking because I can tie more threads together.
Alpha brainwaves
I've spent a lot of time with binaural and isochronic beats so that I can recognize the different brain states (high and low beta, high and low alpha, gamma, and even delta) [I do not recommend overusing these beats unless you enjoy tinnitus]. Since doing DNB I have more of a grasp on my brainwave status, like an equalizer knob I can turn up and down at will. While doing DNB your brain naturally learns to go into a deep trancelike alpha state, because the exercise simply can't be done in the stressed out beta, thus biofeedback. This access into my brainwave state has made it easier to fall asleep when I want, or be excited or relaxed when I want, or be however I see fit for a situation. It has dramatically improved my public speaking skills, social skills, creativity, and ability to express myself. All of those traits are hallmark signs of a brain in the alpha state, completely merged into life and activity. At moments I feel myself in a complete state of non duality, which is a bliss-like state of being connected to everything.
Lucid dreams
I don't know if it is DNB increasing visual-spatial intelligence, improving trance-like unified brain states, or both that causes this... but I have unfathomably lucid dreams now. This is fun, and a great source of creativity, but can also be exhausting.
Do you have any tips?
My tip is that it doesn't matter if you use chunking or not (for example on 6-back memorizing the first three, then memorizing the next three as two different sets) Also it is completely frustrating and slow to get results, just like working out it feels like a complete waste of time at the beginning.
There are a few well known programs, but there are lesser known, maybe superior ones. What program do you recommend? What settings? Feel free to share clients for PC's and mobile devices.
I don't think that the program you use matters, as long as it is comfortable and you don't mind the sounds or visuals. I use braindscale.net. I do not recommend ever speeding up the stimulus rate to shorter than 3 seconds, as most people's delta brainwave is at about 2 seconds. The delta brainwave is sort of a reset brainwave to make really large commands on the brain systems, so if complex stimulation is coming in it is best to give the brain the time it needs. I tried practicing on 1 second simulations and it really messed me up for a while. Start with settings found from the Jaeggi study. I do not see a reason to use TNB or QNB.
What is your regimen?
I've tried 20 mins a day, hour a day, hour a day at night only, splitting 30 mins morning and night, currently decided to do 2 hours a day for a month and take an IQ test after, mainly out of curiosity, and I do not intend on keeping such high levels of practice.
How have you improved?
I averaged 7 back after a year of off and on practicing, and another year of off and on practicing I'm on 9 back. I do not believe that what level you are on means anything, I think the real improvement is how we feel.
Any techniques that allowed you to improve your scores?
Use chunking, the digit span only goes to 7 or 8 anyway, and at the speed of DNB it will naturally be cut shorter. Sleep well. Take antioxidants and minerals so that your brain isn't in a state of inflammation and can actually be used.
Were there any supplements that you saw a discernible improvement on?
Anything dopaminergic should improve scores. DNB training is proven to increase D1 receptors in the prefrontal cortex on its own. I noticed that after a day of intermittent fasting (which makes catecholamines skyrocket, expecially norepinephrine) I scored well on 9 back for the first time. I was amazed. Norepinephrine does activate the prefrontal cortex and will improve your scores, but I don't think that is a good thing. I think a more efficient pre-frontal cortex is the goal, one that can be dormant and called to attention when needed is optimal. For example jazz musicians and rappers and artists have a quieter pre-frontal cortex when being creative, it is as if the PFC is doing its job but not getting in the way by making noise and ruining the act of improvisation. A norepinephrine loaded PFC may be too loud and sparky for creativity to shine from other parts of the brain.
Edited by Arjuna, 27 September 2014 - 08:26 PM.