In the OSC paths explanation part, it is said that the value of 1 on “/muse/elements/experimental/concentration” means when your attention is directed at something very particular and with high intensity. (https://sites.google.com/a/interaxon.ca/muse-developer-site/museio/osc-paths/osc-paths---v3-6-0)
However, when I observe this concentration level, I find that every time when my friend is reading an article or doing maths, this value will go down, and even keeps 0 for lots of seconds. Even though during his reading, this value may fluctuate several times, go up and down, but I can still apparently see the trend of this value goes down when my friend focuses.
And when my friend is talking to me or when he is doing nothing, this value will go up to 0.9 or even higher.
I tried this experiment on different individuals for several times, but the conclusion was the same: the value went down when they focus, and went up when they are not working.
So, I guess maybe the truth is just opposite to the explanation on your website. But I still want to make sure about it.