Googling "Flow" brings up multiple articles pertaining to this that I cannot link because of newbstatus.
Reading through these few articles, I am interested. I have experienced this "Heightened level of concentration" before. I always referred to it as being "in the zone". It has always felt to me as if I have done something to my utmost best that I possibly could, almost as if I was watching through my own eyes, as if something else was controlling me. Call it strange if you will but that is how I have felt.
I firmly believe that this state exists and its not a load of rubbish, however its extremely hard to experience, and oftentimes when you realise you are in said zone, you snap out, generally in amazement of what you have probably just accomplished.
Do you believe? Do you have any tricks or methods to getting into that feel, the zone?