We really don't know, but then we really don't know how anyone controls their brain to perform an action.
"Sean Mackey", OBE (1918–1997) was an Irish engineering professor.More Sean Mackey on Wikipedia.
And then when they would focus their attention away they would see that the brain activity would go down.
We believe these subjects and patients really learned to control their brain and, through that, their pain...Pain has a huge impact on individual patients, their families and society. I got incredibly jazzed by the results. We could change people's lives. However, significantly more science and testing must be done before this can be considered a treatment for chronic pain.