I believe that would be one of the "indirect methods" that's known and described in the articles as "mental effort". Apparently the person described in the art

I believe that would be one of the "indirect methods" that's known and described in the articles as "mental effort". Apparently the person described in the article can do it without indirect methods, and also "feel" the muscles involved. From what's described it's almost as natural as moving an arm for them.