One of the leading experts on this topic is Guy Claxton, professor of learning sciences at the University of Winchester, who I went to interview in Sussex, in England. He has analyzed what happens to a person's focus if they engage in deliberately slow practices, like yoga, or tai chi, or meditation, as discovered in a broad range of scientific studies, and he has shown they improve your ability to pay attention by a significant amount. Iasked him why. He said that "we have to shrink the world to fit our cognitive bandwidth." If you go too fast, you overload your abilities, and they degrade. But when you practice moving at a speed that is compatible with human nature- and you build that into your daily life you begin to train your attention and focus. "That's why those disciplines make you smarter. It's not about humming or wearing orange robes." Slowness, he explained, nurtures attention, and speed shatters it.

— Stolen Focus by Johann Hari (Page 36)