" That need for surprise is what it’s all about. Surprise is visceral and immediate, and stokes our dopamine and our nucleus accumbens. But it’s fleeting, and rarely does any happiness come out of it. In fact, the frequent checking of cell phones, waiting for something to change, is linked to anxiety and depression.6 Of course, again, correlation is not causation. Do cell phones cause depression? Or are depressed people trying to eke out a little dopamine rush? Or both? I’ll tell you one thing: cell phones certainly don’t bring serenity. "

― Robert H. Lustig , The Hacking of the American Mind: The Science Behind the Corporate Takeover of Our Bodies and Brains