A new book The Distracted Mind: Ancient Brains in a High Tech World explores the implications of, and brain science behind, this evolution (some might say devolution).It was written Adam Gazzaley, a neurologist and a professor at the University of California, San Francisco, and research psychologist Larry D. Rosen.
http://www.npr.org/sections/ed/2016/11/05/498477634/learning-in-the-age-of-digital-distraction