Portable Addiction Machines

We get a buzz in more ways than one when our phone vibrates.
"The smartphone is the world's smallest slot machine," says Dr. David Greenfield, founder of the Center for Internet and Technology Addiction and an assistant clinical professor of psychiatry at University of Connecticut's medical school.   "Every time you go on to that smartphone and check something, there is an unpredictability about what you're going to find, when you're going to find it and how good it's going to be for you."That feeling of surprise and reward becomes irresistible and keeps you coming back for more.