In a new book, “Irresistible: The Rise of Addictive Technology and the Business of Keeping Us Hooked,” the social psychologist Adam Alter warns that many of us — youngsters, teenagers, adults — are addicted to modern digital products. Not figuratively, but literally addicted.
Dr. Alter, 36, is an associate professor at the Stern School of Business at New York University who researches psychology and marketing. We spoke for two hours last week at the offices of The New York Times. Our conversation has been edited and condensed for clarity and brevity.