John Ratey, an associate professor of psychiatry at Harvard University and a specialist on the science of attention, explained that when people use digital devices, they get a quick burst of adrenaline, “a dopamine squirt.” Without it, people grow bored with simpler activities like driving. Mr. Ratey said the modern brain is being rewired to crave stimulation, a condition he calls acquired attention deficit disorder.
“We need that constant pizzazz, the reward, the intensity,” he said. He largely dismisses the argument that people need the time in the car to be productive. “The justification for doing work is just that — a justification to be engaged,” he said.