Neurologically speaking, though, there are reasons we develop a confused sense of priorities when we’re in front of our computer screens. For one thing, email comes at unpredictable intervals, which, as B. F. Skinner famously showed with rats seeking pellets, is the most seductive and habit-forming reward pattern to the mammalian brain. (Think about it: would slot machines be half as thrilling if you knew when, and how often, you were going to get three cherries?)
