So, every new email you get gives you a little flood of dopamine. Every little flood of dopamine reinforces your brain’s memory that checking email gives a flood of dopamine. And our brains are programmed to seek out things that will give us little floods of dopamine. Further, these patterns of behaviour start creating neural pathways, so that they become unconscious habits: Work on something important, brain itch, check email, dopamine, refresh, dopamine, check Twitter, dopamine, back to work. Over and over, and each time the habit becomes more ingrained in the actual structures of our brains.