Tim Harford — Article — Why you should check email less often, and how to do it

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One reason is that email would probably be less habit-forming when taken in bigger, rarer doses. The psychologist BF Skinner once found himself running out of food pellets for one of his projects, which like many of his experiments involved rats pushing levers to receive rewards. To eke out his supply of pellets, Skinner restricted their release: rats would get no more than one pellet a minute, no matter how often they tapped the lever. Rather than discouraging the rats, this intermittent reinforcement soon had them hooked. These days, we’re the rats, the computer is our Skinner Box, and email is our intermittently released food pellet.
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