http://www.bnet.com/2403-13242_23-383397.html

“The brain hates uncertainty,” says David Rock, the CEO of Results Coaching Systems and author of “Your Brain at Work.” “It’s literally painful to not download your email the moment you arrive at your desk in the morning. But once you’ve processed 30 or 40 emails, you’ve ruined your brain chemistry for higher level tasks that are going to create value.”

In fact, a University of London study done for Hewlett-Packard found that “infomania” — a term connected with addiction to email and texting — can lower your IQ by twice as much as smoking marijuana. Moreover, email can raise the levels of noradrenaline and dopamine in your brain by constantly introducing new stimuli into your day. When those levels get too high, complex thinking becomes more difficult, making it harder to make decisions and solve problems — key roles for all managers.