In 2005, a psychiatrist at King's College in London administered IQ tests to three groups: the first did nothing but perform the IQ test, the second was distracted by email and ringing phones, and the third was stoned on marijuana.
Not surprisingly, the first group did better than the other two by an average of 10 points. The emailers, on the other hand, did worse than intoxicated people by an average of 6 points. ("Can't Get No Satisfaction," New York Magazine, Dec. 4, 2006)
Yet, in a recent survey of 320 professionals, 17% check a few times per hour and 68% check email more or less continually--constantly breaking their focus on the primary task at hand.
http://www.thefreelibrary.com/Optimizing+email:+stay+productive,+not+busy.-a0197492903
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