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Via Hanna:
Multitasking has been found to increase the production of the stress hormone cortisol as well as the fight-or-flight hormone adrenaline, which can overstimulate your brain and cause mental fog or scrambled thinking.  
His research found that being in a situation where you are trying to concentrate on a task, and an email is sitting unread in your inbox, can reduce your effective IQ by 10 points.  
Wilson showed that the cognitive losses from multitasking are even greater than the cognitive losses from pot‑smoking.
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