Reason #1. Lower IQ
A study conducted at the Institute of Psychiatry found that multitasking (usually in the form of incoming e-mail and phone calls) lowers your IQ by as much as 10 points.
Reason #2. Shrinks your brain(?!)
As though a lower IQ wasn’t enough reason to put the phone on silent, there’s reason to believe that the cognitive impairment from multitasking isn’t temporary. Research suggests that repeated multitasking can alter the structure of your brain over time...