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http://www.chron.com/cs/CDA/ssistory.mp ... ss/3149157
By KATHRINE JEBSEN MOORE
Bloomberg News
Constant e-mailing and text messaging reduces mental ability by 10 IQ points, a more severe effect than smoking cannabis, by distracting the brain from other tasks, a University of London report showed.
The loss of intelligence and disruption caused by electronic "info-mania," costs companies millions of dollars in lost productivity each year, according to the study by the university's Institute of Psychiatry.
"This is a very real and widespread phenomenon," said Dr. Glenn Wilson, author of the research, in an interview. "Info-mania, if unchecked, will damage a worker's performance by reducing mental sharpness. Companies should encourage a more balanced and appropriate way of working."
The study of 1,000 adults found their intelligence declined as tasks were interrupted by incoming e-mails and texts. The average reduction of 10 IQ points, though temporary, is more than double the four-point loss associated with smoking cannabis. A 10-point drop is also associated with missing a night of sleep, the report said.
Women were less affected than men. Their average decline in IQ was five points, compared with 15 for males, suggesting women are better at multi- tasking, Wilson said.