Washington: Mobile users with their cell phones glued to ears may be getting more than conversation. A 50-minute call boosts activity in brain regions near the ear, a brain-scanning study published in the Journal of the American Medical Association (JAMA) shows.
“This is the first paper that really shows there are changes in the brain,” says bioengineer Henry Lai of the University of Washington in Seattle, who coauthored an editorial published in the same issue of JAMA. Talking on a cell phone pressed to the ear, he says, “is not really safe.”
In the study, researchers measured the brain activity of 47 participants who had pairs of Samsung cell phones strapped to their heads, one on each side. The phone on the left ear was turned off, while the one on the right received a 50-minute recorded message. This phone was kept muted so that the subject didn’t know which phone was on, and also to prevent stimulation of the brain’s hearing center.
A few minutes after the call, a PET scan revealed that brain regions next to the working phone had higher levels of glucose metabolism. The left side of the brain and other areas, even those quite close to the phone, showed no changes. Since active brain cells require glucose, the increase suggests that cell phone radiation is boosting brain activity. “The human brain is sensitive to the electromagnetic radiation that is emitted from cell phones,” says study coauthor Nora Volkow of the National Institute on Drug Abuse in Bethesda, Md.
Glucose metabolism rose in these areas by about 7 percent—an increase typically seen when brain regions become active. For instance, glucose metabolism in the language centers of the brain rises by about 10 percent when a person is talking, Volkow says.
The increase in brain metabolism observed in the experiment may be an underestimate, because cell phones emit more radiation when a person is talking, Lai says. Radiation levels also change depending on the phone type, the distance to the nearest cell phone tower and the number of people using phones in the same area. These variables have prevented scientists from getting good epidemiological evidence about potential health risks of cell phone usage.
The heightened activity may not have any ill effects, or it may be dangerous, particularly with years of heavy cell phone use or in the developing brains of children and teens.
“There are very easy solutions like people can limit their time on the phone, use the speakerphone option, or talk with a hands-free device that’s connected to the phone with a wire,” Volkow said.
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