As part of the test, one phone was activated but muted for fifty minutes. The other phone was off. After that, the people were tested with both phones turned off. Dr. Volkow says the brain scans showed increased activity in brain cells closest to the activated phone.
NORA VOLKOW: "This right area of the brain that was very close to the antenna shows the largest increase in metabolism as compared when the telephones were off. Even though the radio frequencies that are emitted from current cell phone technologies are very weak, they are able to activate the human brain to have an effect.''
The scans showed how the brain cells used sugar to produce energy, a normal activity. The activity was seven percent higher in areas of the brain closest to the cell phone antenna.
The study appeared in the Journal of the American Medical Association.
Experts say people who are concerned about mobile phones can take steps like using a hands-free device.
Dr. Giuseppe Esposito is a nuclear medicine expert at Georgetown University Medical Center in Washington. He says after many years of studies, better kinds of research are still needed to settle questions about cell phone safety. These studies would take years.
GIUSEPPE ESPOSITO: "We need what are called epidemiological studies where you will follow a population using cell phones -- high users or light users -- and then see what happens over the years."
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2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25