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Radio waves from mobile phones appear to boost activity in parts of the brain that are closest to the devices' antennas, according to US government scientists. Researchers found that a 50-minute call led to a localized increase in brain activity of 7%, but they said there was no evidence to suggest the rise was harmful. To rule out the variation in brain activity that would be expected when someone listens to a call normally, changes in activity were monitored while the phone was taking a call but was muted. The team, led by Nora Volker, director of the National Institute on Drug Abuse in Maryland, found that brain activity rose in line with the strength of the electromagnetic field to which the particular brain region was exposed.

Mobile phones use radio waves to send and receive calls and these produce small electromagnetic fields that can be absorbed by the head and brain.” Although we cannot determine the clinical significance, our results give evidence that the human brain is sensitive to the effects of radio-frequency electromagnetic fields from acute cell phone exposures," Dr Volker said. The study appears in the Journal of the American Medical Association.

The dramatic rise in mobile phone use around the world has prompted concerns about possible harmful effects, including brain tumors. Last year, the much-delayed Interphone report found no hard evidence that mobile phones increase the risk of cancer, but the issue remains unresolved. In the new study, 47 volunteers were given two brain scans, each on different days. The scans, which used a technique called positron emission tomography (PET), were designed to monitor changes in the way the brain metabolized glucose, the fuel it needs to function.

Before being scanned, the volunteers had a mobile phone positioned against each ear. In one scan, both phones were switched off. But in the other scan, the phone on the right ear was switched on, muted, and set to receive a lengthy recorded message. The volunteers were not told which scan was which.

When they compared scans taken in these two different scenarios, Volker’s team discovered a pattern of increased brain activity in the right orbit frontal cortex and the lower parts of the right superior temporal gyres. In these areas of the brain, glucose metabolism rose from 33.3 to 35.7 micromoles of glucose per 100g each minute.

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