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To study the effects of a mobile phone on regional cerebral blood flow in 12 healthy humans during exposure to electromagnetic field, while performing a verbal working memory task.
A substantially more sensitive experimental design (concerning the exposure) than in a previous study (publication 10384) was used.
Discontinuous mode was not activated.
|Distance between exposed object and exposure source
|The phone was placed between the subject`s head and the head rest of a positron emission tomography (PET) scanner parallel to the medial plane. The antenna was located circa 17 mm from the surface of the skull over the subject`s left inferior temporal lobe.
|A sham exposure was conducted.
|In order to eliminate audio clues the phone`s loudspeaker was removed and its battery was removed. It was operated with an external power source located 3 m away. The subjects were asked to insert an ear plug into the left ear. The EMF/sham exposure was started at the same moment as the transmission scan. After a 9 min transmission scan, each subject was scanned 14 times, out of which the first or the last seven scans were obtained during a constant EMF or sham exposure.
The data suggest that the electromagnetic field emitted by a mobile phone affects regional cerebral blood flow in humans. The results revealed that a mobile phone in operation induces a local decrease in regional cerebral blood flow beneath the antenna in the inferior temporal cortex and an increase more distantly in the prefrontal cortex.
The electromagnetic field had no effects on reaction times or the accuracy of responses in the working memory task.