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To study the effects of an electromagnetic field as emitted by a 902 MHz mobile phone on human short term memory.
The study was a replication with methodological improvements (multi-centre testing and a double-blind study design) to a previous study (publication 4728). A total of 64 subjects in two independent laboratories performed a short term memory task.
|ばく露時間||continuous for 65 min|
|Pulse width||577 µs|
|Repetition frequency||217 Hz|
Discontinuous transmission mode was not activated.
|Distance between exposed object and exposure source||0.0337 m|
|ばく露装置の詳細||The mobile phone was mounted on the left side of the subject's head in the normal position of use with an adjustable rubber head cap. The antenna was located over the left posterior temporal lobe. The distance from the surface of the skull was measured in 12 randomly selected subjects, averaging 33.7 mm (SD 2.57 mm).|
|Additional information||Each subject performed the tasks twice, once under the exposure to a mobile phone and once under a sham exposure. These sessions were separated by 24 ± 1 h. Both the subjects and the experimenters were unaware of the exposure condition (double blind).|
No statistically significant differences in performance between the two laboratories were found. The authors could not replicate the previous results: the electromagnetic field had no effect on reaction times or on the accuracy of the subjects' answers. The inability to replicate previous results could have been caused by lack of actual electromagnetic field effects or the magnitude of effects being at the sensitivity threshold of the test used.