Haarala C, Bjornberg L, Ek M, Laine M, et al. (2003):

The authors previously published a study that suggested that exposure to RF radiation from cell phones may enhance cognitive function (Koivisto et al., 2000a). Here they repeated their study but with improved methodology by including double blind testing, larger sample size multicentre testing and additional tests. On this occasion they found that the electromagnetic field had no effect on cognitive functioning.

The testing was conducted in two independent laboratories, one in Finland and the other in Sweden. Each laboratory tested 32 volunteers (16 men; 16 women). None different experimental tasks were performed, including 6 that were used in the previous study. Each subject was exposed to RF radiation from a GSM phone, mounted to the left side of the head so that the position of the earphone was directly over the ear canal and the microphone was directed towards the corner of the mouth. Neither the subject nor the experimenter was aware whether the phone was on or off. When the phone was on, it emitted 902 MHz electromagnetic field (EMF) with a mean power of 0.25 W, pulsed at a frequency of 217 Hz and with a pulse width of 577 µs. The SAR was 0.88 W/kg averaged over 1g with a peak value of 1.2 W/kg.

There were no significant differences between EMF on vs. off in either laboratory. Neither was there any difference in the accuracy of the responses.

The authors point out that most of the studies that have reported an effect from RF radiation on cognitive function have failed to do a statistical adjustment for multiple comparisons. If this had been done, the number of significant results, already small, would have been further reduced.

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