Besset A, Espa F, Dauvilliers Y, Billiard M, et al. (2005)
The aim of this study was to investigate the effect on cognitive function of daily exposure to radiofrequency radiation (RFR) from a mobile phone (MP) for several weeks.
Fifty-five healthy volunteers (27 men) took part. They were divided into two groups: the first had the MP switched on and the second had the MP switched off. The groups were matched for age, gender, and general intelligence. The study lasted 45 days, and was divided into 3 periods: a baseline period (BLP) lasted for 3 days, an exposure period (EP) for 28 days, and a recovery period (RP) for 14 days. Neuropsychological tests were done during BLP, twice during EP, and on day 45 of RP. A battery of 22 tests were done, and these fell into 4 broad categories of information processing, attention capacity, memory function, and executive function. The RFR exposure was double-blind. The MP-on group had 2 hours exposure a day for 5 days/week to a 900 MHz field pulsed with a frequency of 217 Hz and a pulse width of 0.576 ms. The SAR, assessed by four measurements with a phantom, was 0.54 W/kg. The neuropsychological testing was performed 13 hours after the previous exposure. During RP all subjects were sham-exposed.
There was no effect of the exposure on any of the tests of cognitive function. A period effect was seen, in that the subjects improved in their responses between the BLP and EP, presumably as a result of practice. There was no difference, however, between the responses of the MP-on and MP-off groups.
In the authors' "Discussion" there is a useful review of the results of previous studies of cognitive function.