Lass J, Tuulik V, Ferenets R, Riisalo R, et al.

One hundred students performed three tests of cognitive function. The students were randomly assigned to two groups, one of which was exposed to 7 Hz-modulated 450 MHz electromagnetic radiation during the performance of the tests. The SAR was between 0.0095 and 0.351 W/kg, depending on the method used for calculation. The students were unaware of their exposure status. The tests had different degrees of complexity, and measured attention and short-term memory.

In the two more difficult tasks the only significant differences were that the exposed group had greater variance in errors. In the first, most complex, task the exposed also had a greater tendency to have errors in their performance, but this was not statistically significant. In the other task, deemed to be less difficult, the exposed group had significantly less errors.

It is difficult to interpret these results. The authors conclude that 7 Hz-modulated microwave radiation has different effects on cognitive tasks of different complexity levels. They state that "these effects might cause a decrease in the number of errors for less complicated neuropsychological tasks and an increase in the errors for more complicated ones".

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