The aim of this study was to replicate an earlier study by the same authors in 2000. The only differences on this occasion were that the present study was double blind and the phone was attached to the left side of the subject's head, rather than the right side.
Twenty-four (12 male) healthy volunteers performed an auditory memory task. Each test period was subdivided into 2 segments, one with the EMF turned off and the other with the EMF on. The EMF exposure order was counterbalanced so that half the subjects had the EMF exposure first. Neither the subject nor the investigator was aware of the status of the exposure. Electroencephalographic (EEG) tracings were recorded during the testing procedures.
The EMF was from a 902 MHz phone, pulsed with a frequency of 217 Hz and a pulse width of 0.557 msec. The SAR value averaged over 10 g of tissue was 0.648 W/kg.
mean percentage of incorrect answers for EMF was significantly increased.
This had not been the case in the authors' earlier study.
The authors could not explain the different results between the two studies.