Following an acclimation period, there were two experimental periods during which either a fieId or a sham exposure was presented. The order of exposure/sham exposure varied randomly from subject to subject.
|Exposure duration||80 trials of 3 s - 0.7 ms on - 2.9993 s off|
|Modulation type||single pulse|
|Pulse width||0.7 ms|
A pulse of the type produced by mobile phones was transduced by 90% of the subjects, as indicated by the occurrence of evoked potentials. The implication of the data is that mobile phones trigger evoked potentials at the frequency of 217 Hz during ordinary cell phone use.
The authors conclude that chronic production of the changes in brain activity might be pertinent to the reports of health hazards among mobile phone users.