Edition No. 23/E January 2006
„High frequency GSM-1800 fields with various modulations and field strengths: No short term effect on
human awake EEG”
Prof. Prof. Dr. H. Hinrichs und H.J. Heinze, Otto-von-Guericke-University Magdeburg
Several studies recently reported partly contradictory results regarding potential effects of electromagnetic fields (EMF) of digital mobile phone on human awake electroencephalogram (EEG) and on sleep profile. The reason for these inconsistencies may be the different characteristics of the EMF applied in the experiments. The aim of the present study was to illuminate the influence of modulation frequency and field strength on potential EEG alterations induced by EMF according to the GSM 1800 standard. For this purpose we conducted a double blind placebo controlled study with 18 healthy human subjects. They were exposed to EMF emitted by a GSM mobile phone at 1/4, 1, 2 and 8 W peak power being pulse modulated at either 217, 108, 27 or 0 Hz (i.e. CW). The corresponding specific absorption rate (SAR (10g)) was approximately 0.61 W/kg or 1.25 W/ kg respectively. During exposition of four minutes no immediate alterations of the EEG in terms of spectral components were detected.