Bak M, Dudarewicz A, Zmyślony M, Sliwinska-Kowalska M. (2010). Effects of GSM signals during exposure to event related potentials (ERPs). Int J Occup Med Environ Health. 23(2):191-9.
Findings from studies exploring whether or not non-thermal electromagnetic field (EMF) exposures induce functional brain changes are conflicting. Recording auditory event related potentials (ERP) is one of the central nervous system (CNS) functional tests. When processed in the CNS, auditory stimuli produce changes in neuronal functional potentials. The electrical brain activity is recorded, and wave peaks are analyzed in terms of their amplitudes and latencies.
The objective was to study latency and amplitude of P300 wave and latencies of N1, N2 and N3 waves that precede P300, during and after exposure to EMF’s emitted from a GSM mobile phone.
The response to the acoustic stimuli from the auditory cortex was recorded in 15 healthy volunteers (7 men and 8 women). Two measurement sessions were performed: one with true EMF exposure (SAR=0.81 W/kg) and the other with sham exposure. The source of exposure was a mobile phone fixed in a position typical for receiving calls. Duration of exposure was approximately 20 minutes.
There were no significant differences in latencies of P300, N1, N2 and N3 waves during and after the true EMF or sham exposure compared to the respective pre-exposure values. However, P300 amplitude was lower during the true EMF exposure. After termination of exposure, it returned to the pre-exposure value. No such effect was observed during sham exposure.
Interpretation and Conclusion
The authors concluded that “exposure to EMF generated by GSM mobile phones affects CNS, including its auditory event related potentials (ERPs). Further research is required to explain the physiological significance of the observed effects.”