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To study the effect of electromagnetic fields from the GSM mobile phone system on human brain function.
15 subjects (7 men, 8 women) participated and each subject was investigated during exposure and sham exposure condition.
|ばく露時間||continuous for 20 min.|
|チャンバの詳細||darkened soundproof chamber|
|ばく露装置の詳細||mobile phone fixed with a plastic holder in a position typical for receiving phone calls and was connected to an external microprocessor; the call was simulated by directly wiring the phone to a tape-recorder which played a pre-recorded voice message|
|Sham exposure||A sham exposure was conducted.|
The data did not reveal statistically significant changes in the latencies of N100, N200, P200 waves (that precede the P300 wave) nor in the latency of the P300 wave itself during and after the exposure to 935 MHz electromagnetic fields in relation to respective pre-exposure values. Also in the sham exposure measurement series, mean values of those waves did not differ from the original values.
On the other hand, the statistical analysis showed a statistically significant effect on P300 amplitude. Under real exposure conditions P300 amplitude was lower during the exposure (in comparison with sham exposure). Afterwards, the amplitude returned to the pre-exposure value.
The authors conclude that exposure to GSM electromagnetic fields exerts some effects on central nervous system, including its auditory evoked potentials