The auditory P50 component of event-related potentials reflects pre-attentive processing and working memory operation.
The P50 evoked by two warning stimuli (500 and 3000 Hz) has been assessed in 19 subjects (10 women and 9 men) both without and with exposure to a 900 MHz signal.
|Exposure duration||not specified|
|Distance between exposed object and exposure source||20 cm|
|Setup||Subjects sat in an anatomical chair, and the antenna was fixed near their right ear.|
|Sham exposure||A sham exposure was conducted.|
|Additional info||The subjects attended two sessions, with and without radiation, in random order and with an interval of two weeks.|
The data showed that the presence of mobile phone electromagnetic fields induced statistically significant increase in the amplitude of P50 evoked by the lower frequency stimuli. In contrast the exposure revealed statistically significant decrease of the amplitude of P50 evoked by the higher frequency stimuli.
Memory performance did not differ between the frequency modalities (lower frequency/higher frequency tone).
These results provide evidence that the electromagnetic fields emitted by mobile phone affect pre-attentive information processing as it is reflected in P50 evoked event-related potential.