To examine the effects of the mobile phone electromagnetic fields on EEG and event-related potentials. The aim was to study in particular patients with narcolepsy in an effort to explore the interaction between vigilance and the effects of the pulsed mobile phone field. In a double-blind study, these patients had the visual event-related potentials recorded during their 45 min exposure.
|Exposure duration||continuous for 45 min|
|Exposure room||The patients were examined in the supine position in a darkened room.|
|Setup||The mobile phone was fixed to the right ear using a special holder. The phone was thermally insulated from the head with a textile case and the electrode cap. It was not possible to recognise the state of exposure.|
|Additional info||The patients were examined in a double blind study on two successive days with 50% of them per day being exposed or sham exposed.|
There were no alterations of the EEG recorded after the mobile phone exposure. The reaction time was shortened by 20 ms in response to all target stimuli. The mobile phone field might effectively inhibit the excessive sleepiness which is assumed to be, in narcolepsy, an active process. This may correspond with evidence of improved performance while solving monotonous cognitive task requiring sustained attention. With regard to the fact that the subjects of the group were exclusively patients with narcolepsy, it is difficult to decide whether the mobile phone exposure's positive effect on visual event-related potential was due to the narcoleptics' enhanced sensibility or whether this was the result of the general effects of a high frequency electromagnetic field associated with the given type of cognitive task.