To study potential effects of GSM 1800 electromagnetic fields on verbal memory encoding by recording event-related magnetic fields from the brain (electrocortical magnetic fields caused by sensory, motor, or psychic events; measured via MEG) during subsequent memory retrieval.
After encoding words from a study list presented in the first phase (under exposure) subjects had to discriminate old from new words mixed together in a test list presented during the second phase (without exposure).
|Repetition frequency||217 Hz|
|Chamber||The subjects were seated in a wooden chair in the center of a chamber (2 x 1.8 x 2 m) the walls of which were covered by foam pads preventing reflections.|
|Setup||A GSM like signal was generated by a signal generator and fed to the antenna of a mobile phone which was located close to the left ear of the subjects in the 30° position according to CENELEC.|
|Additional info||Each subject performed the experiment twice with either EMF or sham exposure (double blind) on separate days.|
Exposure to electromagnetic fields changed an early (350-400 ms) task-specific component of the event-related magnetic fields indicating an interference of electromagnetic fields and item encoding. Behavioural measures (reaction times, the rate of correctly detected new and correctly identified old words) were not significantly affected. Adverse health effects cannot be derived from these results.