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To study the influence of electromagnetic fields emitted by cellular phones on preparatory slow brain potentials in two experiments, about 6 months apart.
Preparatory slow brain potentials occur prior to voluntary initiated movements (Bereitschaftspotenzial, BP) or between a warning (S1) and an imperative stimulus (S2) (contingent negative variation, CNV). Preparatory processes are of fundamental importance for effective motor and mental performance in the goal-directed behaviour.
CNV: In the current study the appearance of a pointer of a symbolised clock at the 12 o'clock position represented the S1 stimulus, the beginning of the pointer movement represented the S2 stimulus (as soon as the pointer started to move, the subjects had to stop the pointer by pressing a mouse key).
BP: To investigate the BP the subjects were asked to press a key with their right index finger 30 times at self-paced intervals (simple finger movements).
|ばく露時間||continuous for about 3 to 4 min per task|
|Pulse width||577 µs|
|Repetition frequency||217 Hz|
no acoustic signal transmission
|ばく露装置の詳細||The mobile phone was positioned in direct contact to the left ear of the subjects, who sat in an artificially illuminated room in front of a computer monitor. The telephone antenna was fed by a generator and amplifier located in an adjacent room and connected via a coaxial cable.|
|Additional information||Each task was performed in two blocks with and without EMF exposure in counterbalanced order.|
In the first experiment, a significant decrease of slow brain potentials was found during exposure to electromagnetic fields in a complex visual monitoring task and this effect was replicated in the second experiment. No significant electromagnetic field effects were found in the Bereitschaftspotenzial and CNV tasks. The results accounted for a selective electromagnetic field effect on particular aspects of human information processing. However, they do not indicate any influence on human well-being and health.