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To study the effects of electromagnetic fields emitted by mobile phones on the 1 - 20 Hz event-related brain oscillatory EEG responses in children performing an auditory memory task.
The stimuli were 8 acoustically presented Finnish nouns.
|ばく露時間||continuous for 30 min|
|Pulse width||0.577 ms|
|Repetition frequency||217 Hz|
|Distance between exposed object and exposure source||20 mm|
|ばく露装置の詳細||A standard GSM phone was mounted to the participant's head over the left posterior temporal region, comparable to normal use, with the antenna located about 20 mm from the head. The phone's loudspeaker was removed and the battery was replaced with a quieter one to prevent acoustic cues about the state of the phone.|
|Sham exposure||A sham exposure was conducted.|
|Additional information||Each EEG recording was subdivided into two 30-min segments, with the mobile phone turned on or off in a double-blind, counterbalanced protocol. The phone's condition was set by software on a computer via a cable disconnected before mounting.|
The data indicate that electromagnetic fields emitted by mobile phones have effects on brain oscillatory responses in children in the approximately 4 - 8 Hz and approximately 15 Hz EEG frequencies during cognitive processing.
The results do not allow any conclusions concerning the possible effects of long-term mobile phone use on cognition or health. The physiological mechanism underlying these effects on brain oscillatory responses remain unclear.