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To study the possible effects of the electromagnetic fields emitted by an GSM mobile phone on brainstem auditory processing in 17 healthy young adults.
Auditory brainstem response (ABR) was recorded first without a mobile phone at baseline, and then under real exposure and sham exposure in a counterbalanced order. During exposure/sham exposure, the mobile phone was placed directly on the ears, one ear at a time.
experiments were conducted under three conditions: i) baseline = auditory stimuli only ii) auditory stimuli + mobile phone on the stimulated ear on iii) auditory stimuli + mobile phone on the stimulated ear off
|ばく露時間||5 min sessions for 1 h|
|Pulse width||0.58 µs|
|Repetition frequency||217 Hz|
additional auditory stimuli (clicks) with a rate of 10.3 HZ and a duration of 100 µs
|ばく露装置の詳細||tubal insert phone electrodes inserted into the ear canals of the subjects, three Ag-AgCl-electrodes (1 ground, 2 reference) attached to the forehaed, mobile phone placed directly on the ear; additional auditory stimuli conducted through thin flexible silicon tubes and polyurethane foam eartips wrapped in thin gold foil|
|Sham exposure||A sham exposure was conducted.|
Auditory brainstem response waveforms showed no significant differences due to exposure, suggesting that short-term exposure to mobile phone electromagnetic fields did not affect the transmission of sensory stimuli from the cochlea up to the midbrain along the auditory nerve and brainstem auditory pathways.