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A double-blind provocative study was carried out by a 3-AFC (Alternative Forced Choice)-method to prove the possible perception of electromagnetic fields as it is emitted from modern digital wireless telecommunication devices (base stations; GSM standard).
Modulation type: pulsed
ばく露時間: repeated exposure with intermittent stimulus (3 x 2 min on/10 s off) for 12 times in one day
Double-blind provocation experiments using 3-AFC procedure (3-Alternative Forced Choice)
|ばく露時間||repeated exposure with intermittent stimulus (3 x 2 min on/10 s off) for 12 times in one day|
|Repetition frequency||217 Hz|
|Distance between exposed object and exposure source||1.9 m|
|ばく露装置の詳細||The test persons sat at a distance of 1.9 m in front of the visible antenna, which was located at about the height (1.2 m) of the subject's head.|
|Additional information||Only the experimenter operating the equipment knew which of the three stimuli presented the EMF. Resting phases (breaks) between the 12 tests were at least 30 min.|
A hypersensitivity to electromagnetic fields could not be confirmed for these subjects because neither the mean of the group nor one of the persons reached the classical perceptive threshold. When the first six tests were compared to the last six no differences could be revealed. Thus, a habituation to the electromagnetic fields or too short breaks between retesting could not be proved.