Study type: Medical/biological study (experimental study)

[Hypersensitivity to Electricity]. med./bio.

Gibt es Elektrosensibilität im D-Netzbereich: Ein 3-AFC-Doppelblindversuch.

Published in: Umweltmed Forsch Prax 1998; 3 (3): 125-129

Aim of study (acc. to author)

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).

Endpoint

Exposure

Exposure Parameters
Exposure 1: 900 MHz
Modulation type: pulsed
Exposure duration: repeated exposure with intermittent stimulus (3 x 2 min on/10 s off) for 12 times in one day

General information

Double-blind provocation experiments using 3-AFC procedure (3-Alternative Forced Choice)

Exposure 1

Main characteristics
Frequency 900 MHz
Type
Exposure duration repeated exposure with intermittent stimulus (3 x 2 min on/10 s off) for 12 times in one day
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
Exposure setup
Exposure source
Distance between exposed object and exposure source 1.9 m
Setup 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 info 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.
Parameters
Measurand Value Type Method Mass Remarks
power density 0.24 W/m² unspecified unspecified - -

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • during exposure

Main outcome of study (acc. to author)

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.

Study character:

Study funded by

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