Study type: Medical/biological study (experimental study)

Low power radio-frequency and microwave effects on human electroencephalogram and behavior. med./bio.

Published in: Physiol Chem Phys 1978; 10 (5): 387-398

Aim of study (acc. to author)

To identify effects on the human nervous system of low power radiofrequency energy.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 0.1–960 MHz
Modulation type: CW
Exposure duration: continuous for 50 min
Exposure 2: 8.5–9.6 GHz
Modulation type: pulsed
Exposure duration: continuous for 50 min

General information

Each signal source was slowly tuned through its range.

Exposure 1

Main characteristics
Frequency 0.1–960 MHz
Type
Exposure duration continuous for 50 min
Additional info Woman were tested within the 250 to 960 MHz range only.
Modulation
Modulation type CW
Exposure setup
Exposure source
Distance between exposed object and exposure source 1 m
Chamber Tests were made at various locations inside and outside of a Faraday shielded room that was 6 m square and 2.5 m high. Shielding consisted of two welded-seam sheet iron walls 10.2 cm apart.
Setup Subjects were seated (usually with their eyes closed) such that they could not see equipment or operator and did not know the exposure conditions. The antenna was a 1 m wire rod monopole supported by a wooden yardstick. It was placed parallel to and 1 m from the upper torso and head on the left side. (Right side, left rear, and right rear were tried but effects were negligible.)
Additional info The dial accuracy of the generators was within 5%.
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 0.067 mV/m mean measured - -

Exposure 2

Main characteristics
Frequency 8.5–9.6 GHz
Type
Exposure duration continuous for 50 min
Modulation
Modulation type pulsed
Duty cycle 25 %
Repetition frequency 125 kHz
Additional info

2 µs on/6 µs off

Exposure setup
Exposure source
Distance between exposed object and exposure source 1 m
Setup Subjects were either standing or sitting with their eyes closed 1 m from the open waveguide output oriented perpendicular to the sternum at the level of the 5th intercostal space.
Additional info Frequency-range accuracy and pulse wave shapes of the generator were inconsistent and values could only be used as close approximations.
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 1.95 mV/m mean measured - -

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • during exposure

Main outcome of study (acc. to author)

The results suggest that very low power density radiofrequency can interfere with the normal brain-wave patterns of humans. And if these patterns are meaningful in terms of mood and behavior, then radiofrequency affects these parameters as well. Since the relaxation frequency of protein-bound water is considered to fall between 100 and 1000 MHz, absorptions and quantum effects may be the mechanistic basis for the EEG changes revealed in most of the subjects produced by 10-15 W/cm² CW (continuous wave) radiofrequency energy of between 130 and 960 MHz.

Study character:

Study funded by

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