Study type: Medical/biological study (experimental study)

No influence on selected parameters of human visual perception of 1970 MHz UMTS-like exposure. med./bio.

Published in: Bioelectromagnetics 2005; 26 (4): 243-250

Aim of study (acc. to author)

To study possible effects of exposure to a generic 1.97 GHz UMTS-like signal on human visual perception.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 1.97 GHz
Exposure duration: see add. information
  • SAR: 0.63 W/kg mean (1 g) (0.25-1.49 W/kg)
  • SAR: 0.37 W/kg mean (10 g) (0.16-0.84 W/kg)

Exposure 1

Main characteristics
Frequency 1.97 GHz
Type
Exposure duration see add. information
Modulation
Modulation type cf. additional info
Additional info

Generic UMTS test signal developed for use in bio-electromagnetic experiments (see reference article) and representing a wideband code division multiple access (WCDMA) signal at a carrier frequency close to the uplink frequency band of UMTS in frequency division duplex (FDD) mode. Due to simulated fading and power control, the signal envelope contained low frequency components of 8-12 and 1,500 Hz.

Exposure setup
Exposure source
Exposure room laterally shielded exposure cabin with the inner surface covered by pyramidal RF absorbing material
Setup Test subjects wore a special head set consisting of a modified stereo head phone (all metallic parts removed) with small matched helical antennas mounted in a way to achieve an exposure distribution in the head similar to the case of mobile phone usage. Subjects were exposed only at the left side of the head, but they were not informed about this fact.
Additional info Each subject was tested on a single week day between 3:30 and 7:00 p.m. and underwent four tests used for assessing visual perception under three different exposure conditions (high exposure, low exposure, and sham exposure) that were controlled randomly and double-blinded by control software. Additionally, all tests except the Critical Flicker and Fusion Frequency Test were presented to the subjects under a positive control condition (flicker light applied from the back) at the end of the subject's session.
Parameters
Measurand Value Type Method Mass Remarks
SAR 0.63 W/kg mean measured and calculated 1 g 0.25-1.49 W/kg
SAR 0.37 W/kg mean measured and calculated 10 g 0.16-0.84 W/kg

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

Statistical evaluation of the obtained data revealed no statistically significant differences in the investigated parameters of visual perception between the exposure conditions and sham exposure.

Study character:

Study funded by

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