Study type: Medical/biological study (experimental study)

Cognitive effects of cellular phones: A possible role of non-radiofrequency radiation factors. med./bio.

Published in: Bioelectromagnetics 2011; 32 (7): 585-588

Aim of study (acc. to editor)

To study the effects of exposure to radiofrequency irradiation, emitted by GSM cellular phones, on cognitive functions of humans. The study was a follow-up of previous studies (Eliyahu et al. 2006 and Luria et al. 2009) with a modified exposure set-up (with external antennas away from the body of the subjects to exclude effects of radiofrequency).

Background/further details

29 healthy males (right-handed) were divided into two groups: 1) exposure to the left side of the head (15 subjects) and 2) exposure to the right side of the head (14 subjects). All partcipants performed a spatial working memory task (that required either a left-hand or a right-hand response; three blocks of 50 trials).

Endpoint

Exposure

Exposure Parameters
Exposure 1: 890.2 MHz
Exposure duration: not specified in the article

General information

Test persons were divided into two groups: i) exposure at the left side of the head ii) exposure at the right side of the head

Exposure 1

Main characteristics
Frequency 890.2 MHz
Type
Exposure duration not specified in the article
Exposure setup
Exposure source
Distance between exposed object and exposure source 2 m
Setup two mobile phones attached to both sides of the head by a non-conductive frame in a position similiar to normal use; internal antenna positioned 1.5 cm away from the head; to exclude RF signals at the head, the phone's internal antenna was disabled and the signal was transmitted through an external remote antenna which was connected to the phone via a cable; phones silent during the test
Parameters
Measurand Value Type Method Mass Remarks
power 2 W peak value measured - -
power density 0.1 µW/cm² - measured - at the subject's head
SAR 0.54 W/kg minimum measured - -
SAR 1.09 W/kg maximum measured - -

Reference articles

  • Luria R et al. (2009): Cognitive effects of radiation emitted by cellular phones: the influence of exposure side and time.

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

Despite the different exposure setup with external antennas, the data remained similar to those obtained in the previous work (Eliyahu et al. 2006 and Luria et al. 2009): During the first block, the average reaction time of the right-hand responses under left-side exposure showed a trend for longer reaction times relative to the right-side exposure. These results indicate that some of the effects previously attributed to radiofrequency could be the result of some confounders (e.g. non-radiofrequency heating or low frequency magnetic field caused by the battery).

Study character:

Study funded by

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