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Medical/biological Study (experimental study)

Cognitive effects of radiation emitted by cellular phones: the influence of exposure side and time. med./biol.

By: Luria R, Eliyahu I, Hareuveny R, Margaliot M, Meiran N
Published in: Bioelectromagnetics 2009; 30 (3): 198 - 204 (PubMed | Journal website)

Aim of study (according to author)
To examine time dependence effects of exposure to radiofrequency irradiation, emitted by GSM cellular phones, on cognitive functions of humans. The authors aimed to replicate and extend a previous study (publication 12887); especially to examine time-dependency and slowing of the left-hand response as results of the previous study.
Background/further details:
48 healthy males (right-handed) were divided into three groups: 1) exposure to the left side of the head, 2) exposure to the right side of the head, 3) sham exposure. All partcipants performed a spatial working memory task (that required either a left-hand or a right-hand response; 12 blocks of 50 trials). By averaging the reaction times separately for each block, the time course of the radiofrequency irradiation effect could be assessed.

Endpoint

Exposure
General category: mobile communication system, mobile phone, GSM

Field characteristicsParameters
890.2 MHz
pulsed (PW)
exposure duration: 1 h
power: 2 W peak value
power: 0.25 W average over time
SAR: 0.54 W/kg min value
SAR: 1.09 W/kg max value

FIELD View further expo parameters

Exposed system:
human
partial body exposure: head (left or right side)

Methods
Endpoint/Measurement parameters/Methodology

investigation on living organism
investigated organ system: brain/CNS

time of investigation: during exposure

Main outcome of study (according to author)
During the first two time blocks, the average reaction time of the right-hand responses [matching condition] was significantly longer under left-side exposure than under right-side exposure and sham exposure averaged together. This result confirms an effect of exposure on reaction times. Left-hand responses [mismatching condition] showed the same pattern, but it was non-significant. The participants failed to judge which phone was operating during the experiment.
Although the present results confirmed some findings from the previous study (e.g. time dependency of reaction times), differences between the present results and previous findings may be due to the following factors: exposure duration, responding hand, side of exposure, and differences in the cognitive tasks. These factors may have major influence on the detection of radiofrequency irradiation effects.

(Study character: medical/biological study, experimental study, full/main study, blind study)

Study funded by

Replication study of  iRelated articles i
Glossary: behavioral, biological, blind study, brain, cellular phones, CNS, cognitive, computer, emitted, endpoint, exposure, full/main study, GSM, healthy, human, irradiation, matching, mobile communication, organism, partial body exposure, power, pulsed, PW, radiofrequency, reaction time, SAR, sham exposure, significant, working memory
Exposure: mobile communication system, mobile phone, GSM

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