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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 Entry , Journal web site )
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.
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.
General category: mobile communication system, mobile phone, GSM
| 890.2 MHz |
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
partial body exposure: head (left or right side)
investigation on living organism
- cognitive/behavioral endpoints:
spatial working memory computer task (reaction to matching [=right hand response] and mismatching [=left hand response] locations of "target faces" with previously presented positions); reaction times and response accurary (in percent)
judgement which phone was operating during the experiment
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 byReplication study of
- Eliyahu I et al. (2006): Effects of radiofrequency radiation emitted by cellular telephones on the...
- Wallace D et al. (2012): Cognitive and physiological responses in humans exposed to a TETRA base station...
- Schmid MR et al. (2012): Sleep EEG alterations: effects of different pulse-modulated radio frequency...
- Mortazavi SM et al. (2012): Human short-term exposure to electromagnetic fields emitted by mobile phones...
- Hareuveny R et al. (2011): Cognitive effects of cellular phones: A possible role of non-radiofrequency...
- Sauter C et al. (2011): Effects of exposure to electromagnetic fields emitted by GSM 900 and WCDMA...
- Riddervold IS et al. (2010): No effect of TETRA hand portable transmission signals on human cognitive...
- Wiholm C et al. (2007): The Effects of 884 MHz GSM Wireless Communication Signals on Spatial Memory...
- Haarala C et al. (2004): 902 MHz mobile phone does not affect short term memory in humans.
- Haarala C et al. (2003): Effect of a 902 MHz electromagnetic field emitted by mobile phones on human...
- Krause CM et al. (2000): Effects of electromagnetic fields emitted by cellular phones on the...
- Koivisto M et al. (2000): The effects of electromagnetic field emitted by GSM phones on working memory.
- Preece AW et al. (1999): Effect of a 915-MHz simulated mobile phone signal on cognitive function in man.
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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