Medical/biological Study (experimental study)
Effects of exposure to electromagnetic fields emitted by GSM 900 and WCDMA mobile phones on cognitive function in young male subjects. med./biol. By: Sauter C, Dorn H, Bahr A, Hansen ML, Peter A, Bajbouj M, Danker-Hopfe H
Published in: Bioelectromagnetics 2011; 32 (3): 179 - 190 ( PubMed Entry , Journal web site )
Aim of study (according to author)
To study possible effects of long-term electromagnetic field exposure to mobile phone handset-like signals (GSM and W-CDMA) on attention and working memory in 30 healthy male subjects (18-30 years old).
The subjects were tested on nine study days (separated by two week intervals) in which they were exposed to three exposure conditions (sham exposure, GSM and W-CDMA) in a randomly assigned and balanced order. All tests were presented twice (morning and afternoon) on each study day within a fixed timeframe.
General category: mobile communication system, mobile phone, GSM, UMTS, W-CDMA
|field 1: 900 MHz |
exposure duration: 3 days (à 7 h 15 minutes), separated by at least two week intervals
|power: 1 W (input power)|
SAR: 7.82 W/kg (10 g)
|field 2: 1966 MHz |
exposure duration: 3 days (à 7 h 15 minutes), separated by 2-week intervals and not necessarily consecutive
|power: 1 W (input power)|
SAR: 10.98 W/kg (10 g)
FIELD View further expo parameters
partial body exposure: head
investigation on living organism
- cognitive/behavioral endpoints: attention (reaction time and number of correct responses in different tests: divided attention (Test for Attentional Performance (TAP): dual task test involving simultaneous attention to two different stimuli), selective attention (sustained attention task of the Vienna Test) and vigilance (TAP)) and working memory (n-back task: 0-back task and 2-back task)
investigated organ system: brain/CNS
time of investigation: before, during and after exposure
Main outcome of study (according to author)
Univariate comparison (t-test or Wilcoxon test) revealed significant changes when subjects were exposed to GSM exposure (higher number of correct reactions and shorter reaction time in the morning trial) compared to sham exposure, only in the vigilance test. In the W-CDMA exposure condition, one parameter in the vigilance (higher number of correct reactions) and one in the test on divided attention (slower reaction time in the morning session) were altered compared to sham exposure. Performance in the selective attention test and the n-back task was not affected by GSM or W-CDMA exposure. Time-of-day effects were evident for the tests on divided and selective attention, as well as for working memory.
After correction for multiple testing (Bonferroni inequality), only time-of-day effects remained significant in two tests, resulting in faster reactions in the afternoon trials.
The authors conclude, that the data do not provide any evidence of an electromagnetic field effect on human cognition, but they underline the necessity to control the paramter time-of-day.
(Study character: medical/biological study, experimental study, full/main study, double-blind study, cross-over study)
Study funded by
- Bundesamt für Strahlenschutz (BfS; Federal Office for Radiation Protection), Salzgitter, Germany
- Deutsches Mobilfunk Forschungsprogramm (DMF; German Mobile Phone Research Programme) at Federal Office for Radiation Protection (BfS)
- Loughran SP et al. (2013): No increased sensitivity in brain activity of adolescents exposed to mobile...
- Wallace D et al. (2012): Cognitive and physiological responses in humans exposed to a TETRA base station...
- Vecchio F et al. (2012): Mobile phone emission modulates event-related desynchronization of alpha...
- Mortazavi SM et al. (2012): Human short-term exposure to electromagnetic fields emitted by mobile phones...
- Schmid MR et al. (2012): Sleep EEG alterations: effects of different pulse-modulated radio frequency...
- Hareuveny R et al. (2011): Cognitive effects of cellular phones: A possible role of non-radiofrequency...
- Valentini E et al. (2010): Systematic review and meta-analysis of psychomotor effects of mobile phone...
- Eltiti S et al. (2009): Short-term exposure to mobile phone base station signals does not affect...
- Luria R et al. (2009): Cognitive effects of radiation emitted by cellular phones: the influence of...
- Wiholm C et al. (2009): Mobile phone exposure and spatial memory.
- Kleinlogel H et al. (2008): Effects of weak mobile phone - electromagnetic fields (GSM, UMTS) on event...
- Riddervold IS et al. (2008): Cognitive function and symptoms in adults and adolescents in relation to rf...
- Unterlechner M et al. (2008): No effect of an UMTS mobile phone-like electromagnetic field of 1.97 GHz on...
- Barth A et al. (2008): A meta-analysis for neurobehavioural effects due to electromagnetic field...
- Cinel C et al. (2008): Does the use of mobile phones affect human short-term memory or attention?
- Haarala C et al. (2007): Pulsed and continuous wave mobile phone exposure over left versus right...
- Regel SJ et al. (2007): Pulsed radio frequency radiation affects cognitive performance and the waking...
- Cinel C et al. (2007): Effects of mobile phone electromagnetic fields on an auditory order threshold...
- Terao Y et al. (2006): Effects of thirty-minute mobile phone use on visuo-motor reaction time.
- Keetley V et al. (2006): Neuropsychological sequelae of digital mobile phone exposure in humans.
- Wilen J et al. (2006): Psychophysiological tests and provocation of subjects with mobile phone related...
- Eliyahu I et al. (2006): Effects of radiofrequency radiation emitted by cellular telephones on the...
- Russo R et al. (2006): Does acute exposure to mobile phones affect human attention?
- Regel SJ et al. (2006): UMTS base station-like exposure, well-being, and cognitive performance.
- Preece AW et al. (2005): Effect of 902 MHz mobile phone transmission on cognitive function in children.
- Sienkiewicz Z et al. (2005): Neurobehavioural effects of electromagnetic fields.
- Haarala C et al. (2005): Electromagnetic field emitted by 902 MHz mobile phones shows no effects on...
- Maier R et al. (2004): Zur Wirkung gepulster elektromagnetischer Felder geringer Leistungen auf...
- Haarala C et al. (2004): 902 MHz mobile phone does not affect short term memory in humans.
- Maier R et al. (2004): Effects of pulsed electromagnetic fields on cognitive processes - a pilot study...
- Hinrichs H et al. (2004): Effects of GSM electromagnetic field on the MEG during an encoding-retrieval...
- Haarala C et al. (2003): Effect of a 902 MHz electromagnetic field emitted by mobile phones on human...
- Smythe JW et al. (2003): Mobile phone use facilitates memory in male, but not female, subjects.
- Lee TM et al. (2003): The effect of the duration of exposure to the electromagnetic field emitted by...
- Edelstyn N et al. (2002): The acute effects of exposure to the electromagnetic field emitted by mobile...
- Koivisto M et al. (2000): Effects of 902 MHz electromagnetic field emitted by cellular telephones on...
- Preece AW et al. (1999): Effect of a 915-MHz simulated mobile phone signal on cognitive function in man.
- Eibert T et al. (1997): Untersuchung biologisch-zerebraler Effekte in niederfrequent gepulsten...
Glossary: 3G, attention, behavioral, biological, Bonferroni, brain, CNS, cognition, cross-over study, double-blind study, electromagnetic field, endpoint, evident, exposed, exposure, full/main study, GSM, healthy, human, mobile communication, mobile phone, n-back task, organism, partial body exposure, power, randomly, reaction time, SAR, session, sham exposure, signals, significant, stimuli, subjects, t-test, UMTS, vigilance, W-CDMA, Wilcoxon test, working memory
Exposure: mobile communication system, mobile phone, GSM, UMTS, W-CDMA
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