Brief exposure to a 50 Hz, 100 μT magnetic field: Effects on reaction time, accuracy, and recognition memory

Podd, John; Abbott, Jeana; Kazantzis, Nikolaos; Rowland, Al

doi:10.1002/bem.10004

Cited by 34 publications

(31 citation statements)

References 19 publications

(17 reference statements)

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“…Kazantzis et al [1998] showed, on the same task, a small statistical improvement in accuracy, but relaxed the alpha level from the conventional P ¼.05 to P ¼.30. These results, however, were not reproduced by Podd et al [2002].…”

Section: Introductioncontrasting

confidence: 77%

Absence of daytime 50 Hz, 100 μT_rms magnetic field or bright light exposure effect on human performance and psychophysiological parameters

Crasson

Legros

2005

Bioelectromagnetics

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The purpose of this study was to reproduce and extend two earlier studies of the effects of human exposure to 50 Hz magnetic fields (MF). In a recent paper, we described results of two double-blind investigations performed to examine effects of 100 microT(rms) 50 Hz MF exposure on psychological parameters in the same group of healthy human volunteers. In each exposure session, at 1 week intervals, with sham, continuous, and intermittent (15 s ON/OFF cycles) MF conditions, mood ratings, performance measures, and electrophysiological measures were taken. In the first study, significant amplitude changes were observed in the event-related brain potentials (ERP) recorded during a dichotic listening task. In the second study, latency and reaction time (RT) slowing were seen on a visual discrimination task (P(300) paradigm). Although these results were little related to the number of parameters analysed, they indicate that low level 50 Hz MF might have a slight influence on ERP and RT under specific circumstances of sustained attention. Before concluding that moderately strong MF exposure can influence cognitive function, previous results should be replicated, using the same paradigms with another group of healthy volunteers. In the present study, 18 healthy subjects were exposed to three experimental sessions of 30 min each, given at 1 week intervals. The sessions consisted of continuous 100 microT(rms) 50 Hz MF exposure, sham condition, and bright light (5000 lux) exposure. The study was performed double-blind, with the exposure order counter-balanced. The data on mood, ERP, RT, and other performance measures did not show any differences among the sham exposure, light exposure, and MF exposure conditions. The results of this study do not support the hypothesis that extremely low frequency (ELF) MF exposure affects the brain's electrical activity or cognitive function at field strength (100 microT(rms)) similar to that found in very close proximity of some household and industrial electrical appliances and well in excess of the average MF strength (c. 0.1 microT) found in homes. The sensitivity of the experiment was possibly not sufficient to detect an effect at this relatively low MF, and larger sample sizes would be required in further studies.

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Section: Introductioncontrasting

confidence: 77%

Absence of daytime 50 Hz, 100 μT_rms magnetic field or bright light exposure effect on human performance and psychophysiological parameters

Crasson

Legros

2005

Bioelectromagnetics

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“…Others have failed to find any effects [Kurokawa et al, 2003;Delhez et al, 2004]. Most of these studies, with the exception of Podd et al [2002], do not investigate effects over a longer post-exposure duration. An overview of the results of these studies can be found in Table 3.…”

Section: Studies Involving Performance Measures: Time Course Of Effectsmentioning

confidence: 85%

“…Effects have been noted immediately during the exposure period [Shupak et al, 2004a], and following a delay [Podd et al, 2002]. Others have failed to find any effects [Kurokawa et al, 2003;Delhez et al, 2004].…”

Section: Studies Involving Performance Measures: Time Course Of Effectsmentioning

confidence: 93%

“…Attempting to replicate the Whittington et al [1996] study, Podd et al [2002] used the same visual duration discrimination task to assess the effects of a 50 Hz 100 mT MF exposure (1 s on, 1 s off) in 80 subjects. Although they were unable to replicate the reaction time effect found in , they did find a significant decrease in recognition memory performance in subjects exposed to the MF.…”

Section: Studies Involving Performance Measures: Time Course Of Effectsmentioning

confidence: 99%

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Exposure to ELF magnetic and ELF‐modulated radiofrequency fields: The time course of physiological and cognitive effects observed in recent studies (2001–2005)

Cook

Saucier

Thomas

et al. 2006

Bioelectromagnetics

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In 2002, we published a review of the cognitive and physiological effects of extremely low frequency magnetic fields (ELF MFs) and ELF-modulated radiofrequency fields associated with mobile phones. Since the original preparation of that review, a significant number of studies have been published using techniques such as electroencephalography, event-related potentials and positron emission tomography to investigate electromagnetic field effects upon human physiology and various measures of performance (cognitive, perceptual, behavioral). We review these recent studies, and when effects were observed, we reference the time course of observed effects (immediate or delayed). In our concluding remarks, we discuss a number of variables that are not often considered in human bioelectromagnetics studies, such as personality, individual differences and the specific laterality of ELF MF and mobile phone exposure over the brain. We also consider the sensitivity of various physiological assays and performance measures in the study of biological effects of electromagnetic fields.

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“…Some few researchers have focused on MF effects on electrical activity of brain, where the cognitive and perceptual effects of MF exposure were explored [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Analysis of EEG rhythms under local sinusoidal ELF magnetic field exposure: An approach to neurofeedback enhancement on attention performance

Mehran¹,

Firoozabadi²,

Rostami³

2013

JBiSE

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Although there is no consensus with respect to that if exposed Extremely Low Frequency Magnetic Field (ELF-MF) affects human brain activity for guidelines of brain management, there are some evidences related with human attention changes. Therefore, this study evaluates the effects of 45 Hz sinusoidal ELF (360 μT) at Cz regions, cantered at dominant frequency using Electroencephalogram (EEG) analysis. The purpose was to extracte transient or permanent events as an index for new neurofeedback (NF) system improvement. Twenty-four healthy volunteers aged between 20 and 28 years of age were randomly assigned to one of two groups, which differed in the type of NF training concerning the exposed and non-exposed magnetic field effect on performance in attention tests during NF. Results indicate that theta and beta EEG rhythms variations in exposed group changed more significantly in comparison of traditional NF (P < 0.05). These results suggest a new design of NF system.

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Brief exposure to a 50 Hz, 100 μT magnetic field: Effects on reaction time, accuracy, and recognition memory

Cited by 34 publications

References 19 publications

Absence of daytime 50 Hz, 100 μT_rms magnetic field or bright light exposure effect on human performance and psychophysiological parameters

Absence of daytime 50 Hz, 100 μT_rms magnetic field or bright light exposure effect on human performance and psychophysiological parameters

Exposure to ELF magnetic and ELF‐modulated radiofrequency fields: The time course of physiological and cognitive effects observed in recent studies (2001–2005)

Analysis of EEG rhythms under local sinusoidal ELF magnetic field exposure: An approach to neurofeedback enhancement on attention performance

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Brief exposure to a 50 Hz, 100 μT magnetic field: Effects on reaction time, accuracy, and recognition memory

Cited by 34 publications

References 19 publications

Absence of daytime 50 Hz, 100 μTrms magnetic field or bright light exposure effect on human performance and psychophysiological parameters

Absence of daytime 50 Hz, 100 μTrms magnetic field or bright light exposure effect on human performance and psychophysiological parameters

Exposure to ELF magnetic and ELF‐modulated radiofrequency fields: The time course of physiological and cognitive effects observed in recent studies (2001–2005)

Analysis of EEG rhythms under local sinusoidal ELF magnetic field exposure: An approach to neurofeedback enhancement on attention performance

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Resources

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Absence of daytime 50 Hz, 100 μT_rms magnetic field or bright light exposure effect on human performance and psychophysiological parameters

Absence of daytime 50 Hz, 100 μT_rms magnetic field or bright light exposure effect on human performance and psychophysiological parameters