Electromagnetic field of mobile phones affects visual event related potential in patients with narcolepsy

Jech, Robert; Šonka, Karel; Růžička, Evžen; Nebuželský, Antonín; Böhm, Jiří; Juklíčková, Michaela; Nevšímalová, Soňa

doi:10.1002/bem.81.abs

Cited by 9 publications

(11 citation statements)

References 25 publications

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“…In addition, the increase of EEG power during sleep included a broader frequency range after bstat exposure (Borbély et al, 1999;Huber et al, 2000) than after handset exposure (Huber et al, 2002). Thus, inconsistent results in the analysis of event-related brain potentials during RF EMF exposure might be in part related to differences in the modulation paradigms (Eulitz et al, 1998;Freude et al, 1998;Jech et al, 2001).…”

Section: Discussionmentioning

confidence: 99%

“…In recent studies, however, previously reported changes in cognitive functioning could not be replicated (Haarala et al, 2003b;Krause et al, 2004). Also, the analysis of event-related brain potentials during RF EMF exposure revealed conflicting results (Eulitz et al, 1998;Freude et al, 1998;Jech et al, 2001). It is possible that some inconsistencies are related to the spectral content of the applied RF EMF.…”

Section: Introductionmentioning

confidence: 94%

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Exposure to pulse‐modulated radio frequency electromagnetic fields affects regional cerebral blood flow

Huber

Treyer

Schuderer

et al. 2005

Eur J of Neuroscience

134

108

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We investigated the effects of radio frequency electromagnetic fields (RF EMF) similar to those emitted by mobile phones on waking regional cerebral blood flow (rCBF) in 12 healthy young men. Two types of RF EMF exposure were applied: a 'base-station-like' and a 'handset-like' signal. Positron emission tomography scans were taken after 30 min unilateral head exposure to pulse-modulated 900 MHz RF EMF (10 g tissue-averaged spatial peak-specific absorption rate of 1 W/kg for both conditions) and sham control. We observed an increase in relative rCBF in the dorsolateral prefrontal cortex on the side of exposure. The effect depended on the spectral power in the amplitude modulation of the RF carrier such that only 'handset-like' RF EMF exposure with its stronger low-frequency components but not the 'base-station-like' RF EMF exposure affected rCBF. This finding supports our previous observation that pulse modulation of RF EMF is necessary to induce changes in the waking and sleep EEG, and substantiates the notion that pulse modulation is crucial for RF EMF-induced alterations in brain physiology.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Exposure to pulse‐modulated radio frequency electromagnetic fields affects regional cerebral blood flow

Huber

Treyer

Schuderer

et al. 2005

Eur J of Neuroscience

134

108

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“…The authors hypothesized that RF EMF exposure modulates the response of EEG oscillatory activity around 8 Hz specifically during cognitive processing . In a recent study in narcoleptics, effects of RF EMF exposure on visual event-related potentials were observed and reaction times were reduced [Jech et al, 2001].…”

Section: Introductionmentioning

confidence: 98%

Radio frequency electromagnetic field exposure in humans: Estimation of SAR distribution in the brain, effects on sleep and heart rate

Huber

Schuderer²,

Graf

et al. 2003

Bioelectromagnetics

109

110

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In two previous studies we demonstrated that radiofrequency electromagnetic fields (RF EMF) similar to those emitted by digital radiotelephone handsets affect brain physiology of healthy young subjects exposed to RF EMF (900 MHz; spatial peak specific absorption rate [SAR] 1 W/kg) either during sleep or during the waking period preceding sleep. In the first experiment, subjects were exposed intermittently during an 8 h nighttime sleep episode and in the second experiment, unilaterally for 30 min prior to a 3 h daytime sleep episode. Here we report an extended analysis of the two studies as well as the detailed dosimetry of the brain areas, including the assessment of the exposure variability and uncertainties. The latter enabled a more in depth analysis and discussion of the findings. Compared to the control condition with sham exposure, spectral power of the non-rapid eye movement sleep electroencephalogram (EEG) was initially increased in the 9-14 Hz range in both experiments. No topographical differences with respect to the effect of RF EMF exposure were observed in the two experiments. Even unilateral exposure during waking induced a similar effect in both hemispheres. Exposure during sleep reduced waking after sleep onset and affected heart rate variability. Exposure prior to sleep reduced heart rate during waking and stage 1 sleep. The lack of asymmetries in the effects on sleep EEG, independent of bi- or unilateral exposure of the cortex, may indicate involvement of subcortical bilateral projections to the cortex in the generation of brain function changes, especially since the exposure of the thalamus was similar in both experiments (approx. 0.1 W/kg).

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“…It was also found to be specific to the side of the brain directly exposed to the field. Similarly, in narcoleptic patients, Jech et al [2001] reported effects on two specific components of the EEG evoked by the presentation of rare (oddball) stimuli on the right half of the visual field. Field-dependent changes in the EEG have been reported in healthy volunteers exposed to pulsed 902 MHz fields during performance of either an auditory task or a visual memory task .…”

Section: Effects On the Eegmentioning

confidence: 94%

Neurobehavioural effects of electromagnetic fields

Sienkiewicz¹,

Jones²,

Bottomley³

2005

Bioelectromagnetics

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Very few laboratory studies in children have explored the effects of exposure to low level electromagnetic fields (EMFs) on neurobehavioural function. Studies investigating effect on neurotransmitters, cognitive function and brain activity in adults and animals indicate that acute exposure to EMFs does not appear to engender any consistent physiological or behavioural impairment although a few subtle effects may occur. This suggests that exposure of children to low level EMFs may not cause significant detrimental effects on brain function. However the available evidence is not sufficient to draw any definite conclusions, and further laboratory studies are required. In particular, experiments investigating the effects of radiofrequency (RF) fields on the performance of well-characterised cognitive and behavioural tasks by immature and developing animals are recommended, if studies with children cannot be performed for ethical and practical reasons.

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Electromagnetic field of mobile phones affects visual event related potential in patients with narcolepsy

Cited by 9 publications

References 25 publications

Exposure to pulse‐modulated radio frequency electromagnetic fields affects regional cerebral blood flow

Exposure to pulse‐modulated radio frequency electromagnetic fields affects regional cerebral blood flow

Radio frequency electromagnetic field exposure in humans: Estimation of SAR distribution in the brain, effects on sleep and heart rate

Neurobehavioural effects of electromagnetic fields

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