Slow potentials and spike unit activity of the cerebral cortex of rabbits exposed to microwaves

Чиженкова, Р. А.

doi:10.1002/bem.2250090403

Cited by 27 publications

(19 citation statements)

References 8 publications

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“…Despite extensive research in the field of low-level microwave effects on the nervous system during recent decades (Johnson and Guy, 1972;Bawin et al, 1973;Baranski and Edelwejn, 1975;Gavalas-Medici and Day-Magdaleno, 1976;Chizhenkova, 1988;Mann and Roschke, 1996;Vorobyov et al, 1997;Wagner et al, 1998;Lutty et al, 2000), the reports of possible effects are often contradictory and the mechanisms behind the effects are still unclear. The difficulties in independent repeating of the experimental results cause doubt in these effects.…”

Section: Thermal and Non-thermal Effectsmentioning

confidence: 96%

“…Several investigators have reported that microwave exposure produces different alterations in the EEG signal: an increase in the number of slow rhythms in the EEG of rabbits (Chizhenkova, 1988), modulated at brain rhythm frequencies EMF affect EEG patterns in the cat (Bawin et al, 1973), a significant elevation of the EEG hemispheric asymmetry during the first 20 seconds of the stimulation period (Vorobyov et al, 1997).…”

Section: Thermal and Non-thermal Effectsmentioning

confidence: 99%

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Non-Thermal Effect of Microwave Radiation on Human Brain

et al. 2005

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This study focuses on an origin of interaction mechanism of microwave radiation with nervous system-quasi-thermal field effect. The microwave field can cause fluctuations and vibration of the charged particles and membranes in tissues. The hypothesis is, that this phenomenon is similar to the effect caused by Brown motion initiated by temperature and results in the same effects without rise in temperature. The electric field of 1 V/cm can introduce disturbance of the thermal equilibrium inside a cell of 10 µm radius, which is equivalent to disturbance produced by temperature rise of 1 K. The hypothesis, that microwave heating should cause an effect independent of the microwave modulation frequency, while field effect depends on modulation frequency, was examined experimentally. The 450 MHz microwave radiation, modulated at 7, 14 and 21 Hz frequencies, power density at the skin 0.16 mW/cm 2 , was applied. The experimental protocol consisted of two series of five cycles of the repetitive microwave exposure at fixed modulation frequencies. Relative changes in EEG theta, alpha and beta rhythms of the group of 13 healthy volunteers were analysed. Analysis of the experimental data shows that:(1) statistically significant changes in EEG rhythms depend on modulation frequency of the microwave field; (2) microwave stimulation causes an increase of the EEG energy level; (3) the effect is most intense at beta1 rhythm and higher modulation frequencies. These findings confirm the quasi-thermal origin of the effect, different from average heating.

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Section: Thermal and Non-thermal Effectsmentioning

confidence: 96%

Section: Thermal and Non-thermal Effectsmentioning

confidence: 99%

Non-Thermal Effect of Microwave Radiation on Human Brain

et al. 2005

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“…The changes analyzed in this study for brain signals in different sleep-wake states are found in agreement with previous published reports. 10,12,23,33,50 However, from literature review, it is evident that the changes in EEG frequencies are highly dependent on the exposure frequency, time of exposure, and the modulation frequency. Thus, in these conditions, the findings of the present study for EEG power spectrum analysis are unique.…”

Section: Discussionmentioning

confidence: 96%

Neural Network-Based Evaluation of Chronic Non-Thermal Effects of Modulated 2450 MHz Microwave Radiation on Electroencephalogram

et al. 2008

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The effects of chronic exposure (2 h daily for 21 days) of 1 kHz square wave-modulated 2450 MHz microwave radiation (non-thermal) on sleep-EEG, open field behavior, and thyroid hormones (T(3), T(4), and TSH) have been analyzed in an animal model. Results revealed significant changes in these pathophysiological parameters (p < 0.05 or better), except body temperature, grooming behavior, and TSH levels. The sleep-EEG power spectrum data for slow wave sleep (SWS), rapid eye movement (REM) sleep, and awake (AWA) states in two experimental groups of rats (microwave exposed and the control) were tested by an artificial neural network (ANN), containing 60 nodes in input layer, weighted from power spectrum data from 0 to 30 Hz, 18 nodes in hidden layer and an output node. The target output values for this network were determined with another five-layered neural network (with the structure of 6-14-1-14-6). The input and output of this network was assigned with the six confirmed pathophysiological changes. The most important feature for chronic exposure of 2450 MHz microwave exposure and for control subjects was extracted from the third layer single neuron and used as the target value for the three-layered ANN. The network was found effective in recognizing the EEG power spectra with an average of 71.93% for microwave exposure and 93.13% for control subjects, respectively. However, the lower percentage of pattern identification agreement in the microwave-exposed group in comparison to the control group suggest only mild effects of microwave exposure with this experimental setup.

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“…Microwaves, acting selectively on the nervous tissue, induce substantial electrophysiological and neuromorphological changes in the peripheral, intermediate, and central parts of the visual analyzer [4,7,9,11]. However, the nature of alterations in the synaptic apparatus at different levels of the visual system and their contribution in microwave-induced visual disorders have been little studied.…”

Section: Abstract: Visual Analyzer Synapses Microwavesmentioning

confidence: 99%

Microwave-induced changes in synaptoarchitectonics at different levels of the visual analyzer

Логвинов

1996

Bull Exp Biol Med

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It is shown that interneuronal bonds at different levels of the visual analyzer are highly sensitive to microwaves (60 mW/cm 2, 10 min). Evidence of this is seen from the early degeneration and reduced numerical density of synapses and, in the cortical substance, in the reduced total length of active zones of contacts. The rate of recovery of the synaptic apparatus decreases in the following order: retina ~ external geniculate bodies ~ visual cortex. Key Words: visual analyzer, synapses, microwavesMicrowaves, acting selectively on the nervous tissue, induce substantial electrophysiological and neuromorphological changes in the peripheral, intermediate, and central parts of the visual analyzer [4,7,9,11]. However, the nature of alterations in the synaptic apparatus at different levels of the visual system and their contribution in microwave-induced visual disorders have been little studied.The aim of the present study was to investigate the degree of damage and the dynamics of reparir in the synaptoarchitectonics in the retina, external geniculate bodies (EGB), and visual cortex (VC) after a single irradiation with microwaves of thermogenic intensity. MATERIALS AND METHODSExperiments were performed on 62 mature randombred guinea pigs of both sexes. Thirty-six of these animals were exposed to whole-body lateral microwave radiation (60 mW/cm 2, 2375 MHz frequency, 12.6 cm wavelength) during 10 min in an echoproof chamber, the longitudinal axis of the animal being parallel to the magnetic vector of the electromagnetic wave. Measurements on multichamber phantoms showed that the specific absorbed power accounted for about 8 W/kg. Sham-irradiated guinea pigs served as controls and were kept together with the experimental animals under the same vivarium conditions with the usual illumination regime.The animals were perfused with 2.5% glutaraldehyde in 0.1 M phosphate buffer (pH 7.4) a few minutes, 6 hours, and 1, 5, 10, 25, and 60 days after irradiation. The dorsal ocular wall and dorsal nuclei of the EGB and VC were removed for electron microscopy. Control materials were obtained simultaneously. The materials were postfixed in 1% osmium tetroxide and embedded in araldite. For selective analysis of the paramembrane specialilzation of subsynaptic units the dehydrated objects were contrasted with phosphotungstic acid (PTA) without preliminary treatment with osmium tetroxide [2,5]. Ultrathin slices were prepared with an LKB-3 ultratome, contrasted with uranyl acetate and lead citrate, and examined and photographed with a JEN-100 CX-2 electron microscope.For quantitative synaptoarchitectonic study 12-15 visual fields of the medial zone of the internal pleximorph layer of the central retinal areas, as well as of the dorsal nuclei of the EGB and layer IV of the VC from each irradiated and control animal were photographed. Electron microphotograms with a final magnification of 30,000 and with a neuropil area of 45 ~2 were obtained. The numerical density of synapses and the percentage of reactively and destructively altered cont...

show abstract

Slow potentials and spike unit activity of the cerebral cortex of rabbits exposed to microwaves

Cited by 27 publications

References 8 publications

Non-Thermal Effect of Microwave Radiation on Human Brain

Non-Thermal Effect of Microwave Radiation on Human Brain

Neural Network-Based Evaluation of Chronic Non-Thermal Effects of Modulated 2450 MHz Microwave Radiation on Electroencephalogram

Microwave-induced changes in synaptoarchitectonics at different levels of the visual analyzer

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