title: Effects of weak microwave fields amplitude modulated at ELF on EEG of symmetric brain areas in rats.
abstract: Averaged electroencephalogram (EEG) frequency spectra were studied in eight unanesthetized and unmyorelaxed adult male rats with chronically implanted carbon electrodes in symmetrical somesthetic areas when a weak (0.1-0.2 mW/cm) microwave (MW, 945 MHz) field, amplitude-modulated at extremely low frequency (ELF) (4 Hz), was applied. Intermittent (1 min "On," 1 min "Off") field exposure (10-min duration) was used. Hemispheric asymmetry in frequency spectra (averaged data for 10 or 1 min) of an ongoing EEG was characterized by a power decrease in the 1.5-3 Hz range on the left hemisphere and by a power decrease in the 10-14 and 20-30 Hz ranges on the right hemisphere. No differences between control and exposure experiments were shown under these routines of data averaging. Significant elevations of EEG asymmetry in 10-14 Hz range were observed during the first 20 s after four from five onsets of the MW field, when averaged spectra were obtained for every 10 s. Under neither control nor pre- and postexposure conditions was this effect observed. These results are discussed with respect to interaction of MW fields with the EEG generators.
authors.affiliation: Institute of Cell Biophysics, Russian Academy of Science, Pushchino, Russia.
authors.forename: V V
authors.initials: VV
authors.lastname: Vorobyov
authors.forename: A A
authors.initials: AA
authors.lastname: Galchenko
authors.forename: N I
authors.initials: NI
authors.lastname: Kukushkin
authors.forename: I G
authors.initials: IG
authors.lastname: Akoev
mesh_terms: D000818:Animals; D001921:Brain / Q000502:physiology / Q000528:radiation effects*; D004569:Electroencephalography / Q000528:radiation effects*; D004574:Electromagnetic Fields / Q000009:adverse effects*; D004781:Environmental Exposure / Q000009:adverse effects; D008297:Male; D008872:Microwaves / Q000009:adverse effects*; D051381:Rats; D012890:Sleep / Q000502:physiology / Q000528:radiation effects; D013003:Somatosensory Cortex / Q000502:physiology / Q000528:radiation effects