Actions of pulsed ultra-broadband electromagnetic irradiation on the EEG and sleep in laboratory animals.
Irradiation of animals with ultrashort impulses of ultra-broadband magnetic irradiation with an impulse repetition frequency of 6 Hz for 1 h induced changes in the spectral composition of cerebral cortex electrical activity in rats, measured over the 5 min immediately after irradiation, as compared with controls. In particular, there was suppression of frequencies close to the impulse sequence frequency, along with a decrease in interhemisphere coherence. Continuous recording of polygrams for 22 h from rabbits after irradiation revealed a "delayed" effect--a significant increase in paradoxical sleep, starting 16 h after the end of irradiation and persisting to the end of the recording period. It is suggested that irradiation has a direct action both on the mechanisms of generation of the theta rhythm (septohippocampal) and on the system controlling circadian rhythms (the suprachiasmatic nucleus-epiphysis system).
Petrova
E V
EV
Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, 117865 Moscow, Russia.
Gulyaeva
N V
NV
Titarov
S I
SI
Rozhnov
Yu V
YV
Koval'zon
V M
VM
D000161:Acoustic Stimulation / Q000379:methods; D000818:Animals; D002540:Cerebral Cortex / Q000502:physiology / Q000528:radiation effects*; D004569:Electroencephalography / Q000528:radiation effects*; D004576:Electromyography / Q000379:methods; D011817:Rabbits; D011827:Radiation; D051381:Rats; D017208:Rats, Wistar; D011930:Reaction Time / Q000502:physiology / Q000528:radiation effects; D012890:Sleep / Q000502:physiology / Q000528:radiation effects*; D013057:Spectrum Analysis; D018709:Statistics, Nonparametric; D013997:Time Factors