International Journal of Biometeorology

, Volume 25, Issue 1, pp 63–69 | Cite as

Influence of air ions on brain activity induced by electrical stimulation in the rat

  • J. M. Olivereau
  • J. F. Lambert
  • A. Truong-Ngoc


The brain induced activity was studied in 18 rats wearing chronically skull implanted electrodes. The stimulating factor was various electrical stimulations of the mesencephalic reticular activating formation, given during the slow wave state of sleep. The results of 300 stimulations were measured by amplitude and frequency changes in the EEG simultaneously recorded. Animals previously exposed to positive air ions (3 weeks 80,000 ions/ml) exhibited lowered excitability of the reticulocortical system. Significantly higher stimulations were necessary to induce arousal. Negative air ions induced more intricate effects: brain excitability was lowered when tested with weak stimulations, but normal when evaluated with medium high level stimilations. Sleep seems first more stable but as stimulation increases, arousal is soon as effective as in controls. These results are in agreement with others findings in behavioral fields and partly explains them.


Electrical Stimulation Slow Wave Stimulate Factor Wave State Environmental Medicine 
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Copyright information

© Swets & Zeitlinger B.V. 1981

Authors and Affiliations

  • J. M. Olivereau
  • J. F. Lambert
  • A. Truong-Ngoc
    • 1
  1. 1.Laboratoire de PsychophysiologieUniversité Pierre et Marie CurieParis Cedex 05France

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