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Individual changes in human EEG caused by 450 MHz microwave modulated at 40 and 70 Hz

Author

Listed:
  • Maie Bachmann

    (Technomedicum of Tallinn University of Technology)

  • Ruth Tomson

    (Technomedicum of Tallinn University of Technology)

  • Jaan Kalda

    (Tallinn University of Technology)

  • Maksim Säkki

    (Tallinn University of Technology)

  • Jaanus Lass

    (Technomedicum of Tallinn University of Technology)

  • Viiu Tuulik

    (Technomedicum of Tallinn University of Technology)

  • Hiie Hinrikus

    (Technomedicum of Tallinn University of Technology)

Abstract

This study was aimed to investigate the changes in the human electroencephalographic (EEG) signal caused by modulated low-level microwaves. The 450 MHz microwave exposure modulated at 40 Hz and 70 Hz frequencies was applied to a group of 15 volunteers. The field power density at the scalp was 0.16 mW/cm2. Ten cycles of the exposure (1 min on and 1 min off) at both modulation frequencies were applied. Analysis of the EEG signal was performed using three different methods: nonlinear method of scaling analysis for length distribution of low variability periods (LDLVP), relative changes in EEG energy (S-parameter) and beta ratio (H-parameter). The analysis revealed significant changes caused by microwave for the whole group (H-parameter method). The exposure caused increase of the EEG beta power (S-parameter method). Statistically significant changes in EEG were detected for four subjects (26.7%) at 40 Hz modulation frequency (LDLVP method).

Suggested Citation

  • Maie Bachmann & Ruth Tomson & Jaan Kalda & Maksim Säkki & Jaanus Lass & Viiu Tuulik & Hiie Hinrikus, 2007. "Individual changes in human EEG caused by 450 MHz microwave modulated at 40 and 70 Hz," Environment Systems and Decisions, Springer, vol. 27(4), pages 511-517, December.
    • Handle: RePEc:spr:envsyd:v:27:y:2007:i:4:d:10.1007_s10669-007-9069-9
    DOI: 10.1007/s10669-007-9069-9
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    References listed on IDEAS

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    1. Säkki, M & Kalda, J & Vainu, M & Laan, M, 2004. "The distribution of low-variability periods in human heartbeat dynamics," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 338(1), pages 255-260.
    2. Hiie Hinrikus & Maie Bachmann & Ruth Tomson & Jaanus Lass, 2005. "Non-Thermal Effect of Microwave Radiation on Human Brain," Environment Systems and Decisions, Springer, vol. 25(2), pages 187-194, December.
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    Cited by:

    1. Marko S. Markov, 2012. "Impact of physical factors on the society and environment," Environment Systems and Decisions, Springer, vol. 32(2), pages 121-130, June.
    2. Anna Suhhova & Maie Bachmann & Jaanus Lass & Deniss Karai & Hiie Hinrikus, 2009. "Effect of modulated microwave radiation on human EEG asymmetry," Environment Systems and Decisions, Springer, vol. 29(2), pages 210-214, June.

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