RF Safe

Effect of low frequency modulated microwave exposure on human EEG: individual sensitivity.

Bioelectromagnetics · 2008 · Mixed · Low evidence

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MixedLow evidencePaper 6467

450 MHz microwave exposure modulated at various low frequencies increased EEG energy. A subset of subjects showed significant relative changes in EEG beta1 power (P3-P4), with affected proportions varying by modulation frequency; no subjects were significantl…

Study snapshot

PublicationBioelectromagnetics · 2008
Study typerandomized_trial
Reported directionMixed
Evidence ratingLow

Abstract

The aim of this study was to evaluate the effect of modulated microwave exposure on human EEG of individual subjects. The experiments were carried out on four different groups of healthy volunteers. The 450 MHz microwave radiation modulated at 7 Hz (first group, 19 subjects), 14 and 21 Hz (second group, 13 subjects), 40 and 70 Hz (third group, 15 subjects), 217 and 1000 Hz (fourth group, 19 subjects) frequencies was applied. The field power density at the scalp was 0.16 mW/cm(2). The calculated spatial peak SAR averaged over 1 g was 0.303 W/kg. Ten cycles of the exposure (1 min off and 1 min on) at fixed modulation frequencies were applied. All subjects completed the experimental protocols with exposure and sham. The exposed and sham-exposed subjects were randomly assigned. A computer also randomly assigned the succession of modulation frequencies. Our results showed that microwave exposure increased the EEG energy. Relative changes in the EEG beta1 power in P3-P4 channels were selected for evaluation of individual sensitivity. The rate of subjects significantly affected is similar in all groups except for the 1000 Hz group: in first group 3 subjects (16%) at 7 Hz modulation; in second group 4 subjects (31%) at 14 Hz modulation and 3 subjects (23%) at 21 Hz modulation; in third group 3 subjects (20%) at 40 Hz and 2 subjects (13%) at 70 Hz modulation; in fourth group 3 subjects (16%) at 217 Hz and 0 subjects at 1000 Hz modulation frequency.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typerandomized_trial
Effect directionmixed
PopulationHealthy volunteers
Sample size66
ExposureRF · 450 MHz · 0.303 W/kg · Ten cycles of exposure (1 min off/1 min on) at fixed modulation frequencies
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

450 MHz microwave exposure modulated at various low frequencies increased EEG energy. A subset of subjects showed significant relative changes in EEG beta1 power (P3-P4), with affected proportions varying by modulation frequency; no subjects were significantly affected at 1000 Hz modulation.

Outcomes measured

  • EEG energy
  • EEG beta1 power (P3-P4 channels)
  • Individual sensitivity to exposure (proportion significantly affected)

Limitations

  • Small sample sizes within each modulation-frequency group
  • Outcome evaluation focused on selected EEG channels (P3-P4) and beta1 band for individual sensitivity
View raw extracted JSON
{
  "study_type": "randomized_trial",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": 450,
    "sar_wkg": 0.303,
    "duration": "Ten cycles of exposure (1 min off/1 min on) at fixed modulation frequencies"
  },
  "population": "Healthy volunteers",
  "sample_size": 66,
  "outcomes": [
    "EEG energy",
    "EEG beta1 power (P3-P4 channels)",
    "Individual sensitivity to exposure (proportion significantly affected)"
  ],
  "main_findings": "450 MHz microwave exposure modulated at various low frequencies increased EEG energy. A subset of subjects showed significant relative changes in EEG beta1 power (P3-P4), with affected proportions varying by modulation frequency; no subjects were significantly affected at 1000 Hz modulation.",
  "effect_direction": "mixed",
  "limitations": [
    "Small sample sizes within each modulation-frequency group",
    "Outcome evaluation focused on selected EEG channels (P3-P4) and beta1 band for individual sensitivity"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "450 MHz",
    "microwave",
    "RF exposure",
    "modulation",
    "EEG",
    "beta1 power",
    "P3-P4",
    "sham exposure",
    "randomized",
    "individual sensitivity",
    "power density",
    "SAR"
  ],
  "suggested_hubs": []
}
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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1002/bem.20415
PubMed: 18452168

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