RF Safe

Comparison of the effects of continuous and pulsed mobile phone like RF exposure on the human EEG.

Australasian physical & engineering sciences in medicine · 2007 · No effect · Low evidence

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No effectLow evidencePaper 3419

In a fully counterbalanced cross-over design with 12 participants exposed for 15 minutes, no changes in post-exposure resting EEG alpha power were found for either modulated (pulsed) or unmodulated RF fields. No effects were demonstrated on non-linear EEG fea…

Study snapshot

PublicationAustralasian physical & engineering sciences in medicine · 2007
Study typerandomized_trial
Reported directionNo effect
Evidence ratingLow

Abstract

It is not clear yet whether Global System for Mobiles (GSM) mobile phone radiation has the ability to interfere with normal resting brain function. There have been reports that GSM exposure increases alpha band power, and does so only when the signal is modulated at low frequencies (Huber, R., Treyer, V., Borbely, A. A., Schuderer, J., Gottselig, J. M., Landolt, H.P., Werth, E., Berthold,T., Kuster, N., Buck, A and Achermann, P. Electromagnetic fields, such as those from mobile phones, alter regional cerebral blood flow and sleep and waking EEG. J Sleep Res 11, 289-295, 2002.) However, as that research employed exposure distributions that are not typical of normal GSM handset usage (deep brain areas were overexposed), it remains to be determined whether a similar result patterning would arise from a more representative exposure. In this fully counterbalanced cross-over design, we recruited 12 participants and tried to replicate the modulation linked post exposure alpha band power increase described above, but with an exposure source (dipole antenna) more closely resembling that of a real GSM handset. Exposures lasted for 15 minutes. No changes to alpha power were found for either modulated or unmodulated radiofrequency fields, and thus we failed to replicate the above results. Possible reasons for this failure to replicate are discussed, with the main reason argued to be the lower and more representative exposure distribution employed in the present study. In addition we investigated the possible GSM exposure related effects on the non-linear features of the resting electroencephalogram using the Approximate Entropy (ApEn) method of analysis. Again, no effect was demonstrated for either modulated or unmodulated radiofrequency exposures.

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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 directionno_effect
Population12 human participants
Sample size12
ExposureRF · 15 minutes
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

In a fully counterbalanced cross-over design with 12 participants exposed for 15 minutes, no changes in post-exposure resting EEG alpha power were found for either modulated (pulsed) or unmodulated RF fields. No effects were demonstrated on non-linear EEG features assessed by Approximate Entropy for either exposure condition.

Outcomes measured

  • Resting EEG alpha band power (post-exposure)
  • Non-linear EEG features (Approximate Entropy, ApEn)

Limitations

  • Small sample size (n=12)
  • Frequency and SAR/exposure level not reported in the abstract
  • Short exposure duration (15 minutes)
  • Only resting EEG outcomes assessed
View raw extracted JSON
{
  "study_type": "randomized_trial",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "15 minutes"
  },
  "population": "12 human participants",
  "sample_size": 12,
  "outcomes": [
    "Resting EEG alpha band power (post-exposure)",
    "Non-linear EEG features (Approximate Entropy, ApEn)"
  ],
  "main_findings": "In a fully counterbalanced cross-over design with 12 participants exposed for 15 minutes, no changes in post-exposure resting EEG alpha power were found for either modulated (pulsed) or unmodulated RF fields. No effects were demonstrated on non-linear EEG features assessed by Approximate Entropy for either exposure condition.",
  "effect_direction": "no_effect",
  "limitations": [
    "Small sample size (n=12)",
    "Frequency and SAR/exposure level not reported in the abstract",
    "Short exposure duration (15 minutes)",
    "Only resting EEG outcomes assessed"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "GSM",
    "mobile phone",
    "radiofrequency",
    "RF exposure",
    "modulated",
    "pulsed",
    "unmodulated",
    "continuous",
    "EEG",
    "alpha power",
    "Approximate Entropy",
    "ApEn",
    "cross-over"
  ],
  "suggested_hubs": [
    {
      "slug": "mobile-phones-rf",
      "weight": 0.9,
      "reason": "Study tests GSM-like mobile phone RF exposure effects on human EEG."
    }
  ]
}
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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: 10.1007/bf03178437
PubMed: 18274067

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