RF Safe

Cellular phone electromagnetic field effects on bioelectric activity of human brain.

Critical reviews in biomedical engineering · 2000 · Mixed · Low evidence

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MixedLow evidencePaper 5340

In EEG recordings from 24 volunteers, the multichannel (global) correlation dimension significantly increased during cellular phone EMF exposure and in the post-exposure period, with a more pronounced effect during the "eyes closed" condition.

Study snapshot

PublicationCritical reviews in biomedical engineering · 2000
Study typerandomized_trial
Reported directionMixed
Evidence ratingLow

Abstract

24 volunteers participated in the experiments. The investigation of EEG reactions to cellular phone (EMF frequency 902.4 MHz and intensity 0.06 mW/cm2) was conducted. Two experiments were performed with each subject--cellular phone exposure and Placebo Duration of the experiment was 60 min: 15 min--background; 15 min--EMF exposure or Placebo; 30 min--afterexposure. EEG was recorded in 16 standard leads with "eyes open" and "eyes closed". Special software with non-linear dynamics was developed for EEG analyses. One parameter, multichannel (global) correlation dimension, was calculated. The changes of these parameters can be evidence of brain functional state changes. As a result of EEG record processing, a significant increase of global correlation dimension during the exposure and afterexposure period was discovered, more pronounced in the case of "eyes closed". That can be viewed as the manifestation of cortex activation under phone EMF exposure.

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
Population24 volunteers
Sample size24
ExposureRF · 902.4 MHz · 15 min exposure within a 60 min session (15 min baseline, 15 min exposure/placebo, 30 min post-exposure)
Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

In EEG recordings from 24 volunteers, the multichannel (global) correlation dimension significantly increased during cellular phone EMF exposure and in the post-exposure period, with a more pronounced effect during the "eyes closed" condition.

Outcomes measured

  • EEG bioelectric activity (multichannel/global correlation dimension)

Limitations

  • No SAR reported (only intensity given: 0.06 mW/cm2).
  • Only one EEG-derived parameter (global correlation dimension) is reported in the abstract.
  • Volunteer characteristics (e.g., age/sex/health status) not described in the abstract.
  • Randomization/blinding procedures not described in the abstract.
View raw extracted JSON
{
  "study_type": "randomized_trial",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": 902.4,
    "sar_wkg": null,
    "duration": "15 min exposure within a 60 min session (15 min baseline, 15 min exposure/placebo, 30 min post-exposure)"
  },
  "population": "24 volunteers",
  "sample_size": 24,
  "outcomes": [
    "EEG bioelectric activity (multichannel/global correlation dimension)"
  ],
  "main_findings": "In EEG recordings from 24 volunteers, the multichannel (global) correlation dimension significantly increased during cellular phone EMF exposure and in the post-exposure period, with a more pronounced effect during the \"eyes closed\" condition.",
  "effect_direction": "mixed",
  "limitations": [
    "No SAR reported (only intensity given: 0.06 mW/cm2).",
    "Only one EEG-derived parameter (global correlation dimension) is reported in the abstract.",
    "Volunteer characteristics (e.g., age/sex/health status) not described in the abstract.",
    "Randomization/blinding procedures not described in the abstract."
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "cellular phone",
    "RF EMF",
    "902.4 MHz",
    "EEG",
    "correlation dimension",
    "non-linear dynamics",
    "cortex activation",
    "placebo"
  ],
  "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: 10.1615/critrevbiomedeng.v28.i12.450
PubMed: 10999398

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