The Effect of GSM Electromagnetic Field Exposure on the Waking Electroencephalogram: Methodological Influences

Bioelectromagnetics · 2021 · Mixed · Low evidence

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MixedLow evidencePaper 1167

Study snapshot

PublicationBioelectromagnetics · 2021

Study typerandomized_trial

Reported directionMixed

Evidence ratingLow

Abstract

The Effect of GSM Electromagnetic Field Exposure on the Waking Electroencephalogram: Methodological Influences Anna Dalecki, Adam Verrender, Sarah P Loughran, Rodney J Croft. The Effect of GSM Electromagnetic Field Exposure on the Waking Electroencephalogram: Methodological Influences. Bioelectromagnetics. 12 April 2021.doi.org. Abstract Although there is consistent evidence that exposure to radiofrequency electromagnetic fields (RF-EMF) increases the spontaneous resting alpha spectral power of the electroencephalogram (EEG), the reliability of this evidence is uncertain as some studies have also failed to observe this effect. The present study aimed to determine whether the effect of RF-EMF exposure on EEG alpha power depends on whether EEG is derived from eyes open or closed conditions and assessed earlier (<5-min) versus later (>25-min) in the exposure interval. Thirty-six adults participated in three experimental sessions, each involving one exposure: "Sham," "Low," and "High" RF-EMF corresponding to peak spatial specific absorption rates averaged over 10 g of 0, 1, and 2 W/kg, respectively. Resting EEG was recorded at baseline (no exposure), during, and after exposure. Alpha power increase was found to be greater for the eyes open than eyes closed EEG during both the High (P = 0.04) and Low (P = 0.04) RF-EMF exposures. There was also a trend toward it being larger at the end, versus the start of the "High" 30-min exposure (P < 0.01; eyes open condition). This suggests that the use of eyes closed conditions, and insufficient RF-EMF exposure durations, are likely explanations for the failure of some studies to detect an RF-EMF exposure-related increase in alpha power, as such methodological choices decrease signal-to-noise ratios and increase type II error. pubmed.ncbi.nlm.nih.gov

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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 directionmixed

PopulationAdults

Sample size36

ExposureRF · 2 W/kg · 30-min exposure

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

In 36 adults across sham, low, and high GSM RF-EMF sessions (peak spatial SAR over 10 g: 0, 1, 2 W/kg), RF-EMF exposure was associated with increased resting EEG alpha power, with a greater increase for eyes-open than eyes-closed recordings during both high and low exposures (P=0.04 for each). A trend suggested a larger effect later versus earlier in the high 30-min exposure interval (P<0.01; eyes-open condition).

Outcomes measured

Resting EEG alpha spectral power (eyes open vs eyes closed; early vs late in exposure interval)

Limitations

Frequency not reported in the provided abstract/metadata.
Methodological factors (eyes open/closed; timing within exposure) appear to influence detectability of effects, implying potential variability across study designs.

View raw extracted JSON

{
  "study_type": "randomized_trial",
  "exposure": {
    "band": "RF",
    "source": "GSM",
    "frequency_mhz": null,
    "sar_wkg": 2,
    "duration": "30-min exposure"
  },
  "population": "Adults",
  "sample_size": 36,
  "outcomes": [
    "Resting EEG alpha spectral power (eyes open vs eyes closed; early vs late in exposure interval)"
  ],
  "main_findings": "In 36 adults across sham, low, and high GSM RF-EMF sessions (peak spatial SAR over 10 g: 0, 1, 2 W/kg), RF-EMF exposure was associated with increased resting EEG alpha power, with a greater increase for eyes-open than eyes-closed recordings during both high and low exposures (P=0.04 for each). A trend suggested a larger effect later versus earlier in the high 30-min exposure interval (P<0.01; eyes-open condition).",
  "effect_direction": "mixed",
  "limitations": [
    "Frequency not reported in the provided abstract/metadata.",
    "Methodological factors (eyes open/closed; timing within exposure) appear to influence detectability of effects, implying potential variability across study designs."
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "GSM",
    "RF-EMF",
    "electroencephalogram",
    "EEG",
    "alpha power",
    "specific absorption rate",
    "eyes open",
    "eyes closed",
    "exposure duration",
    "sham exposure"
  ],
  "suggested_hubs": [
    {
      "slug": "mobile-phones",
      "weight": 0.78,
      "reason": "GSM RF-EMF exposure with SAR levels typical of mobile-phone research; EEG outcomes."
    }
  ]
}

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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.22338
PubMed: 33847008

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