Frequency-specific blocking in the human brain caused by electromagnetic fields.

Neuroreport · 1994 · Mixed · Very low evidence

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MixedVery low evidencePaper 5456

Ten subjects exposed to a 10 Hz, 1 gauss electromagnetic field for 10 minutes showed significantly reduced 10 Hz brain electrical activity at occipital electrodes during the 1-minute interval after exposure compared with control values from the same subjects.

Study snapshot

PublicationNeuroreport · 1994

Study typeunknown

Reported directionMixed

Evidence ratingVery low

Abstract

Based on preliminary observations that continuous exposure to electromagnetic fields (EMFs) produced an after-effect on human brain electrical activity, the effect of 10 Hz, 1 gauss, on the intrinsic activity of the brain at that frequency was studied. Ten subjects were exposed for 10 min and the 10 Hz spectral power was measured during the 1 min interval following stimulation and compared with control values obtained from the same subjects. Significantly reduced brain electrical activity from the occipital electrodes following termination of the EMF exposure was observed, thereby confirming the preliminary results.

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 typeunknown

Effect directionmixed

PopulationHuman subjects

Sample size10

ExposureELF · 10 min

Evidence strengthVery lowConfidence: 66% · Peer reviewed: yes

Main findings

Outcomes measured

Brain electrical activity (EEG)
10 Hz spectral power
Occipital electrode activity

Limitations

Small sample size (n=10)
Only short-term after-effect assessed (1 minute post-exposure)
Exposure source and other exposure parameters not described in the abstract

View raw extracted JSON

{
  "study_type": "unknown",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "10 min"
  },
  "population": "Human subjects",
  "sample_size": 10,
  "outcomes": [
    "Brain electrical activity (EEG)",
    "10 Hz spectral power",
    "Occipital electrode activity"
  ],
  "main_findings": "Ten subjects exposed to a 10 Hz, 1 gauss electromagnetic field for 10 minutes showed significantly reduced 10 Hz brain electrical activity at occipital electrodes during the 1-minute interval after exposure compared with control values from the same subjects.",
  "effect_direction": "mixed",
  "limitations": [
    "Small sample size (n=10)",
    "Only short-term after-effect assessed (1 minute post-exposure)",
    "Exposure source and other exposure parameters not described in the abstract"
  ],
  "evidence_strength": "very_low",
  "confidence": 0.66,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "electromagnetic fields",
    "ELF",
    "10 Hz",
    "1 gauss",
    "EEG",
    "spectral power",
    "occipital electrodes",
    "after-effect"
  ],
  "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: 10.1097/00001756-199401120-00036
PubMed: 8003686

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