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

PAPER pubmed Neuroreport 1994 Unknown Effect: mixed Evidence: Very low

Read original paper → DOI: 10.1097/00001756-199401120-00036 PMID: 8003686 Evidence Lab

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.

AI evidence extraction

At a glance

Study type

Unknown

Effect direction

mixed

Population

Human subjects

Sample size

Exposure

ELF · 10 min

Evidence strength

Very low

Confidence: 66% · Peer-reviewed: yes

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.

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": 0.66000000000000003108624468950438313186168670654296875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "electromagnetic fields",
        "ELF",
        "10 Hz",
        "1 gauss",
        "EEG",
        "spectral power",
        "occipital electrodes",
        "after-effect"
    ],
    "suggested_hubs": []
}

AI can be wrong. Always verify against the paper.

AI-extracted fields are generated from the abstract/metadata and may be incomplete or incorrect. This content is for informational purposes only and is not medical advice.

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