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After-effect induced by microwave radiation in human electroencephalographic signal: a feasibility study.

International journal of radiation biology · 2018 · Mixed · Very low evidence

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MixedVery low evidencePaper 6624

In EEG signals time-locked to the microwave radiation (MWR)-OFF stimulus, an enhanced signal level in the alpha band and about twice higher signal-to-noise ratio at 200–440 ms after the stimulus were detected. No remarkable response was observed in EEG signal…

Study snapshot

PublicationInternational journal of radiation biology · 2018
Study typeother
Reported directionMixed
Evidence ratingVery low

Abstract

PURPOSE: This feasibility study is aimed to clarify the possibility of detection of microwave radiation (MWR)-induced event related potential (ERP) in electroencephalographic (EEG) signal. METHODS: To trigger onset and offset effects in EEG, repetitive MWR stimuli were used. Four 30-channel EEG recordings on a single subject were performed, each about one month apart. The subject was exposed to 450 MHz MWR modulated at 40 Hz at the 1 g peak spatial average specific absorption rate of 0.3 W/kg. During a recording, 40 cycles of 30 s on-off MWR exposure were used. The artifact-free responses to 126 MWR-ON stimuli and 134 MWR-OFF stimuli were averaged over stimuli and channels. RESULTS: Regarding EEG signals locked to MWR-OFF stimulus, the enhanced signal level at alpha frequency band and about twice higher signal to noise ratio at 200 to 440 ms after the stimulus have been detected. No remarkable response in EEG signals locked to MWR-ON stimulus. CONCLUSIONS: The detection of offset effect confirms that there should be an imprint generated by MWR in brain. The results of this preliminary study provide evidence for the detection of MWR-induced ERP in EEG signal and encourage further research in this direction.

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 typeother
Effect directionmixed
PopulationSingle human subject
Sample size1
ExposureRF · 450 MHz · 0.3 W/kg · 40 cycles of 30 s on-off exposure during a recording; four recordings about one month apart
Evidence strengthVery lowConfidence: 74% · Peer reviewed: yes

Main findings

In EEG signals time-locked to the microwave radiation (MWR)-OFF stimulus, an enhanced signal level in the alpha band and about twice higher signal-to-noise ratio at 200–440 ms after the stimulus were detected. No remarkable response was observed in EEG signals time-locked to the MWR-ON stimulus.

Outcomes measured

  • Electroencephalographic (EEG) signal
  • Event-related potential (ERP) in EEG
  • Alpha frequency band signal level
  • Signal-to-noise ratio (SNR) 200–440 ms post-stimulus

Limitations

  • Single-subject feasibility study
  • Only four EEG recordings (about one month apart)
  • Preliminary design; results described as encouraging further research
View raw extracted JSON
{
  "study_type": "other",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": 450,
    "sar_wkg": 0.3,
    "duration": "40 cycles of 30 s on-off exposure during a recording; four recordings about one month apart"
  },
  "population": "Single human subject",
  "sample_size": 1,
  "outcomes": [
    "Electroencephalographic (EEG) signal",
    "Event-related potential (ERP) in EEG",
    "Alpha frequency band signal level",
    "Signal-to-noise ratio (SNR) 200–440 ms post-stimulus"
  ],
  "main_findings": "In EEG signals time-locked to the microwave radiation (MWR)-OFF stimulus, an enhanced signal level in the alpha band and about twice higher signal-to-noise ratio at 200–440 ms after the stimulus were detected. No remarkable response was observed in EEG signals time-locked to the MWR-ON stimulus.",
  "effect_direction": "mixed",
  "limitations": [
    "Single-subject feasibility study",
    "Only four EEG recordings (about one month apart)",
    "Preliminary design; results described as encouraging further research"
  ],
  "evidence_strength": "very_low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave radiation",
    "RF exposure",
    "450 MHz",
    "EEG",
    "event-related potential",
    "ERP",
    "alpha band",
    "signal-to-noise ratio",
    "offset effect",
    "onset effect",
    "SAR 0.3 W/kg",
    "40 Hz modulation"
  ],
  "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: 10.1080/09553002.2018.1478164
PubMed: 29775395

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