Impact of Microwave Exposure on Cynomolgus Monkeys: EEG and ECG Analysis

{
    "publication_year": 2025,
    "study_type": "animal",
    "exposure": {
        "band": "microwave",
        "source": null,
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": "15 min"
    },
    "population": "Cynomolgus monkeys (Macaca fascicularis)",
    "sample_size": 3,
    "outcomes": [
        "EEG power spectral densities (whole brain and regional; δ, θ, α, β, low-γ, high-γ bands)",
        "ECG T-wave shape and amplitude changes"
    ],
    "main_findings": "In three cynomolgus monkeys exposed to 50 mW/cm2 microwave radiation for 15 minutes, EEG power spectral densities showed no significant differences in whole brain, frontal, and temporal regions immediately and up to 30 days post-exposure. Alterations were mainly reported at 14 days in several regions (parietal lobe, prefrontal cortex, central zone, occipital lobe), particularly in θ and α bands, with values returning to normal ranges by day 30. ECG changes in T-wave shape/amplitude were observed, with some changes normalizing by day 30 while one monkey had a T-wave pattern persisting at day 30.",
    "effect_direction": "mixed",
    "limitations": [
        "Very small sample size (n=3)",
        "Frequency (L-band) not quantified in the abstract",
        "No sham/control group described in the abstract",
        "Statistical methods and significance thresholds not described in the abstract",
        "Exposure metric reported as power density (50 mW/cm2) without SAR information"
    ],
    "evidence_strength": "low",
    "confidence": 0.7800000000000000266453525910037569701671600341796875,
    "peer_reviewed_likely": "yes",
    "stance": "neutral",
    "stance_confidence": 0.66000000000000003108624468950438313186168670654296875,
    "summary": "This animal study monitored EEG and ECG in three cynomolgus monkeys before and after a 15-minute exposure to 50 mW/cm2 L-band microwave radiation. The abstract reports no immediate EEG/ECG alterations, but describes region-specific EEG changes mainly at 14 days (notably in θ and α bands) that returned to normal ranges by day 30. ECG T-wave changes were observed, with normalization in some cases and persistence in one monkey at day 30.",
    "key_points": [
        "Three cynomolgus monkeys were assessed with EEG and ECG before and at multiple time points up to 30 days after microwave exposure.",
        "Exposure was 50 mW/cm2 microwave radiation for 15 minutes (L-band).",
        "Whole-brain, frontal, and temporal EEG power spectral densities reportedly showed no significant differences across bands immediately through 30 days.",
        "EEG alterations were mainly noted at 14 days in parietal, prefrontal, central, and occipital regions, especially in θ and α bands.",
        "EEG values were reported to return to normal ranges by day 30.",
        "ECG changes involved T-wave shape and amplitude, with variable patterns across the three monkeys.",
        "One monkey showed a T-wave pattern at 14 days that persisted at 30 days, while other changes normalized by day 30."
    ],
    "categories": [
        "Animal Studies",
        "Microwave/RF Exposure",
        "Neurophysiology (EEG)",
        "Cardiac Physiology (ECG)"
    ],
    "tags": [
        "Cynomolgus Monkeys",
        "Microwave Radiation",
        "L-Band",
        "Power Spectral Density",
        "Electroencephalography",
        "Electrocardiography",
        "T-Wave Changes",
        "Theta Band",
        "Alpha Band",
        "Short-Term Exposure",
        "Follow-Up Study"
    ],
    "keywords": [
        "microwave exposure",
        "cynomolgus monkeys",
        "EEG",
        "ECG",
        "power spectral density",
        "L-band",
        "T-wave"
    ],
    "suggested_hubs": [],
    "social": {
        "tweet": "Animal study (n=3) exposed cynomolgus monkeys to 50 mW/cm2 L-band microwaves for 15 min: no immediate EEG/ECG changes reported, but region-specific EEG changes at day 14 (θ/α) and variable ECG T-wave changes; most EEG changes normalized by day 30.",
        "facebook": "In a small animal study, three cynomolgus monkeys were monitored with EEG and ECG before and after a 15-minute exposure to 50 mW/cm2 L-band microwave radiation. The abstract reports no immediate changes, but notes region-specific EEG differences mainly at 14 days (especially in theta and alpha bands) that returned to normal ranges by day 30, along with variable ECG T-wave changes.",
        "linkedin": "Bioelectromagnetics (2025) reports an animal study (n=3 cynomolgus monkeys) assessing EEG/ECG before and up to 30 days after a 15-minute exposure to 50 mW/cm2 L-band microwave radiation. The abstract describes no immediate effects, transient region-specific EEG changes around day 14 (θ/α bands) with normalization by day 30, and variable ECG T-wave alterations."
    }
}

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