[Effects of 50 Hz electromagnetic field on rat working memory and investigation of neural mechanisms]

{
    "publication_year": 2023,
    "study_type": "animal",
    "exposure": {
        "band": "ELF",
        "source": null,
        "frequency_mhz": 0.05000000000000000277555756156289135105907917022705078125,
        "sar_wkg": null,
        "duration": "0, 24, or 48 days"
    },
    "population": "Rats",
    "sample_size": 15,
    "outcomes": [
        "Working memory performance (T-maze task)",
        "Local field potential (LFP) measures in medial prefrontal cortex (mPFC)",
        "Power spectral density (PSD) of theta (θ) and gamma (γ) oscillations",
        "Phase-amplitude coupling (PAC) intensity of θ-γ oscillations (θ-high-frequency γ)"
    ],
    "main_findings": "In rats exposed to a 50 Hz, 2 mT electromagnetic field for 24 or 48 days, theta and gamma power spectral density decreased and theta–high-frequency gamma phase-amplitude coupling intensity decreased compared with controls. Exposed groups required more days to meet the T-maze task criterion, which the authors interpret as impaired working memory.",
    "effect_direction": "harm",
    "limitations": [
        "Small sample size (15 rats total)",
        "Animal study; generalizability to humans is uncertain",
        "Exposure source/context and other experimental details are not provided in the abstract",
        "Working memory assessment details and quantitative results are not provided in the abstract"
    ],
    "evidence_strength": "low",
    "confidence": 0.7800000000000000266453525910037569701671600341796875,
    "peer_reviewed_likely": "yes",
    "stance": "concern",
    "stance_confidence": 0.8000000000000000444089209850062616169452667236328125,
    "summary": "This animal study exposed rats to a 50 Hz, 2 mT electromagnetic field for 24 or 48 days and assessed working memory using a T-maze task alongside mPFC electrophysiology. The exposed groups showed reduced theta and gamma power and reduced theta–high-frequency gamma phase-amplitude coupling compared with controls. The exposed rats also took more days to meet the task criterion, which the authors interpret as working memory impairment potentially linked to altered oscillatory coupling.",
    "key_points": [
        "Fifteen rats were randomized into control (0 days) and two exposure groups (24 or 48 days) at 50 Hz and 2 mT.",
        "Working memory was evaluated using a T-maze task after exposure.",
        "mPFC local field potentials were recorded during the task to analyze theta and gamma power spectral density.",
        "Both exposure groups showed decreased theta and gamma power compared with controls.",
        "Theta–high-frequency gamma phase-amplitude coupling intensity was reported to decrease significantly versus control.",
        "Exposed groups required more days to reach the task criterion than controls.",
        "Authors suggest impaired oscillatory communication (reduced θ–hγ PAC) as a possible mechanism for working memory effects."
    ],
    "categories": [
        "ELF EMF",
        "Animal Studies",
        "Neuroscience",
        "Cognition & Behavior"
    ],
    "tags": [
        "50 Hz",
        "Extremely Low Frequency",
        "Magnetic Field",
        "2 mT",
        "Rats",
        "Working Memory",
        "T-Maze",
        "Medial Prefrontal Cortex",
        "Local Field Potential",
        "Theta Oscillations",
        "Gamma Oscillations",
        "Phase-Amplitude Coupling",
        "Long-Term Exposure"
    ],
    "keywords": [
        "50 Hz",
        "2 mT",
        "electromagnetic field",
        "working memory",
        "rat",
        "T-maze",
        "medial prefrontal cortex",
        "local field potential",
        "power spectral density",
        "theta",
        "gamma",
        "phase-amplitude coupling"
    ],
    "suggested_hubs": [],
    "social": {
        "tweet": "Rat study: 50 Hz, 2 mT EMF exposure for 24–48 days was associated with poorer T-maze working memory performance and reduced mPFC theta/gamma power and theta–high-gamma phase–amplitude coupling vs controls. (PMID: 38151936)",
        "facebook": "In a rat experiment, long-term exposure to a 50 Hz, 2 mT electromagnetic field (24–48 days) was linked to worse T-maze working memory performance and changes in medial prefrontal cortex oscillations, including reduced theta/gamma power and reduced theta–high-gamma coupling compared with controls.",
        "linkedin": "Animal study (PMID: 38151936): Rats exposed to 50 Hz, 2 mT EMF for 24–48 days showed reduced mPFC theta/gamma power and reduced theta–high-gamma phase–amplitude coupling during a T-maze task, alongside slower attainment of task criterion, suggesting possible working memory impairment under these conditions."
    }
}

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