Impact of expectancy on fatigue by exposure to the fifth generation of mobile communication signals

{
  "publication_year": 2025,
  "study_type": "randomized_trial",
  "exposure": {
    "band": "RF",
    "source": "5G mobile communication signals",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "Two 30-min exposures per session; three sessions"
  },
  "population": "21 healthy subjects",
  "sample_size": 21,
  "outcomes": [
    "Fatigue (questionnaire)",
    "EEG power"
  ],
  "main_findings": "In statistical comparisons, routine-level 5G RF-EMF exposure did not lead to changes in EEG power. Reported fatigue was influenced by the information given to participants about exposure order (correct/false/no information), including when there was no actual exposure and no detectable electrophysiological indicator.",
  "effect_direction": "mixed",
  "limitations": [
    "Small sample size (21 subjects)",
    "Fatigue outcome relies on self-report questionnaire",
    "Exposure parameters (e.g., frequency, SAR) not specified in the provided abstract",
    "Short exposure duration (30 minutes per exposure)"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "stance": "neutral",
  "stance_confidence": 0.74,
  "summary": "This randomized sham-controlled study in 21 healthy participants tested whether routine-level 5G RF-EMF exposure affects fatigue and EEG power, while manipulating expectancy via correct, false, or no information about exposure order. The study reports no change in EEG power with real versus sham exposure. However, self-reported fatigue varied with the conveyed information about being exposed, suggesting an expectancy/psychological priming effect on symptom reporting.",
  "key_points": [
    "Participants completed three sessions with randomized real and sham 5G exposures.",
    "Each session included two 30-minute exposure periods.",
    "Expectancy was manipulated by providing correct, false, or no information about exposure order.",
    "Routine-level 5G exposure was reported not to change EEG power.",
    "Self-reported fatigue was influenced by the information given about exposure, even without actual exposure.",
    "Authors conclude psychological priming should be prevented or accounted for in RF-EMF fatigue research."
  ],
  "categories": [
    "RF-EMF",
    "5G",
    "Epidemiology",
    "Symptoms",
    "Neurophysiology"
  ],
  "tags": [
    "5G Signals",
    "RF-EMF Exposure",
    "Fatigue",
    "Expectancy Effects",
    "Psychological Priming",
    "Sham Exposure",
    "Randomized Order",
    "EEG Power",
    "Nocebo Effect",
    "Symptom Reporting"
  ],
  "keywords": [
    "RF-EMF",
    "5G signals",
    "fatigue",
    "expectancy",
    "psychological priming",
    "EEG",
    "mobile communication health effects"
  ],
  "suggested_hubs": [
    {
      "slug": "5g-policy",
      "weight": 0.62,
      "reason": "Study directly examines effects and expectancy related to 5G signal exposure."
    }
  ],
  "social": {
    "tweet": "Randomized sham-controlled study (n=21) found routine-level 5G RF-EMF did not change EEG power, but reported fatigue shifted with the information participants received about being exposed—highlighting expectancy/priming effects.",
    "facebook": "In a small randomized sham-controlled experiment, routine-level 5G RF-EMF exposure was not associated with changes in EEG power. Reported fatigue, however, was influenced by what participants were told about exposure, suggesting expectancy can shape symptom reports.",
    "linkedin": "A randomized sham-controlled study in 21 healthy participants reports no EEG power changes with routine-level 5G RF-EMF exposure, while self-reported fatigue was modulated by conveyed information about exposure order—underscoring the role of expectancy/psychological priming in symptom reporting."
  }
}