RF Safe

Time-course of electromagnetic field effects on human performance and tympanic temperature.

Neuroreport · 2004 · Mixed · Low evidence

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MixedLow evidencePaper 5230

Under active 902.40 MHz exposure, simple- and choice-reaction times improved and local (tympanic) temperature increased on the exposed region. Reaction time and temperature changes showed a time-course, with appreciable changes requiring at least 25 minutes o…

Study snapshot

PublicationNeuroreport · 2004
Study typerandomized_trial
Reported directionMixed
Evidence ratingLow

Abstract

The study aimed to investigate the time-course of electromagnetic field (EMF)-induced effects on human cognitive and behavioral performance and on tympanic temperature. Subjects were randomly assigned to two groups, exposed to a 902.40 MHz EMF before the testing session, or to the same signal during the data collecting session. Following a double-blind paradigm, subjects were tested on four performance tasks: an acoustic simple-reaction time task, a visual search task, an arithmetic descending subtraction task and an acoustic choice-reaction time task. Moreover, tympanic temperature was collected five times during each session. Results indicated an improvement of both simple- and choice-reaction times and an increase of local temperature on the exposed region under the active exposure. There was a clear time-course of the reaction time and temperature data, indicating that performance and physiological measures need a minimum of 25 min of EMF exposure to show appreciable changes.

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 typerandomized_trial
Effect directionmixed
PopulationHuman subjects
Sample sizeNot supplied
ExposureRF · 902.4 MHz · minimum of 25 min exposure needed to show appreciable changes (time-course assessed)
Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Under active 902.40 MHz exposure, simple- and choice-reaction times improved and local (tympanic) temperature increased on the exposed region. Reaction time and temperature changes showed a time-course, with appreciable changes requiring at least 25 minutes of exposure.

Outcomes measured

  • Cognitive and behavioral performance (reaction time, visual search, arithmetic subtraction)
  • Tympanic temperature (local temperature on exposed region)

Limitations

  • Sample size not reported in provided abstract/metadata
  • Exposure source and dosimetry (e.g., SAR) not reported in provided abstract/metadata
  • Details of randomization, participant characteristics, and statistical estimates not reported in provided abstract/metadata
View raw extracted JSON
{
  "study_type": "randomized_trial",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": 902.4,
    "sar_wkg": null,
    "duration": "minimum of 25 min exposure needed to show appreciable changes (time-course assessed)"
  },
  "population": "Human subjects",
  "sample_size": null,
  "outcomes": [
    "Cognitive and behavioral performance (reaction time, visual search, arithmetic subtraction)",
    "Tympanic temperature (local temperature on exposed region)"
  ],
  "main_findings": "Under active 902.40 MHz exposure, simple- and choice-reaction times improved and local (tympanic) temperature increased on the exposed region. Reaction time and temperature changes showed a time-course, with appreciable changes requiring at least 25 minutes of exposure.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in provided abstract/metadata",
    "Exposure source and dosimetry (e.g., SAR) not reported in provided abstract/metadata",
    "Details of randomization, participant characteristics, and statistical estimates not reported in provided abstract/metadata"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "RF EMF",
    "902.40 MHz",
    "double-blind",
    "randomized",
    "reaction time",
    "cognitive performance",
    "tympanic temperature",
    "time-course"
  ],
  "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: 10.1097/00001756-200401190-00031
PubMed: 15106850

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