Pulsed and continuous wave mobile phone exposure over left versus right hemisphere: effects on human cognitive function.

Bioelectromagnetics · 2007 · No effect · Moderate evidence

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No effectModerate evidencePaper 5079

In 36 healthy male subjects performing cognitive tasks during exposure, no differences were found between continuous wave, pulse-modulated, and sham EMF conditions, nor between left- versus right-sided exposure. An additional control group (n=16) performing t…

Study snapshot

PublicationBioelectromagnetics · 2007

Study typerandomized_trial

Reported directionNo effect

Evidence ratingModerate

Abstract

The possible effects of continuous wave (CW) and pulse modulated (PM) electromagnetic field (EMF) on human cognition was studied in 36 healthy male subjects. They performed cognitive tasks while exposed to CW, PM, and sham EMF. The subjects performed the same tasks twice during each session; once with left-sided and once with right-sided exposure. The EMF conditions were spread across three testing sessions, each session separated by 1 week. The exposed hemisphere, EMF condition, and test order were counterbalanced over all subjects. We employed a double-blind design: both the subject and the experimenter were unaware of the EMF condition. The EMF was created with a signal generator connected via amplifier to a dummy phone antenna, creating a power output distribution similar to the original commercial mobile phone. The EMF had either a continuous power output of 0.25 W (CW) or pulsed power output with a mean of 0.25 W. An additional control group of 16 healthy male volunteers performed the same tasks without any exposure equipment to see if mere presence of the equipment could have affected the subjects' performance. No effects were found between the different EMF conditions, separate hemisphere exposures, or between the control and experimental group. In conclusion, the current results indicate that normal mobile phones have no discernible effect on human cognitive function as measured by behavioral tests.

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 directionno_effect

PopulationHealthy male subjects/volunteers

Sample size52

ExposureRF

Evidence strengthModerateConfidence: 78% · Peer reviewed: yes

Main findings

Outcomes measured

Human cognitive function (behavioral cognitive task performance)

Limitations

Frequency and SAR were not reported in the abstract.
Only healthy male participants were included.
Outcome assessment limited to behavioral cognitive tests; other endpoints not assessed.
Exposure duration per session/task not specified in the abstract.

View raw extracted JSON

{
  "study_type": "randomized_trial",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Healthy male subjects/volunteers",
  "sample_size": 52,
  "outcomes": [
    "Human cognitive function (behavioral cognitive task performance)"
  ],
  "main_findings": "In 36 healthy male subjects performing cognitive tasks during exposure, no differences were found between continuous wave, pulse-modulated, and sham EMF conditions, nor between left- versus right-sided exposure. An additional control group (n=16) performing tasks without exposure equipment also did not differ from the experimental group.",
  "effect_direction": "no_effect",
  "limitations": [
    "Frequency and SAR were not reported in the abstract.",
    "Only healthy male participants were included.",
    "Outcome assessment limited to behavioral cognitive tests; other endpoints not assessed.",
    "Exposure duration per session/task not specified in the abstract."
  ],
  "evidence_strength": "moderate",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "mobile phone",
    "RF EMF",
    "continuous wave",
    "pulse modulated",
    "double-blind",
    "cognition",
    "left hemisphere",
    "right hemisphere",
    "sham exposure"
  ],
  "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: 10.1002/bem.20287
PubMed: 17203481

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