Experimental induction of intermale aggressive behavior in limbic epileptic rats by weak, complex magnetic fields: implications for geomagnetic activity and the modern habitat?

The International journal of neuroscience · 1998 · Mixed · Low evidence

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MixedLow evidencePaper 4073

Study snapshot

PublicationThe International journal of neuroscience · 1998

Study typeanimal

Reported directionMixed

Evidence ratingLow

Abstract

In three separate experiments, groups (4/group) of male rats with limbic epilepsy were exposed for 80 min every 24 hr during the midscotophase for 24 successive days to sham-field conditions or to one of four complex patterns of magnetic fields whose average intensities ranged between 20 nT to 500 nT. The numbers of episodes of boxing, biting, mounting, eating, drinking and grooming were then recorded each night during the latter 20 min. Moderately strong statistically significant interactions occurred between the presence or absence of the field and the pattern of the field explained 25% and 50% of the variance in the numbers of biting and boxing responses, respectively. Other behaviors were not affected. The results suggest that group aggression can be increased or decreased as a function of the temporal characteristics and morphology (shape) of the applied magnetic field.

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 typeanimal

Effect directionmixed

PopulationMale rats with limbic epilepsy

Sample sizeNot supplied

ExposureELF · 80 min every 24 hr during the midscotophase for 24 successive days

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Across three experiments (groups of 4), exposure to weak complex magnetic field patterns (average intensities 20 nT to 500 nT) showed statistically significant interactions between field presence/absence and field pattern for biting and boxing, explaining 25% and 50% of variance, respectively. Other recorded behaviors (mounting, eating, drinking, grooming) were not affected. Aggression could be increased or decreased depending on temporal characteristics/morphology of the applied field.

Outcomes measured

Aggressive behavior (biting, boxing)
Mounting
Eating
Drinking
Grooming

Limitations

Sample size per group was small (4/group)
Frequency characteristics of the complex magnetic field patterns were not specified in the abstract
Animal model (rats with limbic epilepsy) may limit generalizability to healthy animals or humans

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "ELF",
    "source": "other",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "80 min every 24 hr during the midscotophase for 24 successive days"
  },
  "population": "Male rats with limbic epilepsy",
  "sample_size": null,
  "outcomes": [
    "Aggressive behavior (biting, boxing)",
    "Mounting",
    "Eating",
    "Drinking",
    "Grooming"
  ],
  "main_findings": "Across three experiments (groups of 4), exposure to weak complex magnetic field patterns (average intensities 20 nT to 500 nT) showed statistically significant interactions between field presence/absence and field pattern for biting and boxing, explaining 25% and 50% of variance, respectively. Other recorded behaviors (mounting, eating, drinking, grooming) were not affected. Aggression could be increased or decreased depending on temporal characteristics/morphology of the applied field.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size per group was small (4/group)",
    "Frequency characteristics of the complex magnetic field patterns were not specified in the abstract",
    "Animal model (rats with limbic epilepsy) may limit generalizability to healthy animals or humans"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "rats",
    "limbic epilepsy",
    "complex magnetic fields",
    "nanotesla",
    "aggression",
    "biting",
    "boxing",
    "behavior",
    "geomagnetic activity"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.2,
      "reason": "Magnetic-field exposure experiment; not clearly occupational but relates to environmental magnetic fields."
    }
  ]
}

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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: 10.3109/00207459808986464
PubMed: 10069616

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