Enhanced hypnotic suggestibility following application of burst-firing magnetic fields over the right temporoparietal lobes: a replication.

The International journal of neuroscience · 1996 · Mixed · Low evidence

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MixedLow evidencePaper 4261

After 20 minutes of weak (1 microTesla) burst-firing magnetic field exposure, only the group stimulated over the right temporoparietal lobe showed a marked increase in hypnotic suggestibility (eta = 0.58) compared with other stimulation locations and sham.

Study snapshot

PublicationThe International journal of neuroscience · 1996
Study typeunknown
Reported directionMixed
Evidence ratingLow

Abstract

The suggestibility of normal, young men and women as assessed by Spiegel's Hypnosis Induction Profile (HIP) before and after weak (1 micro Tesla), burst-firing magnetic fields were applied for 20 min over the left or over the right temporoparietal lobe or both hemispheres; a fourth group received sham treatment. Only the group that received the stimulation over the right hemisphere exhibited a marked increase in suggestibility (eta = 0.58) following the treatment. These results replicate components of several different previous experiments and suggest that attribution of symptomatic changes following exposures to weak, extremely low frequency magnetic fields, to placebo effects may not be correct. Instead, fields whose signatures contain biorelevant information may directly affect the neurocognitive processes that are associated with hypnotizability.

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 typeunknown
Effect directionmixed
PopulationNormal, young men and women
Sample sizeNot supplied
ExposureELF · 20 min
Evidence strengthLowConfidence: 66% · Peer reviewed: yes

Main findings

After 20 minutes of weak (1 microTesla) burst-firing magnetic field exposure, only the group stimulated over the right temporoparietal lobe showed a marked increase in hypnotic suggestibility (eta = 0.58) compared with other stimulation locations and sham.

Outcomes measured

  • Hypnotic suggestibility (Spiegel's Hypnosis Induction Profile, HIP)

Limitations

  • Sample size not reported in abstract
  • Frequency characteristics of the burst-firing magnetic fields not specified beyond being described as extremely low frequency
  • Randomization/blinding procedures not described in abstract
  • Outcome limited to hypnotic suggestibility; no clinical endpoints reported
View raw extracted JSON
{
  "study_type": "unknown",
  "exposure": {
    "band": "ELF",
    "source": "other",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "20 min"
  },
  "population": "Normal, young men and women",
  "sample_size": null,
  "outcomes": [
    "Hypnotic suggestibility (Spiegel's Hypnosis Induction Profile, HIP)"
  ],
  "main_findings": "After 20 minutes of weak (1 microTesla) burst-firing magnetic field exposure, only the group stimulated over the right temporoparietal lobe showed a marked increase in hypnotic suggestibility (eta = 0.58) compared with other stimulation locations and sham.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in abstract",
    "Frequency characteristics of the burst-firing magnetic fields not specified beyond being described as extremely low frequency",
    "Randomization/blinding procedures not described in abstract",
    "Outcome limited to hypnotic suggestibility; no clinical endpoints reported"
  ],
  "evidence_strength": "low",
  "confidence": 0.66,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "extremely low frequency",
    "magnetic fields",
    "1 microTesla",
    "burst-firing",
    "temporoparietal lobe",
    "right hemisphere",
    "sham",
    "hypnotic suggestibility",
    "Hypnosis Induction Profile"
  ],
  "suggested_hubs": [
    {
      "slug": "elf-emf",
      "weight": 0.86,
      "reason": "Exposure described as weak, extremely low frequency magnetic fields (1 microTesla)."
    },
    {
      "slug": "brain-neuromodulation",
      "weight": 0.62,
      "reason": "Magnetic fields applied over temporoparietal lobes with neurocognitive outcome (hypnotizability)."
    }
  ]
}
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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: 10.3109/00207459609070838
PubMed: 9003980

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