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Related Experiment Videos

The MMN amplitude increases in hypnosis: a case study.

S Kallio1, A Revonsuo, H Lauerma

  • 1Department of Psychology, University of Turku, Centre for Cognitive Neuroscience, University Central Hospital Turku, Finland.

Neuroreport
|January 5, 2000
PubMed
Summary

Hypnosis alters brain information processing at a preattentive level, as shown by a larger mismatch negativity (MMN) in auditory event-related potentials (ERPs). This finding challenges the frontal inhibition theory of hypnosis.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychophysiology

Background:

  • Investigating the neural underpinnings of hypnosis is crucial for understanding altered states of consciousness.
  • The mismatch negativity (MMN) component of auditory event-related potentials (ERPs) reflects preattentive auditory change detection.
  • Previous theories proposed frontal inhibition as a key neural mechanism in hypnosis, potentially measurable via reduced MMN.

Observation:

  • Auditory ERPs, specifically MMN, were recorded in a highly hypnotizable subject during normal baseline and hypnotic states.
  • The passive oddball paradigm used standard and deviant sine tone stimuli (500 Hz and 553 Hz).
  • Measurements were replicated across five separate experimental sessions to ensure reliability.

Findings:

Related Experiment Videos

  • A significantly larger MMN was observed under hypnosis compared to the baseline state.
  • This indicates altered information processing in the brain during hypnosis, even at the preattentive level.
  • The observed increase in MMN contradicts the frontal inhibition theory of hypnosis.

    • Implications:

    • Hypnosis induces measurable changes in early-stage sensory processing within the brain.
    • The findings necessitate a re-evaluation of existing neurophysiological models of hypnosis.
    • This research opens avenues for exploring the neural basis of altered cognitive states and their subjective experiences.