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An interhemispheric frontoparietal network supports hypnotic states.

Maria Niedernhuber1, Aninka Charlotte Schroeder2, Céline Lercher2

  • 1Department of Psychology, University of Cambridge, Downing Pl, Cambridge, United Kingdom; Department of Psychology, University of Zurich, Binzmuehlestrasse 14, Zurich, Switzerland.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|June 12, 2024
PubMed
Summary
This summary is machine-generated.

Hypnosis alters brain activity by reducing information flow between cortical regions and enhancing theta power. This suggests altered top-down control in frontoparietal networks facilitates hypnotic states.

Keywords:
ConnectivityConsciousnessEEGHypnosisNetworksTheta power

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychology

Background:

  • Understanding the neural basis of altered conscious states, like hypnosis, is crucial for scientific and clinical advancement.
  • Hypnosis significantly impacts conscious perception and cognition, yet its precise effects on cortical information processing remain unclear.

Purpose of the Study:

  • To investigate how manipulating hypnotic state depth affects information processing within cortical networks involved in attention and awareness.
  • To explore the neural correlates distinguishing hypnotic states from control conditions.

Main Methods:

  • Utilized high-density Electroencephalography (EEG) to record resting-state cortical activity in 30 hypnosis experts.
  • Compared brain activity during light and deep hypnotic states against matched control conditions.
  • Applied graph-theoretic measures, including betweenness centrality, to analyze interhemispheric frontoparietal connectivity and information flow.

Main Results:

  • Interhemispheric frontoparietal connectivity differentiated hypnosis from control states, but not light from deep hypnosis.
  • A reduction in information flow through individual brain nodes (betweenness centrality) was observed during hypnosis.
  • Enhanced theta power was detected during hypnotic states.

Conclusions:

  • Findings suggest that altered top-down control in frontoparietal regions, facilitating interhemispheric integration, underlies hypnosis.
  • The study supports a role for enhanced theta power in the generation of hypnotic and other altered conscious states.
  • Reduced information processing efficiency characterizes the hypnotic state compared to wakeful control conditions.