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Cerebrovascular reactivity during visual stimulation: Does hypnotizability matter?

Anas Rashid1, Enrica Laura Santarcangelo2, Silvestro Roatta1

  • 1Lab of Integrative Physiology, Department of Neuroscience "Rita Levi Montalcini", University of Torino, Torino, Italy.

Brain Research
|August 25, 2022
PubMed
Summary

Higher hypnotizability may be linked to reduced brain metabolic demand during visual stimulation. This study explored posterior cerebral artery flow velocity in individuals with varying hypnotizability levels.

Keywords:
Cerebrovascular reactivityHypnotizabilityPosterior cerebral arteryTranscranial DopplerVisual stimulation

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Area of Science:

  • Neuroscience
  • Psychophysiology

Background:

  • Hypnotizability, a trait influencing conscious states, has known physiological links, including cardiovascular regulation.
  • Understanding the cerebrovascular response to altered states of consciousness is crucial for psychophysiology.

Purpose of the Study:

  • To investigate posterior cerebral artery flow velocity (PCAv) during basal (eyes closed) and visual stimulation (VS) conditions.
  • To compare PCAv and cerebrovascular reactivity (CVR) between medium-high (med-highs) and medium-low (med-lows) hypnotizable individuals.

Main Methods:

  • Utilized the Stanford Hypnotic Susceptibility Scale (form A) to classify 23 healthy volunteers into med-low and med-high hypnotizability groups.
  • Assessed PCAv using transcranial Doppler ultrasound during basal and VS conditions, monitoring blood pressure, heart rate, and end-tidal CO2.
  • Calculated CVR as the percentage change in PCAv during VS relative to basal conditions.

Main Results:

  • Both groups showed a significant increase in PCAv during VS, with no significant difference between groups.
  • A significant negative correlation was observed between CVR and hypnotizability scores specifically within the med-high group.
  • This suggests that higher hypnotizability in med-high individuals may be associated with lower metabolic demand during visual stimulation.

Conclusions:

  • While visual stimulation increases cerebral blood flow in all individuals, the cerebrovascular response regulation differs based on hypnotizability.
  • Higher hypnotizability in susceptible individuals might indicate a more efficient or altered metabolic response to sensory input.