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No Association Between Hypnotizability and Basal Ganglia Morphometry.

Eleonora Picerni¹, Fabrizio Piras¹, Daniela Laricchiuta²

¹IRCCS Santa Lucia Foundation, 00179 Rome, Italy.

|March 27, 2026

Summary

High hypnotizability is not linked to structural differences in the basal ganglia (BG). Previous findings of reduced grey matter volume (GMV) in the insula and cerebellum for highly hypnotizable individuals are not explained by BG morphology.

Keywords:

Stanford Hypnotic Susceptibility Scale Voxel-Based Morphometry basal ganglia hypnotizability individual differences

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Area of Science:

Neuroscience
Psychophysiology

Background:

Hypnotizability is a trait reflecting proneness to hypnotic suggestions and altered states of consciousness.
Previous research identified reduced grey matter volume (GMV) in the insula and cerebellum in highly hypnotizable individuals.
These brain regions may interact with basal ganglia (BG) in hypnotizability-related functions.

Purpose of the Study:

To investigate the morphometric characteristics of the basal ganglia (BG) in relation to hypnotizability.
To determine if structural differences in the BG contribute to hypnotizability-related differences observed in other brain regions.

Main Methods:

Grey Matter Volume (GMV) analysis of the basal ganglia (caudate and pallidum) was performed.
Participants included high (N=12) and low (N=37) hypnotizable individuals from a prior study.
Morphometric characteristics of the BG were compared between high and low hypnotizability groups.

Main Results:

No significant differences in the GMV of the caudate nucleus were found between high and low hypnotizable groups.
No significant differences in the GMV of the pallidum were found between high and low hypnotizable groups.

Conclusions:

Structural differences in the basal ganglia do not account for the observed hypnotizability-related variations in the insula and cerebellum.
The findings suggest that BG morphology is not a significant factor in the neurobiological underpinnings of hypnotizability.