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Presence hallucination induction through robotically mediated somatomotor conflicts: A pooled analysis of 25

Herberto Dhanis1, Jevita Potheegadoo2, Nathan Faivre3

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Summary

Researchers induced presence hallucinations (PH) using a robotics protocol. Schizotypal traits increased sensitivity, and passivity synergized with PH, advancing psychosis and body perception understanding.

Keywords:
BayesianHallucinationHallucination inductionPolled analysisPresence hallucination

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Robotics

Background:

  • Hallucinations are key symptoms in psychiatric and neurodegenerative disorders.
  • Studying hallucinations in labs is difficult due to limited induction methods.
  • Presence hallucination (PH) is a clinically relevant hallucination.

Purpose of the Study:

  • To systematically investigate the sensitivity and intensity of PH induction.
  • To explore the effects of PH induction on sensory, behavioral, and cognitive aspects.
  • To elucidate the role of somatomotor processes in aberrant own body perceptions.

Main Methods:

  • Pooled individual-participant data from 25 in-house experiments (N=561).
  • Conducted a Bayesian analysis to estimate effects and moderators of PH induction.
  • Utilized a previously developed robotics-based protocol for PH induction.

Main Results:

  • PH induction was reliably achieved with a medium effect size.
  • Individuals with schizotypal traits showed higher sensitivity to PH induction.
  • PH induction showed a synergistic relationship with passivity, not strongly dependent on agency.

Conclusions:

  • Somatomotor processes play a role in aberrant own body perceptions.
  • Findings advance the understanding of psychosis and hallucination.
  • Provides statistical priors for future hallucination research.