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Self-voice perception and its relationship with hallucination predisposition.

Ana P Pinheiro1, António Farinha-Fernandes1, Magda S Roberto1

  • 1a Faculdade de Psicologia, Universidade de Lisboa , Lisboa , Portugal.

Cognitive Neuropsychiatry
|June 11, 2019
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Summary

Individuals with a higher predisposition to hallucinations show altered self-voice recognition, even without clinical psychosis. This suggests that difficulties processing one's own voice may be part of a broader psychosis continuum.

Keywords:
Hallucination predispositiondiscriminationrecognitionselfvoice

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Area of Science:

  • Neuroscience
  • Psychology
  • Psychiatry

Background:

  • Auditory verbal hallucinations (AVH) are a hallmark of psychotic disorders like schizophrenia, affecting 10-15% of the general population.
  • Impaired self-voice recognition is linked to AVH severity in schizophrenia, especially with negative self-voice qualities.
  • The impact of self-voice processing in nonclinical individuals with varying hallucination predisposition requires further investigation.

Purpose of the Study:

  • To investigate if nonclinical individuals with higher hallucination predisposition exhibit altered self-voice processing.
  • To determine the relationship between hallucination predisposition and voice recognition/discrimination abilities.
  • To examine the influence of hallucination predisposition on the perception of vocal emotional valence.

Main Methods:

  • Thirty-five nonclinical participants completed voice recognition and discrimination tasks involving self and other voices, and vocalizations with varying emotional content.
  • Participants were assessed using the Launay-Slade Hallucination Scale to determine their predisposition to hallucinations.
  • Experiment 1 focused on voice identity processing (recognition and discrimination), while Experiment 2 assessed emotional valence perception.

Main Results:

  • Higher hallucination predisposition significantly impacted voice discrimination and recognition accuracy, independent of emotional stimulus valence.
  • Hallucination predisposition did not influence the ability to evaluate the emotional valence of spoken words and vocalizations.
  • These findings indicate a specific deficit in voice identity processing related to hallucination proneness.

Conclusions:

  • Nonclinical individuals with high hallucination predisposition demonstrate altered self-voice identity processing.
  • Hallucination predisposition does not appear to affect the perception of vocal emotion in nonclinical populations.
  • Altered self-voice perception may represent a transdiagnostic characteristic across the psychosis continuum, present in both clinical and nonclinical voice hearers.