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Exploring neural dynamics in self-voice processing and perception: Implications for hallucination proneness.

Suvarnalata Xanthate Duggirala1, Hanna Honcamp2, Michael Schwartze2

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Summary

Individuals with higher hallucination proneness show altered sensory feedback processing and attention control when generating their own voice. This suggests these changes are fundamental to hallucination proneness across a spectrum.

Keywords:
Attentional controlAuditory verbal hallucinationsEmotionEvent related potentialSelf-voiceSensory feedbackVoice hearing

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Area of Science:

  • Neuroscience
  • Psychology

Background:

  • Auditory verbal hallucinations are linked to altered sensory feedback and attention control.
  • Hallucination proneness (HP) exists on a continuum, but the interplay of these factors across this spectrum is not well understood.

Purpose of the Study:

  • To investigate the interaction between sensory feedback processing and attention control along the hallucination proneness continuum.
  • To examine how these processes are affected during self-voice generation.

Main Methods:

  • Utilized electroencephalography (EEG) with 40 participants exhibiting varying levels of HP.
  • Participants self-generated (button-press) and passively listened to their own voices, which were manipulated for voice quality (neutral to angry morphs).
  • Measured N100 and P200 suppression effects as indicators of sensory processing.

Main Results:

  • A decrease in N100 and P200 suppression effects was observed with increasing HP, irrespective of voice quality.
  • This suggests heightened error awareness and attention allocation in high HP individuals during self-voice production.
  • Findings point to altered sensory feedback processing and/or attentional control as potential mechanisms.

Conclusions:

  • Alterations in sensory feedback processing and/or attentional control during self-voice production are core features of the hallucination proneness continuum.
  • These alterations appear fundamental, regardless of clinical status in individuals who experience voice hearing.