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Published on: August 9, 2024
Exploring neural dynamics in self-voice processing and perception: Implications for hallucination proneness
Suvarnalata Xanthate Duggirala1, Hanna Honcamp2, Michael Schwartze2
1Department of Neuropsychology and Psychopharmacology, Faculty of Psychology and Neuroscience, Maastricht University, Maastricht, the Netherlands; Faculty of Psychology, University of Lisbon, Lisbon, Portugal; Department of Psychiatry and Neuropsychology, School of Mental Health and Neuroscience, Faculty of Health and Medical Sciences, Maastricht University, Maastricht, the Netherlands.
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.
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.
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