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Schizophrenia is a complex psychiatric disorder characterized by a range of symptoms that significantly impact cognition, behavior, and emotional regulation. Among these, the positive symptoms stand out as they involve the addition or exaggeration of normal mental functions, deviating markedly from typical behavior and perception. Hallucinations and delusions are prominent positive symptoms, each profoundly affecting the individual's experience of reality.
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P50 Sensory Gating in Infants
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Diminished auditory sensory gating during active auditory verbal hallucinations.

Robert J Thoma1, Andrew Meier2, Jon Houck3

  • 1Department of Psychiatry, 1 University of New Mexico, MSC 09 5030, Albuquerque, NM 87131, USA; The Mind Research Network and the Lovelace Family of Companies, 1101 Yale NE, Albuquerque, NM 87131, USA; Department of Psychology, University of New Mexico, Albuquerque, NM 87131, USA.

Schizophrenia Research
|January 23, 2017
PubMed
Summary

Auditory sensory gating, a measure of stimulus filtering, is impaired during auditory verbal hallucinations (AVH). This study links impaired gating to AVH onset, suggesting a sensory control failure in schizophrenia.

Keywords:
Auditory processingAuditory sensory gatingAuditory verbal hallucinationsEEGERPHallucinationsSchizophrenia

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Science

Background:

  • Auditory sensory gating reflects the brain's ability to filter incoming auditory stimuli.
  • Dysfunctional sensory gating, indicated by higher gating ratios, is linked to sensory processing deficits in schizophrenia.
  • Auditory verbal hallucinations (AVH) in schizophrenia may stem from a failure in early sensory control processes.

Purpose of the Study:

  • To investigate auditory sensory gating during active auditory verbal hallucinations (AVH-on) versus periods without hallucinations (AVH-off) in patients with treatment-resistant schizophrenia.
  • To examine the relationship between AVH severity and auditory sensory gating.
  • To explore the role of sensory gating in the pathophysiology of AVH.

Main Methods:

  • Electroencephalography (EEG) was used to record brain activity in 12 patients with treatment-resistant AVH during a paired-click paradigm.
  • Auditory sensory gating ratios were calculated for P50, N100, and P200 components during both AVH-on and AVH-off states.
  • Hallucination severity was assessed using the Psychotic Symptoms Rating Scales (PSYRATS) AVH Total score.

Main Results:

  • Gating ratios were significantly higher during the AVH-on state compared to the AVH-off state across all measured components (P50, N100, P200).
  • A significant negative correlation was found between the N100 gating ratio and AVH severity (PSYRATS score) specifically during the AVH-off state.
  • These findings indicate a state-dependent impairment of auditory sensory gating associated with active hallucinations.

Conclusions:

  • The results demonstrate a failure in auditory sensory gating during active AVH, supporting the hypothesis that impaired sensory inhibition contributes to hallucination generation.
  • This study provides empirical evidence linking the onset of AVH to a breakdown in the brain's auditory filtering mechanisms.
  • These findings support the development of a sensory gating model for understanding and potentially treating auditory verbal hallucinations in schizophrenia.