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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Science

Background:

  • The neurobiological basis of auditory hallucination (AH) in schizophrenia is not fully understood.
  • Abnormalities in the speech perception system are implicated in AH, potentially linked to the speech perception neural network model.

Purpose of the Study:

  • To compare speech processing abilities in schizophrenic patients with and without AH.
  • To determine if speech perception improves after AH subsides in schizophrenia patients.

Main Methods:

  • Compared 24 schizophrenic patients with AH to 25 without AH.
  • Assessed narrative speech perception using masked speech tracking (MST) with varying noise levels.
  • Evaluated verbal working memory (SRT) and non-language attention (CPT) before and after treatment.

Main Results:

  • Patients with AH exhibited significant MST impairments pre-treatment compared to those without AH.
  • No significant differences in SRT or CPT-correct rates, but CPT-incorrect rates differed.
  • Post-treatment, schizophrenic patients with prior AH still showed significant MST deficits.

Conclusions:

  • Schizophrenic patients with AH likely have speech perception system disturbances.
  • Non-language attention appears crucial for speech perception ability in this population.
  • Speech perception dysfunction may serve as a trait marker for schizophrenia with AH.