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Schizophrenia, a term introduced by Swiss psychiatrist Eugen Bleuler in 1911, describes a severe psychological disorder marked by profound disruptions in attention, thought processes, language, emotion, and interpersonal relationships. The core feature of schizophrenia is psychosis — a state characterized by a fundamental detachment from reality. This disconnection manifests through distorted logic, impaired perception, and atypical behavior, severely affecting the lives of those...
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Impaired interaural correlation processing in people with schizophrenia.

Yingjun Zheng1, Lei Liu2, Ruikeng Li1

  • 1The Affiliated Brain Hospital of Guangzhou Medical University, Guangzhou, China.

The European Journal of Neuroscience
|September 8, 2021
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Summary

Schizophrenia impairs auditory processing temporal precision, affecting the detection of sound changes and cognitive functions. This study reveals deficits in break in interaural correlation detection and primitive auditory memory in individuals with schizophrenia.

Keywords:
break in interaural correlationevent-related potentialshigher-order cognitive functionsinter-trial phase coherenceprimitive auditory memory

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Cognitive Neuroscience

Background:

  • Temporal precision in auditory processing is crucial for detecting rapid changes in sound.
  • Interaural correlation detection relies on the brain's temporal processing capabilities.
  • Previous research has not clearly established whether schizophrenia affects temporal precision in interaural correlation processing.

Purpose of the Study:

  • To investigate the impact of schizophrenia on the detection of transient changes in interaural correlation.
  • To assess the temporal extent of primitive auditory memory (PAM) in individuals with schizophrenia.
  • To examine the relationship between early auditory processing, electroencephalogram (EEG) responses, and higher cognitive functions in schizophrenia.

Main Methods:

  • Participants with schizophrenia and healthy controls performed a break in interaural correlation (BIC) detection task.
  • The longest interaural delay for audibility of BIC was measured to determine PAM.
  • Electroencephalograms (EEGs) were recorded during BIC detection, and neuropsychological status was assessed using the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS).

Main Results:

  • Participants with schizophrenia demonstrated significantly poorer BIC detection accuracy and shorter PAM compared to healthy controls.
  • Schizophrenia patients also exhibited lower RBANS scores, indicating impaired higher cognitive functions.
  • Weaker BIC-induced N1-P2 amplitude in schizophrenia was correlated with theta-band power and inter-trial phase coherence.

Conclusions:

  • Schizophrenia impairs the temporal precision of central auditory representations, specifically affecting interaural correlation processing.
  • Deficits in auditory temporal processing are linked to broader impairments in higher-order cognitive functions in schizophrenia.
  • Findings suggest a neural basis for auditory processing and cognitive deficits in schizophrenia.