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Dissecting corollary discharge dysfunction in schizophrenia.

Judith M Ford1, Max Gray, William O Faustman

  • 1Psychiatry Service, Veterans Affairs Connecticut Healthcare System, West Haven 06517, and Department of Psychiatry, Yale University School of Medicne, New Haven, Connecticut, USA. Judith.ford@yale.edu

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Summary
This summary is machine-generated.

Schizophrenia patients show impaired auditory N1 suppression during talking, indicating a deficit in corollary discharge. This failure in self-monitoring is specific to talking and not explained by agency or expectancy deficits alone.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Auditory Perception

Background:

  • A corollary discharge mechanism prepares the brain for self-generated sounds, reducing sensory responsiveness.
  • This process is crucial for distinguishing self-produced sounds from external ones and is linked to a sense of agency.
  • Reduced auditory N1 suppression during speech is observed in schizophrenia, suggesting a potential deficit in this predictive coding mechanism.

Purpose of the Study:

  • To investigate the corollary discharge mechanism during speech in individuals with schizophrenia.
  • To examine the role of agency and expectancy in auditory N1 suppression in schizophrenia patients compared to controls.

Main Methods:

  • Auditory Event-Related Potential (ERP) N1 component was measured in 27 patients (23 schizophrenia, 4 schizoaffective) and 26 healthy controls.
  • Participants engaged in three conditions: spontaneous talking, cued agency (button press to produce sound), and cued expectancy (sound preceded by a warning).

Main Results:

  • Controls exhibited significant N1 suppression during talking, while schizophrenia patients showed a failure of this suppression.
  • Both agency and expectancy conditions produced modest N1 suppression, primarily in controls.
  • Group differences in agency and expectancy did not fully explain the impaired N1 suppression during talking in schizophrenia patients.

Conclusions:

  • The findings suggest a specific deficit in the corollary discharge mechanism during speech production in schizophrenia.
  • This impairment in self-monitoring may contribute to altered auditory perception and agency deficits in schizophrenia.
  • The results highlight the importance of speech-specific predictive coding in understanding schizophrenia pathophysiology.