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Verbal processing deficits in schizophrenia.

A A Stevens1, N H Donegan, M Anderson

  • 1Department of Diagnostic Radiology, Yale University School of Medicine, USA. stevenal@ohsu.edu

Journal of Abnormal Psychology
|October 4, 2000
PubMed
Summary
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Schizophrenia patients show specific verbal processing deficits, performing poorly on word tasks but normally on auditory tone tasks. These language-related impairments persist even with nonword stimuli.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychiatry

Background:

  • A subgroup of schizophrenia patients exhibits differential performance on auditory processing tasks.
  • Previous research indicated impairments in word serial position tasks but not tone serial position tasks.

Purpose of the Study:

  • To investigate specific deficits in language-related processing in schizophrenia.
  • To compare performance on verbal and non-verbal (tone) serial position tasks in schizophrenia patients and controls.

Main Methods:

  • Assessed 30 schizophrenia patients and 32 matched controls on verbal and tone serial position tasks.
  • Utilized four versions of verbal tasks and two versions of tone tasks.
  • Investigated the impact of proactive interference and visual presentation on verbal deficits.

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Main Results:

  • Schizophrenia patients performed poorly on all verbal serial position tasks.
  • Patients' performance on tone serial position tasks was comparable to controls.
  • Verbal deficits were exacerbated by proactive interference and visual presentation, persisting with nonword stimuli.

Conclusions:

  • Findings suggest specific deficits in language-related processing in schizophrenia.
  • The observed differential effects between tone and word tasks support a language-specific deficit hypothesis.
  • Further research is needed to rule out task discriminating power as a confounding factor.