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Language abnormality in deaf people with schizophrenia: a problem with classifiers.

G Chatzidamianos1, R A McCarthy2, M Du Feu3

  • 1a Department of Psychology, Faculty of Health, Psychology & Social Care , Manchester Metropolitan University , Manchester , UK.

Cognitive Neuropsychiatry
|June 6, 2018
PubMed
Summary

Schizophrenia uniquely impacts language production in deaf individuals, affecting their use of sign language classifiers. Patients with schizophrenia showed significant deficits in producing and comprehending both nouns and entity classifiers.

Keywords:
Deafnessclassifiershandshapeschizophreniasign language

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Area of Science:

  • Linguistics
  • Psychiatry
  • Neuroscience

Background:

  • Schizophrenia is associated with language abnormalities.
  • Sign languages utilize classifiers, a unique linguistic feature for reference tracking.
  • Limited research exists on sign language in deaf individuals with schizophrenia.

Purpose of the Study:

  • To investigate classifier production and comprehension in deaf adults with schizophrenia.
  • To compare performance between deaf patients with schizophrenia and healthy deaf controls.
  • To identify specific linguistic deficits related to schizophrenia in sign language.

Main Methods:

  • A cohort of 14 profoundly deaf signing adults with schizophrenia was recruited.
  • 35 age- and IQ-matched deaf healthy controls participated.
  • A test battery assessed comprehension and production of nouns and entity classifiers.

Main Results:

  • Patients with schizophrenia performed significantly worse than controls on both noun and classifier tasks.
  • Deficits were most pronounced in the production of entity classifiers.
  • Errors in classifier production primarily involved handshape, not movement or location.

Conclusions:

  • Schizophrenia affects sign language production in deaf patients uniquely.
  • The findings highlight distinct language processing alterations in deaf individuals with schizophrenia compared to hearing individuals.
  • Classifier production deficits may represent a specific linguistic marker of schizophrenia in this population.