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Numerical skills and aphasia.

M Delazer1, L Girelli, C Semenza

  • 1Universitätsklinik, Innsbruck, Austria. margarete.delazer@uibk.ac.at

Journal of the International Neuropsychological Society : JINS
|April 28, 1999
PubMed
Summary

Patients with left hemispheric lesions and aphasia exhibit numerical deficits. The severity of language impairment directly correlates with calculation errors, with specific deficits linked to aphasia type.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Linguistics

Background:

  • Left hemispheric lesions can lead to aphasia, a language disorder.
  • Aphasia is associated with cognitive impairments, including numerical processing.
  • Understanding these deficits is crucial for rehabilitation strategies.

Purpose of the Study:

  • To investigate numerical difficulties in patients with left hemispheric lesions and aphasia.
  • To correlate the severity of language deficits with the extent of numerical impairment.
  • To analyze specific calculation errors based on aphasia type.

Main Methods:

  • Study included 50 patients with left hemispheric lesions.
  • Patients were classified by aphasia type using the Aachener Aphasia Test.

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  • Performance was assessed on transcoding and calculation tasks.

    • Main Results:

    • Overall error rates in numerical tasks correlated with language deficit severity.
    • Global aphasics showed the most significant impairment, followed by Broca's and Wernicke's aphasics; amnesic aphasics were least impaired.
    • Multiplication was the most affected operation, especially in Broca's aphasia, suggesting verbal processing for multiplication facts.

    Conclusions:

    • Numerical deficits in aphasia are directly linked to language impairment severity.
    • Specific error patterns in calculation tasks reflect the underlying language deficits.
    • Verbal processing plays a significant role in retrieving multiplication facts.