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Verb class distinctions and AAC language-encoding limitations

A E Sutton1, T M Gallagher

  • 1McGill University, Montreal, Canada.

Journal of Speech and Hearing Research
|December 1, 1993
PubMed
Summary
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Individuals using augmentative and alternative communication (AAC) systems showed limited distinction between regular and irregular verbs when marking past tense. Their strategies remained largely unchanged despite a novel affixation method for regular verbs.

Area of Science:

  • Linguistics
  • Psycholinguistics
  • Speech and Language Pathology

Background:

  • Investigating the acquisition of grammatical distinctions in individuals with communication impairments.
  • Examining the use of past tense marking in individuals relying on augmentative and alternative communication (AAC).

Purpose of the Study:

  • To explore how individuals with severe congenital physical impairments, using AAC, encode English past tense distinctions.
  • To analyze the use of regular and irregular verb classes in this population.

Main Methods:

  • Two adults using lexically based AAC systems with eye gaze number codes participated.
  • A novel affixation strategy was introduced for regular verbs, while irregular verb strategies remained semantic.
  • Verb class usage patterns were analyzed.

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Main Results:

  • AAC users employed the same strategy for past tense marking on both regular and irregular verbs initially.
  • Limited evidence of distinctive strategy use based on verb class was observed after introducing the novel affixation method.
  • The semantic strategy for irregular verbs was not altered.

Conclusions:

  • Individuals using AAC may face challenges in distinctively marking grammatical features like past tense across verb classes.
  • Findings suggest implications for AAC system design and language intervention for individuals with severe physical impairments.