Publication:

Do phonological neighbourhood density and phonotactic probability influence speech output accuracy in German speakers with acquired apraxia of speech? (2012)

Author(s): Lallini N, Miller N, Howard D

    Abstract: Amongst the many factors that may affect speech production, phonological neighbourhood density (ND) and phonotactic probability (PROB) have displayed effects on speech and language performance in healthy speakers. It is not clear if they show an effect in impaired speech output after stroke and if they do whether this is facilitatory or inhibitory. Therefore, this investigation determined whether ND and/or PROB play a role in speech production accuracy German native speakers with acquired output impairment after stroke. Seven German native speakers with acquired spoken output impairment after stroke repeated 631 single word stimuli. The stimuli included real and nonsense words varying in syllable structure, length and complexity, as well as syllable and word frequency, ND and PROB. Responses were transcribed phonetically and scored as either correct or incorrect. Logistic regression analyses were completed for each speaker separately to determine the effects of ND and PROB on repetition accuracy in relation to controlled variables. One German speaker showed a significant positive effect of PROB on repetition accuracy. None of the individuals showed a significant effect of ND on repetition accuracy. ND does not appear to have a significant independent effect on repetition accuracy in speakers with acquired output impairment after stroke. By contrast PROB has a positive effect on repetition accuracy in impaired speakers, but does not appear to be a major determinant of output accuracy.

      • Journal: Journal of Neurolinguistics
      • Publication type: Article
      • Bibliographic status: In Preparation

        Keywords: apraxia of speech; phonotactic probability; phonological neighbourhood density; German; single-word repetition

        Staff

        Dr Nicole Lallini
        Lecturer in Speech & Lang Pathology