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Intelligibility Effects of a Dual-Display SGD using Alphabet Supplementation/Word Prediction

Intelligibility Effects of a Dual-Display SGD using Alphabet Supplementation/Word Prediction. Elizabeth K. Hanson, Ph.D. University of South Dakota, Vermillion, SD David R. Beukelman, Ph.D. University of Nebraska - Lincoln, NE Jana Heidemann, M.A. Edina Public School District, Edina, MN

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Intelligibility Effects of a Dual-Display SGD using Alphabet Supplementation/Word Prediction

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  1. Intelligibility Effects of a Dual-Display SGD using Alphabet Supplementation/Word Prediction Elizabeth K. Hanson, Ph.D. University of South Dakota, Vermillion, SD David R. Beukelman, Ph.D. University of Nebraska - Lincoln, NE Jana Heidemann, M.A. Edina Public School District, Edina, MN Erin Shutts, M.A. King’s Daughters’ Hospital, Madison, IN

  2. Research Problem • Communicators who benefit from AAC often prefer to use their natural speech. • Current speech-generating devices (SGDs) do not accommodate/ facilitate concurrent use of natural speech.

  3. Creating Speech Stimulus MACKIE micro series 1202, 12-channel mixer Speaker/ Unidirectional Condenser Microphone (CM-312) Listener Manipulated parameters of speech signal to degrade intelligibility to <35% DigiTech Vocal300 Voice Processor

  4. Procedures • Speakers instructed to select first letter key of each word in the sentence, as they said each word. • Listeners heardthe word and saw the word-prediction list generated by the first letter. • Listeners instructed to select the word from the word-prediction list. • No-cues (habitual) condition for baseline (i.e., heard words but saw no letter cues or word lists) • Intelligibility % = # words listeners got correct / total # words in 10 sentences * 100.

  5. Mean: 90.7% Results: Sentence Intelligibility Mean: 10.9% Habitual Speech Alpha. Sup.w/Word Pred.

  6. Results Results from one-way within subjects ANOVA indicated a significant intelligibility effect: Wilk’s Lambda = .011, F(1,11)=1011.175, p<.01

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