Effects of linguistic cues and stimulus cohesion on intelligibility of severely dysarthric speech.

This study examined the effects of supplemental cues on the intelligibility of unrelated sentences and related sentences (narratives) produced by 4 women with severe dysarthria secondary to cerebral palsy. Visual images containing alphabet, topic, combined (alphabet and topic together), and no cues were imposed in real time on audio speech samples and presented to 72 nondisabled listeners. Statistical results showed that cue conditions had similar effects on unrelated and on related sentence intelligibility. Combined cues resulted in higher intelligibility scores than any other cue condition, no cues resulted in lower intelligibility scores than any other cue condition, and alphabet cues yielded higher intelligibility scores than topic cues. Intelligibility of related and unrelated sentences differed only for alphabet cues where related sentences had greater intelligibility than unrelated sentences. Results are discussed relative to the quantity and type of cues.

Functional outcome assessment in dysarthria.

Strategies for the functional assessment of communication disorders experienced by persons with dysarthria can be based on the Chronic Disabilities Model described by Nagi (1991), which considers a disorders at five different levels, ranging from pathophysiology at the level of the tissue to the societal levels of dysfunction. Outcomes can be measured at all levels of the model. For example, at the pathophysiologic level, outcomes may indicate events at the tissue level during the course of the disease, whereas, at the level of the disability, outcomes reveal the adequacy of speech production using compensatory strategies in communicative contexts, and at the societal level, they may indicate the overall degree of success a speaker has in specific real-world speaking situations. This article focuses on "functional" assessment of persons with dysarthria. Thus, assessment is viewed from the perspective of how speech and the use of speech can be measured in functional situations over time or as a result of treatment.

DECTalk and MacinTalk speech synthesizers: intelligibility differences for three listener groups.

This study examined word level intelligibility differences between DECTalk and MacinTalk speech synthesizers using the Modified Rhyme Test in an open format transcription task. Three groups of listeners participated: inexperienced, speech-language pathologists, and speech synthesis experts. Results for between-subjects ANOVA showed that the expert group correctly identified a significantly higher number of words than each of the other listener groups. For the within-subjects factor of voice, simple effects ANOVA and post hoc contrasts within each group showed that listeners had higher intelligibility scores for the DECTalk male voice, Perfect Paul, than for the MacinTalk male voice, Bruce. No other pairwise gender/age-matched differences were found between the two synthesizers.