Segmental and prosodic variability on repeated polysyllabic word production in acquired apraxia of speech plus aphasia

Scholl, Dominique I.; McCabe, Patricia; Heard, Rob; Ballard, Kirrie J.

doi:10.1080/02687038.2017.1381876

Cited by 14 publications

(5 citation statements)

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“…For example, the pairwise variability index (PVI) of vowel duration, which represents a normalized ratio of vowel durations in adjacent syllables and has been used to quantify lexical stress (Scholl et al . , Vergis et al . , Ballard et al .…”

Section: Introductionmentioning

confidence: 99%

Reliability and stability of the metrical stress effect on segmental production accuracy in persons with apraxia of speech

Bailey

Bunker

Mauszycki

et al. 2019

Intl J Lang & Comm Disor

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Background: Acquired apraxia of speech (AOS) involves speech-production deficits on both the segmental and suprasegmental levels. Recent research has identified a non-linear interaction between the metrical structure of bisyllabic words and word-production accuracy in German speakers with AOS, with trochaic words (strong-weak stress) being resistant to errors compared with iambic words (weak-strong). Aims: To replicate previous findings in English speakers with AOS, to measure the test-retest reliability of the effect, and to examine the potential impact of different methods of word scoring. Methods & Procedures: Speech samples were collected from 27 speakers with AOS and aphasia. Participants were at least 12 months post-stroke or penetrating brain injury, and represented a large range of AOS and aphasia severities. Productions were elicited via verbal model. Sampling was conducted on three separate occasions: the initial data-collection session and then repeated samplings at 1-and 4-week intervals. Bisyllabic words with a CVCVC segmental structure were selected. The list was divided into sublists representing differing lexical stress patterns: A list of 42 trochees, and one of 37 iambs. All speech samples were phonetically transcribed and then aligned with canonical transcriptions via an edit distance algorithm that followed transcription alignment principles. Phonetic-level errors (distortions) were penalized less severely than phonemic-level errors. Per cent consonants correct and whole-word accuracy were also examined. Trochee and iamb lists were analysed separately. Outcomes & Results: Paired samples t-tests indicated that the modified edit distance was significantly lower for the trochee lists than for the iamb lists. There was a lack of a significant effect of time on the absolute difference between modified edit distance for both lists. Intraclass coefficients suggested the list and procedures used are appropriate as an outcome measure for group research. Conclusions & Implications:The results suggest that in English, as in German, the trochaic structure is more resistant to segmental errors in persons with AOS and aphasia, providing replication of the findings of Aichert et al. in 2016. Further, this effect is stable over repeated sampling occasions. Implications for clinical management of AOS include possible ways to scaffold item difficulty and potentially improve stimulus generalization. What this paper addsWhat is already known on the subject Research has previously shown a metrical stress effect on segmental production accuracy in German speakers with AOS. Such non-linear influences on segmental production accuracy provide insight into the speech-production process.What this paper adds to existing knowledge This paper shows a metrical stress effect in bisyllabic word repetition of English speakers with AOS, replicating previous work done with German speakers with AOS. Further, it provides measurements of the test-retest reliability of the measurement tool and the stability of the behaviour across r...

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Section: Introductionmentioning

confidence: 99%

Reliability and stability of the metrical stress effect on segmental production accuracy in persons with apraxia of speech

Bailey

Bunker

Mauszycki

et al. 2019

Intl J Lang & Comm Disor

View full text Add to dashboard Cite

show abstract

“…Although distortion errors are considered a hallmark feature of AOS, some recent quantitative studies have reported higher than expected rates of distortion errors in people with APH (Bislick et al 2017, Scholl et al 2018. Of note, some of the participants here were those reported in the sample evaluated by Scholl et al (2018). The lack of change in lexical stress errors for the AOS group, with errors present on only approximately one of five items, is unsurprising.…”

Section: Effects Of Sfa On Treated Wordsmentioning

confidence: 50%

“…There was also a significant reduction in distortion errors for the APH group, presumably also related to the repeated production practice. Although distortion errors are considered a hallmark feature of AOS, some recent quantitative studies have reported higher than expected rates of distortion errors in people with APH (Bislick et al 2017, Scholl et al 2018. Of note, some of the participants here were those reported in the sample evaluated by Scholl et al (2018).…”

Section: Effects Of Sfa On Treated Wordsmentioning

confidence: 56%

“…2017, Scholl et al . 2018). Of note, some of the participants here were those reported in the sample evaluated by Scholl et al .…”

Section: Discussionmentioning

confidence: 99%

“…Of note, some of the participants here were those reported in the sample evaluated by Scholl et al . (2018). The lack of change in lexical stress errors for the AOS group, with errors present on only approximately one of five items, is unsurprising.…”

Section: Discussionmentioning

confidence: 99%

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Outcomes of semantic feature analysis treatment for aphasia with and without apraxia of speech

Scholl

McCabe

Nickels³

et al. 2021

Intl J Lang & Comm Disor

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Background:To date, studies have not explored whether a dual diagnosis of aphasia plus apraxia of speech (AOS) versus aphasia alone (APH) affects the response to language-based naming treatments. Aims: To compare the effects of semantic feature analysis (SFA) treatment for individuals with APH versus aphasia plus AOS, and to test if the presence of AOS impacted the effects of treatment. Methods and Procedures: A non-randomized experimental group study was conducted to explore the treatment, generalization and maintenance effects between the AOS and APH groups. Participants included nine individuals with aphasia and 11 with concomitant aphasia and AOS. Dependent measures included lexical accuracy, number of sound-level distortions, and lexical stress and syllable segmentation errors. Outcomes and Results: Both groups showed significantly improved naming accuracy of trained items for up to 2 months post-treatment. Improvement on naming accuracy of untrained items post-treatment, both semantically related and unrelated to trained items, was lower in magnitude. That this may have been due to effects of repeated probing (which included target repetition) or regression to the mean cannot be excluded. There was a tendency for the AOS group to respond slightly better to treatment than the APH group overall, which was not correlated with aphasia severity. Also, measures of phonetic accuracy and fluency improved for both groups, with no main effect of group. Treatment effects did not generalize to formal measures of (untrained) picture naming or expression of correct information units in discourse in a story retelling task. Conclusions and Implications: Findings indicate that individuals with aphasia plus AOS can gain equivalent benefits in word retrieval and production from the language-based SFA treatment as individuals with aphasia alone. This may be, in part, due to the tendency for SFA to incorporate principles of practice that are known to support motor learning in AOS, such as high intensity, random stimulus presentation and variable practice. Findings provide further support for high-intensity practice and use of self-generated features to facilitate maintenance of effects.

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Sound Distortion Errors in Aphasia With Apraxia of Speech

Haley

Smith

Wambaugh

2019

Am J Speech Lang Pathol

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Purpose Loosely defined diagnostic criteria for acquired apraxia of speech (AOS) limit clinicians' ability to diagnose the disorder validly and reliably. The purpose of this study was to contribute to the development of more precise diagnostic guidelines by characterizing the frequency and quality of sound distortion errors in speakers with clinically diagnosed AOS. Method Audio-recorded motor speech evaluations from 24 speakers with AOS and aphasia were analyzed by trained listeners using a narrow phonetic transcription protocol that included 12 distortion categories. We calculated percentage of segments transcribed with phonemic error, distortion error, and a combination of phonemic and distortion error. Results Distortion frequency varied substantially across participants, distributing on a continuum from 5% to 22% of segments. The frequency of phonemic errors was significantly greater than the frequency of distortion errors, which, in turn, was greater than the frequency of distorted substitution errors. The most common distortion qualities were voicing ambiguity and segment lengthening, but over 40% of distortion errors were distributed across an assortment of tongue modifications. Conclusions The results replicated observations from previous studies of speakers with quantitatively defined AOS in a new sample of participants with clinically diagnosed AOS. Similar distortion qualities were observed across studies, offering focus for diagnosticians and guidance for operationalizing future measures. The broad performance continua we observed help explain why binary classification of the presence/absence of AOS can be challenging and indicate a need to develop quantitative norms.

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Segmental and prosodic variability on repeated polysyllabic word production in acquired apraxia of speech plus aphasia

Cited by 14 publications

References 26 publications

Reliability and stability of the metrical stress effect on segmental production accuracy in persons with apraxia of speech

Reliability and stability of the metrical stress effect on segmental production accuracy in persons with apraxia of speech

Outcomes of semantic feature analysis treatment for aphasia with and without apraxia of speech

Sound Distortion Errors in Aphasia With Apraxia of Speech

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