Biomedical subjects

Allyson K Carter

Publications and source records attributed to Allyson K Carter.

5 recordsLinked to original sources

PubMed2004

Nonword imitation by children with cochlear implants: consonant analyses.

OBJECTIVES: To complete detailed linguistic analyses of archived recordings of pediatric cochlear implant users' imitations of nonwords; to gain insight into the children's developing phonological systems and the wide range of variability in nonword responses. DESIGN: Nonword repetition: repetition of 20 auditory-only English-sounding nonwords. SETTING: Central Institute for the Deaf "Education of the Deaf Child" research program, St Louis, Mo. PARTICIPANTS: Eighty-eight 8- to 10-year-old experienced pediatric cochlear implant users. MAIN OUTCOME MEASURES: Several different consonant accuracy scores based on the linguistic structure (voicing, place, and manner of articulation) of the consonants being imitated; analysis of the errors produced for all consonants imitated incorrectly. RESULTS: Seventy-six children provided a response to at least 75% of the nonword stimuli. In these children's responses, 33% of the target consonants were imitated correctly, 25% of the target consonants were deleted, and substitutions were provided for 42% of the target consonants. The children tended to correctly reproduce target consonants with coronal place (which involve a mid-vocal tract constriction) more often than other consonants. Poorer performers tended to produce more deletions than the better performers, but their production errors tended to follow the same patterns as the better performers. CONCLUSIONS: Poorer performance on labial consonants suggests that scores were affected by the lack of visual cues such as lip closure. Oral communication users tended to perform better than total communication users, indicating that oral communication methods are beneficial to the development of pediatric cochlear implant users' phonological processing skills.

Child↗

PubMed2002

Imitation of nonwords by hearing impaired children with cochlear implants: suprasegmental analyses.

In this study, we examined two prosodic characteristics of speech production in 8-10-year-old experienced cochlear implant (CI) users who completed a nonword repetition task. We looked at how often they correctly reproduced syllable number and primary stress location in their responses. Although only 5% of all nonword imitations were produced correctly without errors, 64% of the imitations contained the correct syllable number and 61% had the correct placement of primary stress. Moreover, these target prosodic properties were correctly preserved significantly more often for targets with fewer syllables and targets with primary stress on the initial syllable. Syllable and stress scores were significantly correlated with measures of speech perception, intelligibility, perceived accuracy, and working memory. These findings suggest that paediatric CI users encode the overall prosodic envelope of nonword patterns, despite the loss of more detailed segmental properties. This phonological knowledge is also reflected in other language and memory skills.

Articulation Disorders↗

PubMed2002

Prosodic effects on word reduction.

It is widely known that English-speaking children reduce words by omitting syllables in certain predictable patterns (e.g., banána --> nána). One way to better understand the nature of phonological reductions in children is to examine adults' word reduction behavior. This study explored whether adults produce predictable output patterns when reducing words. Undergraduate participants heard a list of polysyllabic words varying systematically across syllable number and primary stress location and were asked to generate a "reduced" form, similar to common English reductions (e.g., rhinóceros --> rhino). Regardless of stress and syllable number, participants reduced the stimulus words significantly more often to left-headed disyllabic or monosyllabic feet, retaining stressed syllables and omitting unstressed syllables. The general bias found was similar to that which children exhibit in natural speech, namely, to maintain well-formed prosodic patterns and preserve salient syllables. On the other hand, a tendency to preserve word-initial instead of word-final syllables was also found, suggesting subtle differences in language processing between children and adults. The current study contributes to the psycholinguistic literature on adults' syllable omissions in abbreviations and fast-speech registers by examining the processing strategies that adults may use when reducing words.

Adult↗

PubMedDate not supplied

Similarities in weak syllable omissions between children with specific language impairment and normally developing language: a preliminary report.

UNLABELLED: Two-year-olds with normally developing language (NL) and older children with specific language impairment (SLI) omit initial weak syllables from words (e.g., "banana" approximately "nana"). Previous research revealed a phonetic "trace" of syllables omitted by children with NL (Carter, 1999; Carter & Gerken, submitted for publication). The present study asked whether similar evidence could be found for omissions by children with SLI. Fourteen children with SLI produced sentences containing reduced or unreduced disyllabic proper names (e.g., "Feed_cinda," from "Feed Lucinda" vs. "Feed Cindy"). Acoustic analyses revealed a significantly longer duration for verb-onset to name-onset of sentences containing the reduced name, indicating that although segmental material is omitted, an acoustic trace remains. In addition, a phonological examination showed similarities between groups regarding sentential and syllabic factors that affect omission rates, as well as an interesting difference that suggests different strategies the groups use in acquiring adult targets. LEARNING OUTCOMES: As a result of reading this article, participants should (1) have a better understanding of similarities and differences in the language production of children with specific language impairment and normally developing language, with regard to prosodic development, (2) be familiar with several models of the phenomenon of weak syllable omissions in children's developing language, and (3) recognize the importance of using a combination of linguistic analysis types when studying issues in child language production.

Child↗

PubMedDate not supplied

Imitation of nonwords by hearing-impaired children with cochlear implants: segmental analyses.

The phonological processing skills of 24 pre-lingually deaf 8- and 9-year-old experienced cochlear implant users were measured using a nonword repetition task. The children heard recordings of 20 nonwords and were asked to repeat each pattern as accurately as possible. Detailed segmental analyses of the consonants in the children's imitation responses were carried out. Overall, 39% of the consonants were imitated correctly. Coronals were produced correctly more often than labials or dorsals. There was no difference in the proportion of correctly reproduced stops, fricatives, nasals, and liquids, or voiced and voiceless consonants. Although nonword repetition performance was not correlated with the children's demographic characteristics, the nonword repetition scores were strongly correlated with other measures of the component processes required for the immediate reproduction of a novel sound pattern: spoken word recognition, language comprehension, working memory, and speech production.

Acoustic Stimulation↗