Biomedical subjects

Bryan Gick

Publications and source records attributed to Bryan Gick.

6 recordsLinked to original sources

PubMed2005

Language-specific articulatory settings: evidence from inter-utterance rest position.

The possible existence of language-specific articulatory settings (underlying or default articulator positions) has long been discussed, but these have proven elusive to direct measurement. This paper presents two experiments using X-ray data of 5 English and 5 French subjects linking articulatory setting to speech rest position, which is measurable without segmental interference. Results of the first experiment show that speech rest position is significantly different across languages at 5 measurement locations in the vocal tract, and is similar to previously described language-specific articulatory settings. The second experiment shows that the accuracy of achievement of speech rest position is similar to that of a specified vowel target (/i/). These results have implications for the phonetics and phonology of neutral vowels, segmental inventories, and L2 acquisition.

Female↗

PubMed2005

Frequency and category factors in the reduction and assimilation of function words: EPG and acoustic measures.

Many studies have observed phonetic and phonological differences between function words and content words. However, as many of the most commonly cited function words are also very high in frequency, it is unclear whether these differences are the result of syntactic category or word frequency. This study attempts to determine whether syntactically defined function words are indeed phonologically and phonetically reduced or assimilated when word frequency is balanced. Three experiments were designed to distinguish the relative contributions of the factors of category and frequency on phonetic and phonological reduction and assimilation. Overall results suggest that syntactic category and word frequency interact with phonetic and phonological processes in a more complex way than previously believed. Experiment 1 measured final t/d dropping, a reduction process, using electropalatography (EPG). Experiment 2 examined vowel reduction using acoustic measures. In Experiment 3, palatalization, an assimilation process, was examined using EPG. Results showed that t/d dropping responds to the factor of syntactic category, whereas palatalization is affected by word frequency; vowel reduction responded to both factors, with a dominant syntactic category effect and a secondary within-category frequency effect. The implications of these findings for models of lexical representation and theories of language acquisition are discussed.

Electromyography↗

PubMedDate not supplied

Speech habilitation of hard of hearing adolescents using electropalatography and ultrasound as evaluated by trained listeners.

Four adolescents with moderate to severe sensorineural hearing losses and moderately unintelligible speech participated in a 14-week speech therapy study using two dynamic visual feedback technologies, electropalatography and ultrasound imaging. Electropalatography provides information about tongue-hard palate contact points. Ultrasound displays images of tongue shape and movement in two dimensions from the tip to the root. Treatment targets for all participants included a sibilant place contrast (/s/ versus /[symbol: see text]/), liquids /l/ and /[symbol: see text]/, and the tense-lax vowel contrast with the high vowels. Trained listener evaluations of pre- and post-treatment transcripts are reported in this paper. Significant improvements in speech production were noted across students and targets. Treatment targets improved significantly more than non-treatment test targets overall. Students showed greatest gains on consonants that were absent or marginal in their speech pre-treatment. No particular advantage of one technology over the other was evident in this sample.

Adolescent↗

PubMedDate not supplied

Techniques for field application of lingual ultrasound imaging.

Techniques are discussed for using ultrasound for lingual imaging in field-related applications. The greatest challenges we have faced distinguishing the field setting from the laboratory setting are the lack of controlled head/transducer movement, and the related issue of tissue compression. Two experiments are reported. First, a pilot study identifies important factors in controlling head/transducer movement in field settings. Second, an Optotrak/ultrasound study reports the range of head movement in an optimal field-like setting within and across varying phonetic contexts, as well as the effect of tongue tissue compression on tongue image data. Results suggest that with a simple arrangement involving a head rest or surface, a fixed transducer, and careful design and presentation of stimuli, reliable lingual ultrasound data can be collected in the field.

Adult↗

PubMedDate not supplied

Ultrasound in speech therapy with adolescents and adults.

The present paper comprises an overview of techniques using ultrasound in speech (re)habilitation. Ultrasound treatment techniques have been developed for English lingual stops, vowels, sibilants, and liquids. These techniques come from a series of small n studies with adolescents and adults with severe hearing impairment, residual speech impairment or accented speech at the Interdisciplinary Speech Research Laboratory at the University of British Columbia. Ultrasound allows excellent visualization of tongue shape features, which is especially useful for feedback during speech (re)habilitation. Further research is needed to evaluate the efficacy of ultrasound in speech (re)habilitation.

Adolescent↗

PubMedDate not supplied

An x-ray investigation of pharyngeal constriction in American English schwa.

A study of early X-ray footage of 4 subjects was conducted to test the prediction that there may be a midpharyngeal constriction in American English schwa. Results show a significant constriction during schwa relative to lingual rest position for all 4 speakers. This evidence contradicts views of American English schwa as having no articulatory target or place features, as well as those which have suggested a neutral target throughout the vocal tract. These findings, however, support claims connecting English schwa with reduced /r/. In addition to the basic effect 1 subject showed a bimodal pattern in schwa, which may indicate that this subject has distinct schwas in lexical vs. functional words, a property that has also been observed with respect to /r/ in r-vocalizing dialects.

Adult↗