Variability is intrinsic to human speech production. One approach to understand variability in speech is to decompose it into task-irrelevant ("good") and task-relevant ("bad") parts with respect to speech tasks. Based on the uncontrolled manifold (UCM) approach, this dissertation investigates how vowel token-to-token…

Purpose: The aim of this study was to characterize speech acoustics in bilingual preschoolers who speak Jamaican Creole (JC) and English. We compared a standard approach with a culturally responsive approach for characterizing speech sound productions. Preschoolers' speech productions were compared to adult models from the same linguistic…

The study analysed spectral and tongue shape dynamics of voiceless alveolar and postalveolar fricatives produced by ten children learning Scottish English. Synchronised ultrasound tongue imaging data and acoustic data were used to characterise children's productions of the phonemic contrast. Six children had consistently accurate productions of…

This dissertation investigates Voice Onset Time (VOT), which serves as an essential property for differentiating plosive consonants in L1 and L2 Mandarin Chinese. It surveys VOT variations and demonstrates that they are affected by several phonetic and phonological properties, e.g., lexical tone, place of articulation (POA), speech rate,…

Child speech is highly variable. The speech apparatus--the vocal tract, tongue, teeth, and vocal folds--develop at different rates for different children, which helps explain some of the variability in children's speech. For example, the ratio of the oral to pharyngeal cavities changes as children age, making it difficult to establish reliable…

Foreign accent syndrome (FAS) is an acquired neurologic disorder in which an individual suddenly and unintentionally speaks with an accent which is perceived as being different from his/her usual accent. This study presents an acoustic-phonetic description of two Quebec French-speaking cases. The first speaker presents a perceived accent shift to…

The core objective of this study was to examine whether acoustic variability of vowel production in American English, across speaking tasks, is systematic. Ten male speakers who spoke a relatively homogeneous Wisconsin dialect produced eight monophthong vowels (in hVd and CVC contexts) in four speaking tasks, including clear-speech, citation form,…

Speech utterances are more than the linear concatenation of individual phonemes or words. They are organized by prosodic structures comprising phonological units of different sizes (e.g., syllable, foot, word, and phrase) and the prominence relations among them. As the linguistic structure of spoken languages, prosody serves an important function…

Studies palatization gestures in the production of /t/ and /d/ in standard Belgium French through the use of electropalatography. The articulatory results are compared with an acoustic study of the affricated realization of these consonants when followed by /i/, /y/, /j/, and /h/ in Quebec French. (Author/VWL)

Fricative spectral data are compared with articulatory data from electropalatographic (EPG) recordings in an investigation of coarticulatory effects on the acoustic signal. Data were taken from CV tokens produced by four female speakers of Australian English. Results are presented for coronal fricatives in seven monothong vowel contexts.…

This collection of papers on linguistic experiments includes: "Initial Tones and Prominence in Seoul Korean" (Ken de Jong); "The Domains of Laryngeal Feature Lenition Effects in Chonnam Korean" (Sun-Ah Jun); "The Timing of Lip Rounding and Tongue Backing for /u/" Gina M. Lee); "Prosody and Intrasyllabic Timing in…

Reports of research in phonetics and psycholinguistics include: "Interaction with Autonomy: Defining Multiple Output Models in Psycholinguistic Theories" (Julie E. Boland, Anne Cutler); "Vocal Tract Evolution and Vowel Production" (K. Bretonnel Cohen); "Final Lowering in Kipare" (Rebecca Herman); "Gestural…