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The Arizona Child Acoustic Database consists of longitudinal audio recordings from a group of children over a critical period of growth and development (ages 2-7 years). The goal of this database is to 1) document acoustic changes in speech production that may be related to physical growth 2) inform development of a model of speech production for child talkers. This work was funded by NSF BSC-1145011 awarded to Kate Bunton, Ph.D. and Brad Story, Ph.D, Principal Investigators. This database contains longitudinal audio recordings of 55 American English speaking children between the ages of 2-7 at 3-month intervals. Since children began the study at different ages, some children have fewer recording sessions than others. The database can also be used to provide cross-sectional data for children of a specific age. Please refer to the subject data table for information on specific sessions available here http://arizona.openrepository.com/arizona/handle/10150/316065. All children were recorded using the same protocol; therefore, task numbers are consistent across children and sessions. A calibration tone is included as Record 1 for all sessions. The speech protocol focused on production of English monopthong and diphthong vowels in isolation, sVd, hVd, and monosyllabic real words. In addition, the protocol includes several nonsense vowel-to-vowel transitions. Speakers were prompted either verbally by investigators or by graphical prompts. Details of the protocol with reference to task numbers can be found in the protocol spreadsheet available here http://arizona.openrepository.com/arizona/handle/10150/316065. Details on data recording: All samples were recorded digitally using an AKG SE 300B microphone with a mouth to mic distance of approximately 10 inches. Signals were recorded digitally using a Marantz PMD671, 16 bit PCM (uncompressed) at 44.1KHz. Recordings are made available in .wav format. Individual zip files contain all recordings from a single session.

The Arizona Child Acoustic Database consists of longitudinal audio recordings from a group of children over a critical period of growth and development (ages 2-7 years). The goal of this database is to 1) document acoustic changes in speech production that may be related to physical growth 2) inform development of a model of speech production for child talkers. This work was funded by NSF BSC-1145011 awarded to Kate Bunton, Ph.D. and Brad Story, Ph.D, Principal Investigators. This database contains longitudinal audio recordings of 55 American English speaking children between the ages of 2-7 at 3-month intervals. Since children began the study at different ages, some children have fewer recording sessions than others. The database can also be used to provide cross-sectional data for children of a specific age. Please refer to the subject data table for information on specific sessions available here http://arizona.openrepository.com/arizona/handle/10150/316065. All children were recorded using the same protocol; therefore, task numbers are consistent across children and sessions. A calibration tone is included as Record 1 for all sessions. The speech protocol focused on production of English monopthong and diphthong vowels in isolation, sVd, hVd, and monosyllabic real words. In addition, the protocol includes several nonsense vowel-to-vowel transitions. Speakers were prompted either verbally by investigators or by graphical prompts. Details of the protocol with reference to task numbers can be found in the protocol spreadsheet available here http://arizona.openrepository.com/arizona/handle/10150/316065. Details on data recording: All samples were recorded digitally using an AKG SE 300B microphone with a mouth to mic distance of approximately 10 inches. Signals were recorded digitally using a Marantz PMD671, 16 bit PCM (uncompressed) at 44.1KHz. Recordings are made available in .wav format. Individual zip files contain all recordings from a single session.

Submitted by Priscila Biaggi Alves De Alencar (priscilabiaggi@gmail.com) on 2018-08-22T18:47:45Z No. of bitstreams: 1 Dissertação Priscila Biaggi Alves Alencar.pdf: 1404136 bytes, checksum: ffafc2ac51d109d295358abc672edd41 (MD5) / Approved for entry into archive by Satie Tagara (satie@marilia.unesp.br) on 2018-08-23T13:34:50Z (GMT) No. of bitstreams: 1 alencar_pba_me_mar.pdf: 1404136 bytes, checksum: ffafc2ac51d109d295358abc672edd41 (MD5) / Made available in DSpace on 2018-08-23T13:34:50Z (GMT). No. of bitstreams: 1 alencar_pba_me_mar.pdf: 1404136 bytes, checksum: ffafc2ac51d109d295358abc672edd41 (MD5) Previous issue date: 2018-07-30 / Não recebi financiamento / Objetivo: comparar aspectos das disfluências presentes na fala, no que diz respeito à gagueira do desenvolvimento, o transtorno fonológico e as duas desordens em comorbidade, caracterizando as suas respectivas manifestações. Hipotetizou-se que crianças com gagueira apresentam uma maior frequência de ocorrência tanto em relação às outras disfluências quanto em relação às disfluências típicas da gagueira comparativamente às crianças com transtorno fonológico e crianças que apresentam ambos os distúrbios em comorbidade; crianças com transtorno fonológico se diferem daquelas que apresentam gagueira e daquelas que apresentam gagueira e transtorno fonológico em comorbidade no tocante à tipologia das disfluências. Método: Foram selecionados 30 sujeitos, entre 4 e 11 anos, 10 com diagnóstico de transtorno fonológico, 10 com diagnóstico de gagueira do desenvolvimento e 10 com os dois diagnósticos em comorbidade. Os procedimentos da pesquisa foram distribuídos em duas etapas: avaliação da fluência da fala e avaliação da fonologia. Para tal, foi realizada a coleta de uma amostra de fala espontânea com 200 sílabas fluentes. Os dados foram submetidos à análise estatística. Resultados: as crianças com diagnóstico de gagueira do desenvolvimento apresentaram maior ocorrência das outras disfluências comparadas às crianças com transtorno fonológico, porém não se diferiram das crianças com as duas desordens em comorbidade. No tocante à tipologia das disfluências, as crianças com transtorno fonológico se diferiram principalmente daquelas com os diagnósticos em comorbidade de gagueira do desenvolvimento e transtorno fonológico no que diz respeito às disfluências típicas da gagueira denominadas repetição de palavras monossilábicas, repetição de parte da palavra e prolongamentos. A diferença estatística relevante para as outras disfluências ocorreu apenas na tipologia “interjeição” com diferença entre crianças com transtorno fonológico e crianças com diagnóstico de gagueira do desenvolvimento. Quando comparadas às crianças com gagueira do desenvolvimento e com os distúrbios em comorbidade, as crianças com transtorno fonológico se diferenciaram na ocorrência da variável “bloqueio”. Conclusão: As duas hipóteses foram confirmadas parcialmente. Em relação à frequência de ocorrência, as crianças com transtorno fonológico apresentaram menor frequência de ocorrência de disfluências típicas da gagueira em comparação às crianças com gagueira e com as desordens em comorbidade, assim como não houve diferença quanto à frequência de ocorrência entre as disfluências típicas da gagueira e outras disfluências entre crianças que apresentam a gagueira do desenvolvimento e crianças com ambos os distúrbios em comorbidade. No que se refere à tipologia das disfluências, apenas determinadas tipologias das disfluências típicas da gagueira e outras disfluências apresentaram diferenças significantes entre os grupos conforme evidenciado nos resultados. / Objective: compare aspects of speech dysfluencies in terms of developmental stuttering, phonological disorder and the two disorders in comorbidity, characterizing their respective manifestations. It has been hypothesized that children with stuttering have a higher frequency of occurrence both in relation to the other disfluencies and in relation to the typical stuttering dysfluencies compared to children with speech sound disorder and children who present both disorders in comorbidity; children with speech sound disorder are different from those with stuttering and those with stuttering and speech sound disorder in comorbidity regarding the typology of disfluencies. Methods: A total of 30 subjects, aged between 4 and 11 years, 10 with diagnosis of speech sound disorder, 10 with diagnosis of developmental stuttering and 10 with both diagnoses in comorbidity were selected. The procedures of the research were distributed in two stages: speech fluency evaluation and phonology evaluation. For this, a sample of spontaneous speech with 200 fluent syllables was collected. The data were submitted to statistical analysis. Results: children with diagnosis of developmental stuttering had a higher occurrence of other dysfluencies compared to children with speech sound disorder, but did not differ from children with both disorders in comorbidity. Regarding the typology of disfluencies, children with speech sound disorder differed mainly from those with diagnoses of developmental stuttering comorbidity and phonological disorder with respect to stuttering-like disfluencies called repetition of monosyllabic words, repetition of part of the word and prolongations. The statistical difference relevant to the other disfluencies occurred only in the "interjection" typology with difference between children with phonological disorder and children with diagnosis of developmental stuttering. When compared to children with developmental stuttering and comorbid disorders, children with phonological disorder differed in the occurrence of the "blocking" variable. Conclusion: Both hypotheses were partially confirmed. Regarding the frequency of occurrence, children with phonological disorder had a lower frequency of stuttering-like disfluencies than did children with stuttering and comorbid disorders, as there was no difference in the frequency of stuttering-like disfluencies and other disfluencies among children who present developmental stuttering and children with both disorders in comorbidity. Regarding the typology of disfluencies, only certain typologies of stuttering-like disfluencies and other disfluencies presented significant differences between groups as evidenced in the results.

The Arizona Child Acoustic Database consists of longitudinal audio recordings from a group of children over a critical period of growth and development (ages 2-7 years). The goal of this database is to 1) document acoustic changes in speech production that may be related to physical growth 2) inform development of a model of speech production for child talkers. This work was funded by NSF BSC-1145011 awarded to Kate Bunton, Ph.D. and Brad Story, Ph.D, Principal Investigators. This database contains longitudinal audio recordings of 55 American English speaking children between the ages of 2-7 at 3-month intervals. Since children began the study at different ages, some children have fewer recording sessions than others. The database can also be used to provide cross-sectional data for children of a specific age. Please refer to the subject data table for information on specific sessions available here http://arizona.openrepository.com/arizona/handle/10150/316065. All children were recorded using the same protocol; therefore, task numbers are consistent across children and sessions. A calibration tone is included as Record 1 for all sessions. The speech protocol focused on production of English monopthong and diphthong vowels in isolation, sVd, hVd, and monosyllabic real words. In addition, the protocol includes several nonsense vowel-to-vowel transitions. Speakers were prompted either verbally by investigators or by graphical prompts. Details of the protocol with reference to task numbers can be found in the protocol spreadsheet available here http://arizona.openrepository.com/arizona/handle/10150/316065. Details on data recording: All samples were recorded digitally using an AKG SE 300B microphone with a mouth to mic distance of approximately 10 inches. Signals were recorded digitally using a Marantz PMD671, 16 bit PCM (uncompressed) at 44.1KHz. Recordings are made available in .wav format. Individual zip files contain all recordings from a single session.

This study investigated whether or not variability in the severity of speech sound disorders is related to variability in phonological short-term memory and/or variability in the accuracy of phonological representations. The aim was to determine speech processing predictors of severity of speech sound disorders. A total of 33 children, aged three to six years of age, were assessed on measures of nonword repetition, accuracy of phonological representations, accuracy of speech production, and language. The tests administered included the Clinical Evaluation of Language Fundamentals Preschool – 2 Australian, the Diagnostic Evaluation of Articulation and Phonology, the Nonword Repetition Test (modified), and the Phonological Representation Judgement Task (modified). The relationships between the results of these tests were established using a correlation analysis. The relationship between accuracy of phonological representations and the percentage of consonants correct was found to be mediated by language. There was no significant relationship between nonword repetition and percentage consonants correct. These findings may have been the result of small sample size, age of the participants, or co-morbid language difficulties. These findings imply that variability in severity of speech sound disorders may be related to a variable not directly assessed in this study. This variable may be a constraint relating to the stored motor programs within children’s speech processing systems. Implications for future research are discussed.

This study aimed to describe the phonological development of Setswana-speaking children between the ages of 2;0 and 6;5 years. The study objectives were to: 1) describe the acquisition of four aspects of phonology in these children, namely vowels, consonants, lexical tone and phonological processes; 2) contrast Setswana phonological development in monolingual vs multilingual children; and 3) contrast typical vs atypical Setswana speech acquisition and determine the occurrence and nature of speech sound disorders in children acquiring Setswana. The participant group comprised 81 children from the North-West Province of South Africa. All children were attending preschool and were acquiring one of two varieties of Setswana investigated in this study, namely Sekwêna and Setlhaping. Sixty-five participants were acquiring Sekwêna and were recruited from Hebron, and the remaining 16 participants were acquiring Setlhaping and were recruited from Dry-Harts village. The study used a cross-sectional design to detail the stages of phonological development in children aged 2;0–6;5 years. For each of the varieties studied, participants were assigned to groups of six-month age bands (e.g. 2;6– 2;11 years). Findings add to data from a preliminary pilot study on the acquisition of Setswana segmental phonology (Mahura, 2014; Mahura & Pascoe, 2020). Prior to obtaining speech samples from Setswanaspeaking children, revisions were made to the assessment developed in the pilot study. This was done by addressing a number of limitations which had been documented following its use, including ensuring that all consonant phonemes were targeted in the initial word and penultimate syllable positions, as well as including syllabic consonants in these word positions. The picture stimuli were also changed, and an expert panel assessed the revised word list to ensure that all words were linguistically and culturally appropriate. Participants' speech was transcribed online using IPA symbols and audio recorded for later re-transcription to ensure reliability. The findings indicate that children acquiring Setswana have a full set of vowels in their phonetic inventories as early as 2;6 years, and possibly earlier. A large number of consonant phonemes occurring in the Setswana phonological system had either been acquired or mastered by 2;6–2;11 years. This was seen word-initially and in the penultimate syllable position, with only three phonemes still to be acquired at this age word-initially: only two phonemes with rounding, velar plosive /kʷʼ/ and alveolar nasal /nʷ/, were still emerging at 2;6–2;11 years and seen to be acquired at 3;0–3;5 years in the initial word position and voiced palato-alveolar affricate /ʤ/ was absent at 2;6–2;11 years. This phoneme was, however, seen to emerge in the 3;0–3;5-year group. Heterorganic compounds in the initial word position mainly consisted of /fj/ and were only seen in the speech of children who speak the Sekwêna variety. Conclusions on the age at which heterorganic compound /fj/ is acquired could not be made as it was not used by all children acquiring the Sekwêna variety, but instead observed in the speech of several participants across the different age bands. Although consonant clusters were not included in the consonant phonemes elicited as part of this study, they were noted in the inventories of children across the different age groups. A clear reduction in the occurrence of phonological processes was seen across age group, a pattern of development that can be expected in typically-developing children. Some of the phonological processes seen in Setswana-speaking children included assimilation (eliminated after 6;5 years), fronting (eliminated at 3;6 yeas), and stopping (eliminated at 4;0 years). Correct use of lexical tone was observed as early as 2;6–2;11 years. Furthermore, the speech sound skills of bi/multilingual children were found to be comparable to their monolingual peers, and sometimes slightly more advanced. Findings are related to existing theoretical frameworks used to describe speech sound acquisition. While the findings from this study are not yet generalisable to all Setswana-speaking children, they indicate that theoretical frameworks such as Stackhouse and Wells' (1997) psycholinguistic approach and Dodd's (1995; 2005) diagnostic framework can be applied to Setswana. Language specific differences that should be taken into account are presented. This data adds to knowledge on speech sound acquisition in Setswana-speaking children, urgently needed for the early assessment and identification of children with speech difficulties, which has been lacking to date. When speech difficulties are identified and addressed early, children's academic, psychosocial and life outcomes can be improved, but Setswana-speaking children are often not well served by speech and language therapists in South Africa due to a lack of relevant information and resources. This study set out to redress this situation. Lines for future research include using a larger sample of participants to allow data to be more generalisable, developing assessments for speech input processing as well as production and considering aspects of tone more comprehensively.

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Childhood apraxia of speech (CAS) is a motor-based disorder that often results in long-term communication challenges, as well as adverse academic and psychosocial consequences. Response to CAS treatment is variable, with some children achieving slow or limited progress. A better understanding of factors associated with treatment response is needed to generate accurate prognoses and guide future development of efficient, targeted treatments. This dissertation research includes two studies. Study 1 examined speech perception skills among children with CAS using a discrimination (AX) task and a mispronunciation detection (MPD) task. Study 2 examined the association between four individual-level characteristics—age, speech accuracy, inconsistency, and perception—and CAS treatment response. Participants included 27 children (Study 2; subset of 12 children for Study 1) involved in an ongoing clinical trial for CAS (i.e., the “parent trial;” ClinicalTrials.gov ID = NCT03903120). Research questions were addressed using nonparametric correlation and t-tests, as well as multivariable linear regression. Results from Study 1 indicated that speech perception ability (1) did not differ by task, (2) did not differ by consonant and vowel conditions, (3) was positively correlated with age and speech accuracy, and negatively associated with speech inconsistency and nonverbal cognition, and (4) did not change after integral stimulation treatment. Results from Study 2 indicated that speech perception ability was the sole significant predictor of CAS treatment response, such that children with better perceptual skills at baseline made greater treatment gains. Further research is needed to replicate and extend these findings. / Communication Sciences

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