Masking Level Difference (MLD) tests are an established component of auditory processing test batteries; however, normative data for these tests vary according to procedure. In this study, forty normal, native-English speaking adults between the ages of 18 and 26 were tested for MLD via a newly developed computer software program using both an adaptive procedure (MLDA) and a Bekesy procedure (MLDB). The results from the two procedures were analyzed for sex differences and compared with each other. For both the MLDA and MLDB, the results showed statistically significant sex differences in the masked thresholds used to obtain the MLD (NoSo and NoSπ), but no significant difference in the calculated MLD value (NoSo - NoSπ). These results suggest that since the MLD was similar for both sexes, the normative data need not be reported separately by sex. The results also showed statistically significant differences between procedures, with the MLDA procedure producing higher MLDs than the MLDB procedure. The MLDA procedure lent itself to a d´ analysis, which could not be determined using MLDB due to the nature of a Bekesy assessment. For MLDA, d´ = 1.4, test sensitivity = 96.4%, and test specificity = 60.3%. The results of this study indicate that MLDA is a better testing procedure due to MLDA's higher MLD average and the statistical data available (d´, and measures of sensitivity and specificity) when using the MLDA procedure.

For many years, speech recognition threshold (SRT) testing has been used as an indicator of audiologic health. However, with changing methods and technology, test-retest reliability has not been reviewed extensively with newer digitally recorded spondaic words which meet a published criterion of listener familiarity. This study examined the test-retest reliability of 33 high frequency usage and psychometrically equated spondaic words. The American Speech-Language-Hearing Association recommended method (2-dB decrements) was used to measure the left and right SRT of 40 participants using both male and female talker recordings. For each participant, four SRTs were found during the test condition and four SRTs were found during the retest condition. All of the SRT scores were analyzed and the averaged SRT values found using a male talker recording resulted in an average retest SRT to be 1.4 dB better than the average test SRT. The averaged SRT values found using a female talker recording resulted in an averaged retest SRT to be 1.2 dB better than the averaged test SRT. The SRT scores also showed high validity when compared to each participant's pure tone average (PTA). This study additionally found no significant interaction in using a male versus a female talker when using digitally recorded and psychometrically equated spondaic words.

Current methods of selection of amplification are not readily applicable to children, and relatively few alternatives have been explored. Consequently, the audiologist must make a number of rather arbitrary judgements with little concrete information to support his recommendation of a given instrument. He has limited means of clinically determining the sustainability of the instrument for the child. This study was designed to explore the relationship between several factors which may add to the existing body of data related to the problems of amplification in children. In brief, the problem was to determine the various electrical and acoustical characteristics of hearing aids worn by children under study. A comparison of this information with hearing loss data would be studied to aid in understanding what relationships (if any) exist between the two measures. If in fact there is a relationship between the factors of hearing loss and hearing aid characteristics, this information may provide a more comprehensive and precise means of examining a given hearing aid in view of the hearing loss specific to each child. While this information may be preliminary in nature, it has application in the development of ongoing programs of evaluation and maintenance of hearing aids. A brief comparison of the present performance of the instrument with both the original performance levels and the child’s current needs would appear to be an integral part of such a program.

The current study examined the effect of different rate change approaches on speech movement patterns, including increasing and decreasing speaking rate volitionally, as well as with delayed auditory feedback (DAF). There were 10 participants, five male and five female, with a mean age of 25 years. All were typical speakers. Participants spoke the sentence “Don’t fight or pout over a toy car” under slow, fast and DAF speaking conditions. A total of 5 sensors were glued to each participant’s tongue, teeth, and lips. NDI Wave electromagnetic articulography recorded the articulatory movements from these sensors as the participants spoke. Metrics for the individual movement strokes, or articulatory gestures, were calculated based on the movement speed of the articulators during the target utterance. Ten tokens of the target utterance were analyzed for stroke count, stroke speed, duration, and hull area. Vertical movements of the tongue, jaw, lips, and lip aperture were used to calculate the spatiotemporal index to assess variability in speech movements across 10 sentence repetitions. Statistical analysis revealed that articulatory patterns changed significantly in slower speech. A speaker’s efforts to naturally decrease speech rate affected articulation patterns more than did the fast and DAF conditions. Findings from this study can be used as a foundation for future studies with dysarthric individuals, which may increase our understanding of mechanisms of change in the remediation of disordered speech.

The COVID-19 pandemic increased uncertainty and anxiety for most and was especially disruptive to autistic people and their families. Autistic children were particularly vulnerable due to their intolerance for increased uncertainty and disruption to their school and therapy support. This study aimed to investigate the effect that increased uncertainty had on autistic children, specifically their sensory behaviors and stress levels and on the stress levels of their primary caregivers. Parents and guardians of 47 autistic children completed an online survey consisting of questions investigating background and demographic information, their experiences during the first six months of the pandemic, information about the types of support that they were provided, and measures of intolerance of uncertainty (IUS-12) and sensory processing (SSP). Additionally, 10 primary caregivers participated in semi-structured interviews to explore in-depth accounts of their experiences and those of their children during the pandemic. Eighty nine percent of caregivers reported their children had significant sensory difficulties prior to the pandemic. We found that this majority group showed significant increases in sensory processing and intolerance of uncertainty from pre to during the first six months of the pandemic. Changes from pre to during the first six months of the pandemic were significantly correlated suggesting that as uncertainty increased, sensory processing ability decreased. Disruption to routines was significantly correlated with sensory processing and explained a significant portion of the variance in child, household, and parent stress. The themes found in interview responses including the relationship between sensory processing and uncertainty, living in "survival mode,"and unmasking reflect the quantitative findings, showing that the uncertainty introduced by disrupted routines increased sensory processing difficulty and typically autistic behaviors. These findings have implications for helping us to understand the relationship between uncertainty, sensory processing, and stress leading to better interventions and supports for this population. Additionally, primary caregivers noted the need for increased education and training for parents during therapy sessions and for a stronger community of primary caregivers to support the unique needs of these individuals and families.

State standards require kindergarten students to produce expository writing, but little research has been done regarding their abilities in this area. This study describes expository writing samples of 47 typically developing (TD) kindergarteners and 43 kindergarteners with developmental language disorder (DLD). The Expository Language Measures (ELM) Flow Chart and the Systematic Analysis of Language Transcripts (SALT) software were used to detail the language complexity and text structure features the children in the sample produced. When comparing TD and DLD children's expository written samples, no significant differences in the language and text structure measures were found. It is important to continue acquiring data regarding young children's abilities to produce expository written language. Identifying norms and areas of weakness promotes the creation of more specific and effective teaching and intervention methods.

As the population of Spanish-English bilingual children in the United States steadily grows, the importance of accurately assessing and diagnosing developmental language disorder (DLD) has also grown. Understanding a child's underlying language learning system is critical in this process. Several studies have demonstrated the efficacy of nonword repetition (NWR) tasks in bilingual children across a wide range of development, however there is little information regarding guidelines for interpretation of NWR performance or analyzing error patterns. This study was conducted to address these gaps in the research. A sample of 26 Spanish-English bilingual school aged children (6;0-9;4) were administered English and Spanish NWR, recalling sentences, and narrative tasks. Total errors, as well as errors of omission and substitution were examined across tasks, languages, and language group (typically developing-TD and developmental language disorder- DLD). Descriptive statistics revealed that DLD children made a higher number of errors across language tasks in Spanish and English than their TD peers. Group membership predicted total errors in the Spanish NWR task while controlling for age and language proficiency. Language proficiency was not a significant predictor for any of the error types above and beyond group membership. Therefore, when age and language input/output were controlled for, language ability was best predictor of the number of errors. Additionally, results showed stronger correlations between Spanish across all three language tasks in TD children and in English across two language tasks in DLD children. According to the results of the current study, total errors is the only effective error measure of language ability. However, looking at error patterns across language and language group can be informative regarding bilingual children's language learning systems. Future research should be conducted to repeat the study with a larger sample size and investigate the difference in error patterns between languages in TD and DLD children.

The purpose of this thesis was to examine the preliminary validity of a newly developed dynamic assessment of narrative language in Mandarin Chinese. Two studies are reported in this thesis. Study 1 included 31 second grade participants and Study 2 included 43 first grade participants. All participants were enrolled in a Chinese immersion program in an elementary school in Utah. A dynamic assessment of narrative language was administered to each participant in Mandarin Chinese. A teacher rating was also included in Study 1. Results indicated that the dynamic assessment investigated in this thesis demonstrated some similar characteristics with other valid dynamic assessments of narrative language. As hypothesized, participants in Study 1 made gains from pretest to posttest after the teaching phase. Gain score from pretest to posttest and static teacher rating did not significantly correlate with modifiability rating. Modifiability rating and posttest score were significantly correlated in both studies. There is also no significant group difference between the participants in Study 1 and Study 2 on modifiability rating. These results are promising. However, more research will need to be conducted to further examine the dynamic assessment due to the limitations of the current studies.

The purpose of the current study was to examine and compare relative and absolute reliability estimates between brief, linguistically compact narrative retells and longer, more linguistically diffuse narrative retells. The participants included 190 school-age children in firstsixth grade from Utah, Arizona, and Colorado. Participants completed two brief narrative retells using the Narrative Language Measures (NLM) Listening subtest of the CUBED assessment and one longer narrative retell using the wordless picture book Frog, Where Are You? (FWAY). These language samples were then analyzed for language productivity, complexity, and story grammar elements using the Systematic Analysis of Language Transcripts software program and the NLM Flow Chart. Analyses of relative reliability reveal that there are significant differences across all measures, when controlled for length, except for mean length of utterance in words. The language measures are higher in the shorter narrative NLM condition, while inclusion of story grammar is higher in the longer FWAY narrative retell. Additionally, all productivity and complexity measures have moderate to strong correlations between the NLM and FWAY narrative retells. Analyses of absolute reliability shows the FWAY narrative retell to demonstrate less variance across all measures when compared to the NLM, indicating that measures are more stable in the longer sample. Although the brief narrative retells does not demonstrate a sufficient degree of relative or absolute reliability, this study indicates that clinicians may be able to elicit brief narrative retells from school-age children without losing meaningful information on language complexity and productivity measures.

Animal models are used extensively in voice research to study aspects of phonation, including physiology, kinematics, structure, and histology. Animals such as dog, cow, pig, sheep, deer, monkey, ferret, and rabbit have been used in voice research, with pig being one of the most common models. It is thought that the pig larynx is highly similar to the human larynx and one of the best models used in animal translational research. As with any model, however, the pig larynx does have some limitations. Perhaps a limitation most important to the rationale of this investigation is that pigs are difficult animals to study in vivo. Maintenance for a pig is challenging due to its large size and the variability of phonation use in the animal. Therefore, viable and practical alternatives are needed for in vivo voice research. The current study collected preliminary normative data from an alternate animal model, the rabbit, which has been used more recently in studies to model human phonation. The rabbit model was chosen due to its histological similarities to humans, in vivo phonation patterns, size, and practicality. The rabbit represents a more practical model for some longitudinal designs, as well as ex vivo phonatory models with aerodynamic measures as the primary variables. The current study involved a comparison of two aerodynamic measures, specifically phonation threshold pressure (PTP) and phonation threshold flow (PTF) between two groups, pig and rabbit larynges. The purpose of this study was to determine normative aerodynamic values for rabbits and to compare these with normative values for pigs during excised larynx benchtop phonation. Each group consisted of 15 larynges that were finely dissected to reveal the true vocal folds. Each larynx was then connected to a pseudolung and humidified air was passed through it. Fifteen phonation trials were elicited and the results averaged for each larynx. The results indicated that PTP and PTF were significantly different between the two groups, with PTP and PTF being lower for the rabbit group. Additionally, PTP values for rabbits were closer than pigs to the typical human value; however, some methodological challenges to rabbit benchtop models, including size and structural integrity, also exist. But the results from this study indicate that rabbits should be considered a viable option for voice research that would be more feasible with a small animal option that translates well to humans than a large animal option.