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Speech Pathology and Audiology

2019

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Full-Text Articles in Speech and Hearing Science

Vocal Health Preservation For Teachers Of Music: A Literature Review, Lyndsay Byers, Lisa Vinney Phd Ccc-Slp, Kimberly Adelman Ms Ccc-Slp Dec 2019

Vocal Health Preservation For Teachers Of Music: A Literature Review, Lyndsay Byers, Lisa Vinney Phd Ccc-Slp, Kimberly Adelman Ms Ccc-Slp

Graduate Independent Studies - Communication Sciences and Disorders

This literature review explores research findings regarding risk factors of voice disorders for teachers of music. It summarizes current research regarding personal, environmental, and occupational practices teachers of music can implement to help preserve their voices. This document also reviews literature findings regarding when, where, and how music teachers can seek assistance for voice symptoms.


Long-Term Effects Of A Short-Term Study Abroad On Mindset, Madasyn Hofstedt, Heidi Harbers, Amy Yacucci Dec 2019

Long-Term Effects Of A Short-Term Study Abroad On Mindset, Madasyn Hofstedt, Heidi Harbers, Amy Yacucci

Graduate Independent Studies - Communication Sciences and Disorders

This literature review will examine 10 studies. The first section will discuss one study regarding common personality traits that practicing SLPs and SLP graduate students possess. The next section will review four studies about studying abroad. The final section will summarize four studies about the impact of mindset on life experiences and one study on how a growth mindset may potentially affect a study abroad experience.


Average Speech Directivity, Samuel D. Bellows, Claire M. Pincock, Jennifer K. Whiting, Timothy W. Leishman Nov 2019

Average Speech Directivity, Samuel D. Bellows, Claire M. Pincock, Jennifer K. Whiting, Timothy W. Leishman

Directivity

Speech directivity describes the angular dependence of acoustic radiation from a talker’s mouth and nostrils and diffraction about his or her body and chair (if seated). It is an essential physical aspect of communication affecting sounds and signals in acoustical environments, audio, and telecommunication systems. Because high-resolution, spherically comprehensive measurements of live, phonetically balanced speech have been unavailable in the past, the authors have undertaken research to produce and share such data for simulations of acoustical environments, optimizations of microphone placements, speech studies, and other applications. The measurements included three male and three female talkers who repeated phonetically balanced passages …


Outcomes In Children With Additional Disabilities Following Cochlear Implantation: A Systematic Review, Rebecca M. Tuchman Sep 2019

Outcomes In Children With Additional Disabilities Following Cochlear Implantation: A Systematic Review, Rebecca M. Tuchman

Dissertations, Theses, and Capstone Projects

Background: Thirty percent of children with hearing loss have an additional disability. These children may be difficult to test according to standard audiologic behavioral test protocols. Additionally, progress within this population may present differently than in children with no additional disability. Currently, no evidence-based protocol exists for assessing cochlear implant benefit and outcomes in this population.

Objective: The purpose of this investigation is to perform a systematic review on the outcomes of cochlear implantation in children with additional disabilities. Specifically, this study focused on areas of function assessed, outcome measures used, and evidence of benefit observed.

Methods: A comprehensive search …


Taste Manipulation And Swallowing Mechanics In Trauma-Related Sensory-Based Dysphagia, Angela M. Dietsch, H. Duncan Dorris, William Pearson, Katie E. Dietrich-Burns, Nancy Pearl Solomon Aug 2019

Taste Manipulation And Swallowing Mechanics In Trauma-Related Sensory-Based Dysphagia, Angela M. Dietsch, H. Duncan Dorris, William Pearson, Katie E. Dietrich-Burns, Nancy Pearl Solomon

Department of Special Education and Communication Disorders: Faculty Publications

Purpose: This study explored the effects of highconcentration taste manipulation trials on swallow function in persons with sensory-based dysphagia.

Method: Dysphagia researchers partnered with clinical providers to prospectively identify traumatically injured U.S. military service members (N = 18) with sensorybased dysphagia as evidenced by delayed initiation and/or decreased awareness of residue/penetration/ aspiration. Under videofluoroscopy, participants swallowed trials of 3 custom-mixed taste stimuli: unflavored (40% weight/volume [wt/vol] barium sulfate in distilled water), sour (2.7%wt/vol citric acid in 40% wt/vol barium suspension), and sweet–sour (1.11% wt/vol citric acid plus 8% wt/vol sucrose in 40% wt/vol barium suspension). Trials were analyzed and compared …


Motor-Induced Suppression Of The N100 Event-Related Potential During Motor Imagery Control Of A Speech Synthesizer Brain–Computer Interface, Jonathan S. Brumberg, Kevin M. Pitt Jul 2019

Motor-Induced Suppression Of The N100 Event-Related Potential During Motor Imagery Control Of A Speech Synthesizer Brain–Computer Interface, Jonathan S. Brumberg, Kevin M. Pitt

Department of Special Education and Communication Disorders: Faculty Publications

Purpose: Speech motor control relies on neural processes for generating sensory expectations using an efference copy mechanism to maintain accurate productions. The N100 auditory event-related potential (ERP) has been identified as a possible neural marker of the efference copy with a reduced amplitude during active listening while speaking when compared to passive listening. This study investigates N100 suppression while controlling a motor imagery speech synthesizer brain–computer interface (BCI) with instantaneous auditory feedback to determine whether similar mechanisms are used for monitoring BCI-based speech output that may both support BCI learning through existing speech motor networks and be used as a …


Involvement Of Adults Who Are Deaf Or Hard Of Hearing In Ehdi Programs, Elizabeth Shuler-Krause, Karl R. White Jun 2019

Involvement Of Adults Who Are Deaf Or Hard Of Hearing In Ehdi Programs, Elizabeth Shuler-Krause, Karl R. White

Journal of Early Hearing Detection and Intervention

Consistent with a position statement of the Joint Committee on Infant Hearing (JCIH, 2007), several key organizations and groups have supported involving deaf and hard of hearing (DHH) adults in Early Hearing Detection and Intervention (EHDI) systems, including providing families of children who are DHH with opportunities to interact with adults who are DHH. This article reviews the available data on the involvement of adults who are DHH in EHDI systems to determine the availability of opportunities for families who have children who are DHH to interact with adults who are DHH, how families feel about these experiences, and to …


Family Impact Of Pediatric Hearing Loss: Findings From Parent Interviews And A Parent Support Group, Kristen L. Haddad, Wendy W. Steuerwald, Lori Garland Jun 2019

Family Impact Of Pediatric Hearing Loss: Findings From Parent Interviews And A Parent Support Group, Kristen L. Haddad, Wendy W. Steuerwald, Lori Garland

Journal of Early Hearing Detection and Intervention

Parents experience numerous stressors tied to their child's diagnosis as deaf or hard of hearing (DHH). This study sought to inquire about the lived experiences of parents with children who are DHH to inform the types of supports that should be provided within an audiology care coordination system. Semi-structured phone interviews were conducted with parents of children under the age of five who are DHH and patients of the Division of Audiology at Cincinnati Children’s Hospital Medical Center (CCHMC). Interview findings informed focus group questions, which were facilitated in a parent support group with parents of children who are DHH …


A Method Paper For Earplug-Fitting Augmentative Procedures Tested In Groups Of More Experienced And Less Experienced Users Of Hearing Protection, Natalie Dixon, Antony Joseph May 2019

A Method Paper For Earplug-Fitting Augmentative Procedures Tested In Groups Of More Experienced And Less Experienced Users Of Hearing Protection, Natalie Dixon, Antony Joseph

AuD Capstone Projects - Communication Sciences and Disorders

Although a long history of research has led to extensive knowledge about hearing protection devices (HPDs), there has been limited research about procedures that provide aid and verification during HPD insertion, although several studies have reported about HPD training. No standard methods have been established for training of earplug use (Takahashi, 2011).

A review of the literature revealed a need for tools that might be used to improve user ability to properly insert HPDs consistently, even in the absence of training, because training is rarely provided in the workplace. The prevailing research question was "Does the use of simple fitting …


Relationships Between Ambient Noise Levels And Vocal Effort When Working As A Restaurant Bartender, Ashley Bautista May 2019

Relationships Between Ambient Noise Levels And Vocal Effort When Working As A Restaurant Bartender, Ashley Bautista

Ursidae: The Undergraduate Research Journal at the University of Northern Colorado

Workers in many different fields depend upon their voice for job performance. Vocal load, the way a voice is used and how much it is used, increases as a function of the total time speech is produced and the intensity (“loudness”) of the voice. Speakers tend to increase pitch, intensity, and duration of speech in the presence of noise, known as the Lombard Effect, which can lead to greater vocal fold stress and subsequent risk of vocal injury. In addition to increased risk of vocal injury, high levels of ambient noise might put workers at risk of auditory damage. …


The Effect Of Retrieval Practice On Vocabulary Learning For Children Who Are Deaf Or Hard Of Hearing, Casey Krauss Reimer May 2019

The Effect Of Retrieval Practice On Vocabulary Learning For Children Who Are Deaf Or Hard Of Hearing, Casey Krauss Reimer

Arts & Sciences Electronic Theses and Dissertations

The goal of the current study was to determine if students who are deaf or hard of hearing (d/hh) would learn more new vocabulary words through the use of retrieval practice than repeated exposure (repeated study). No studies to date have used this cognitive strategy—retrieval practice—with children who are d/hh. Previous studies have shown that children with hearing loss struggle with learning vocabulary words. This deficit can negatively affect language development, reading outcomes, and overall academic success. Few studies have investigated specific interventions to address the poor vocabulary development for children with hearing loss. The current study investigated retrieval practice …


The Feasibility Of Standardized Cognitive Assessments For Vestibular Patients, Brynn Morales May 2019

The Feasibility Of Standardized Cognitive Assessments For Vestibular Patients, Brynn Morales

Senior Honors Projects, 2010-2019

Vestibular dysfunction, or impairments in the inner ear and/or brain structures that process sensory information and help control balance, has a high correlation with cognitive deficits, or problems with mental processes. This relationship negatively affects daily activities and quality of life in persons that live with vestibular dysfunction. Though there is sufficient research proving the relationship, few studies have applied that information in ways to better help the population with vestibular dysfunction. The purpose of this study was to assess the feasibility of a cognitive assessment battery (a set of correlated assessments delivered in one session) tailored to measuring performance …


Cervical Vestibular-Evoked Myogenic Potentials (Cvemps): "Differentiation Of Inter-Neck Emg Symmetry Between Children And Adults", Ellen Jones May 2019

Cervical Vestibular-Evoked Myogenic Potentials (Cvemps): "Differentiation Of Inter-Neck Emg Symmetry Between Children And Adults", Ellen Jones

Senior Honors Projects, 2010-2019

A cervical Vestibular-Evoked Myogenic Potential (cVEMP) is one of the few objective vestibular diagnostic tests available for pediatric populations. This test evaluates the functionality of the saccule end organ through an inhibitory reflex on the sternocleidomastoid (SCM) muscle that inhibits the level of electromyographic (EMG) activity (Wiener-Vacher, 2013). Because the saccule response is measured as an inhibition of EMG in the SCM, it is imperative that the SCM have a tonic contraction prior to eliciting the response and that the contraction of the SCM is equal on the right and left sides. It is generally accepted that young, healthy adults …


The Test-Retest Reliability Of Binaural-Processing Tasks At Home Versus A Clinical Environment, Logan Grace Faust May 2019

The Test-Retest Reliability Of Binaural-Processing Tasks At Home Versus A Clinical Environment, Logan Grace Faust

Dissertations, 2014-2019

Objective: Investigate the reliability of a custom-designed, portable, stereo-hearing testing system (as in the Ganev, 2017, Au.D. dissertation) when subjects self-administer two different stereo-hearing tasks at home. Results obtained under known and supervised conditions at a university clinic or lab versus unknown conditions at the participants’ homes were compared. Intra-subject comparison, and inter-subject trends, discerned the reliability of patient setup and self-administration of the two tasks.
Design: Ten subjects were evenly split among two conditions: five subjects each setup and self-administered the tasks first at home and then received direction in the clinic, and five received direction and did the …


Music And Speech Perception In Children Using Sung Speech: Effects Of Neurocognitive Factors, Victoria A. André May 2019

Music And Speech Perception In Children Using Sung Speech: Effects Of Neurocognitive Factors, Victoria A. André

Dissertations, 2014-2019

The current study aimed to explore normal-hearing children's ability to utilize pitch and timbre cues and how these findings correlate with neurocognitive factors. Participants were recruited if they had English as their first language and no formal musical training or 3+ years of formal musical training. Twenty normal-hearing children, age 7.5-14.5 years (mean = 10.5; n=20) were recruited for the study. Nonverbal intelligence, receptive vocabulary, and auditory working memory were assessed using subtests of the Kaufman Brief Intelligence Test-2, Peabody Picture Vocabulary Test-4, and Comprehensive Test of Phonological Processing-2, respectively. Raw scores were used to analyze these neurocognitive abilities in …


Counseling For Patients With Hyperacusis, Mary Maraist May 2019

Counseling For Patients With Hyperacusis, Mary Maraist

Communication Sciences and Disorders: Student Scholarship & Creative Works

Hyperacusis is the phenomenon of experiencing moderately loud sounds as overly loud and/or intensely annoying. Hyperacusis can also cause fear or pain in response to sound. There is no one known cause of hyperacusis, and because of the variety of ways it presents itself, the approximate prevalence is difficult to determine. Despite the ambiguity of hyperacusis, the audiologist is an important part of diagnosing and educating clients with hyperacusis. During this project we aimed to discover the challenges individuals with hyperacusis face. These include anxiety, depression and avoidance behavior, and sometimes co-occurring tinnitus and hearing loss. Another aim was to …


The Effects Of Gesture On Early Language Production, Gabrielle Zeyl May 2019

The Effects Of Gesture On Early Language Production, Gabrielle Zeyl

Senior Honors Projects

Over the last decade, baby sign language (adapted signs for simple words like milk or mom) has become a trending parenting fad. Although significant research is still lacking on the subject, there is evidence suggesting that the use of early gestures is beneficial in promoting spoken language in typically developing children. Given developmental support for early gesture, this project aims to investigate the use of manual gestures to support speech sound production for a young child with speech and language delay. This project is two-fold. Part one included an extensive literature review of existing research on baby sign, gesture and …


Effect Of Consistent Singing On Maintenance Of Speech Intelligibility Following Lsvt®: A Retrospective Longitudinal Case Study, Rachel Ricca Beck May 2019

Effect Of Consistent Singing On Maintenance Of Speech Intelligibility Following Lsvt®: A Retrospective Longitudinal Case Study, Rachel Ricca Beck

Graduate Theses and Dissertations

Parkinson’s Disease is a common neurodegenerative disease affecting one’s ability to hone and refine volitional movement. Many with Parkinson’s report significant effects on voice and communication. Speech-language pathologists have long targeted the achievement of increased vocal volume through intensive voice therapy, with the most common program being Lee Silverman Voice Treatment® (LSVT®) (Ramig et al., 1994). While LSVT® is the most prominent type of voice therapy for individuals with Parkinson’s, other researchers have begun investigating therapeutic singing because of the similar functions it employs (e.g., increased breath support, utilization of entire vocal range).

The current project is a retrospective, longitudinal …


Effects Of Primary And Secondary Cigarette Smoke On Auditory Function: A Systematic Review, Hilary Mcmanus May 2019

Effects Of Primary And Secondary Cigarette Smoke On Auditory Function: A Systematic Review, Hilary Mcmanus

Dissertations, Theses, and Capstone Projects

Objective: The goal of this paper was to systematically review literature in order to investigate the effects of active and passive cigarette smoke on auditory function when assessing outcome measures including pure tone audiometry, otoacoustic emissions, high-frequency audiometry, and auditory evoked potentials.

Methods: A comprehensive search using the Medline Complete database was conducted to identify relevant studies published after 2005. Inclusion criteria included the use of pure tone audiometry, high-frequency audiometry, otoacoustic emissions, and/or auditory evoked potentials to examine the effect of primary or secondary cigarette smoke. Studies involving noise exposure or other confounding factors were excluded.

Results: A total …


Investigating Predictive Relationships Between Speech-Language Pathology Graduate Students' Sense Of Classroom Community, Perceived Learning, And Perceived Anxiety., Emily B. Schantz May 2019

Investigating Predictive Relationships Between Speech-Language Pathology Graduate Students' Sense Of Classroom Community, Perceived Learning, And Perceived Anxiety., Emily B. Schantz

Electronic Theses and Dissertations

Mental health is an all-encompassing term that focuses on a person’s ability to achieve work-life balance inclusive of positive mental health and mental ill-health. Current trends suggest an overall increase in mental ill-health for undergraduate and graduate students. McMillan and Chavis’ sense of community theory provided the theoretical framework for this study. This study aimed to examine whether speech-language pathology graduate students’ sense of classroom community and perceived learning predict anxiety levels while controlling for demographic variables. Three-hundred-sixteen master’s level speech-language pathology students completed an online survey containing the Generalized Anxiety Disorder Questionnaire, Perceived Learning Scale, and Classroom Community Scale. …


Validation Of A Scale To Measure Phonological And Morphological Knowledge And Skill Of Speech-Language Pathologists And Elementary Teachers, Susan S. Perry May 2019

Validation Of A Scale To Measure Phonological And Morphological Knowledge And Skill Of Speech-Language Pathologists And Elementary Teachers, Susan S. Perry

Dissertations

Phonological and morphological skills are crucial to the process of reading. Speech-language pathologists (SLPs) have received advanced trained in these basic foundations of language and could be an untapped resource in our school systems for teaching beginning reading skills. The purposes of this research were to examine SLPs’ and general education elementary (K-6) teachers’ attitudes toward SLPs taking part in reading instruction, to compare the differences in phonological and morphological knowledge and skill among SLPs and teachers, and to assess the performance of the Revised Basic Language Constructs Surveywhen administered to SLPs and teachers.

Results indicated that, although fewer …


Screening For Hearing Loss: Physician Attitudes And Practice, Theresa N. Vitale May 2019

Screening For Hearing Loss: Physician Attitudes And Practice, Theresa N. Vitale

Dissertations, Theses, and Capstone Projects

Age related hearing loss (ARHL) is considered a public health hazard in large part due to the negative health outcomes with which it is associated, such as, cognitive decline, increased risk of falling, social isolation and depression. Despite the health-related costs of ARHL, physician’s rarely screen older adults for ARHL. Some of the reasons previously cited include a lack of time and resources in medical offices, a lack of reimbursement for such measures, or lack of knowledge of risk factors associated with hearing loss. The latter is problematic as improved communication among physicians and their patients is an important correlate …


“Evaluating Knowledge And Perspectives Of Behavior Analytic Language Strategies In The Clinical Practice Of Speech-Language Pathology”, Mackenzie Sturman Apr 2019

“Evaluating Knowledge And Perspectives Of Behavior Analytic Language Strategies In The Clinical Practice Of Speech-Language Pathology”, Mackenzie Sturman

Honors Theses

Research shows that principles of applied behavior analysis (ABA) may be beneficial to language acquisition. Speech-language pathologists (SLPs) have the responsibility of assessment, diagnosis, and treatment for individuals with various speech and language impairments, and work directly with language instruction. However, there is limited knowledge of the degree to which SLPs use concepts of behavior analytic language interventions in clinical practice for individuals of varying language and communication disorders. This study investigated the extent to which practicing SLPs use language strategies from ABA in their clinical practice. A qualitative approach was utilized by conducting individual semi-structured interviews with four practicing …


Effects Of Stuttering Frequency, Speaking Rate And Treatment On Speech Naturalness In Adults Who Stutter, Emily Hausman Apr 2019

Effects Of Stuttering Frequency, Speaking Rate And Treatment On Speech Naturalness In Adults Who Stutter, Emily Hausman

Honors Theses

Purpose: Individuals who stutter can often exhibit speech patterns that sound unnatural compared to individuals who do not stutter. Unnaturalness can be due to several underlying factors including the presence of stuttering itself and the unintended consequences of treatment approaches that alter speech motor patterns. Understanding factors that impact speech naturalness within the stuttering population can help improve the clinical management of the disorder. The current study investigates the relationship between pause duration, speech rate and stuttering frequency, and listener ratings of speech naturalness in a group of adults who stutter (AWS) before and after participation in a stuttering treatment …


Exploring The Experiences Of Communication Partners Of People With Parkinson's Disease: A Qualitative Study, Jacqueline Bell Apr 2019

Exploring The Experiences Of Communication Partners Of People With Parkinson's Disease: A Qualitative Study, Jacqueline Bell

Dissertations, Theses, and Projects

The purpose of this phenomenological qualitative study was to explore interactions between persons with Parkinson's disease (PD) and their communication partners. People with PD experience difficulties that can have a profound effect on their ability to communicate. This qualitative study explored the thoughts and feelings of primary communication partners of people with PD. The primary communication partners were interviewed using open-ended questions. The seven participants identified and detailed how declines in communication due to PD have resulted in changes in daily life, including; social participation, daily tasks, and psychosocial well-being. Commonalities that communication partners experienced will aid speech-language pathologists to …


Exploring The Cochlear Implant Controversy: The Role Of And Experience With Deaf Culture For Parents Of Pediatric Cochlear Implant Users, Tia Kilgore Apr 2019

Exploring The Cochlear Implant Controversy: The Role Of And Experience With Deaf Culture For Parents Of Pediatric Cochlear Implant Users, Tia Kilgore

Ursidae: The Undergraduate Research Journal at the University of Northern Colorado

This project examined the relationships between pediatric cochlear implantation and Deaf Culture. More specifically, this research investigated how/if parents are educated about or exposed to Deaf Culture during the cochlear implant candidacy evaluation process, and what type of interactions (if any) the child or caregiver had with members of the Deaf community after the child received a cochlear implant. A short survey was distributed to caregivers of pediatric cochlear implantees. While the responses were varied, a majority of caregivers responded that Deaf culture was not an active piece of the CI candidacy process. Additionally, interactions with members of the Deaf …


Can Your Dog Hear You? Perceptions About Canine Hearing Loss And Noise Exposure, Nakita Jarmon Apr 2019

Can Your Dog Hear You? Perceptions About Canine Hearing Loss And Noise Exposure, Nakita Jarmon

Ursidae: The Undergraduate Research Journal at the University of Northern Colorado

This research study was designed to explore dog owners’ views on how often they expose their dogs to loud noises and whether or not the owners believe noise exposure affects their dogs’ hearing. Many humans are not aware that dogs, too, can suffer from hearing loss. To determine dog owners’ perceptions of the amount of noise exposure their dogs face and if their hearing is affected as a result, I created a survey for dog owners in Colorado. The results indicated that many dog owners do not believe they expose their dogs to loud noises. A majority of individuals were …


Speech-Language Pathologist Preferences For Treatment Types For Childhood Apraxia Of Speech, Meeghan Hoose Apr 2019

Speech-Language Pathologist Preferences For Treatment Types For Childhood Apraxia Of Speech, Meeghan Hoose

Honors Theses

Childhood Apraxia of Speech (CAS), also known as developmental apraxia is, “a motor speech disorder that makes it hard for children to speak” (American Speech-Language-Hearing Association). While the child knows what he/she wants to say, the signals going from the brain to the mouth are not delivered correctly, resulting in the mouth not moving appropriately to produce the desired sounds. There are several methods used by speech-language pathologists to treat CAS including moto-programming, a linguistic approach, a combination of motor-programming and linguistic methods, sensory cuing and rhythmic approaches. Through surveying local practicing school speech-language pathologists, I will learn their preferred …


Picture Cued And Speech Production Cued Approaches For Speech Sound Learning, Michelyve C. Petit Apr 2019

Picture Cued And Speech Production Cued Approaches For Speech Sound Learning, Michelyve C. Petit

LSU Master's Theses

This study examined the use of speech production cued cards, MorphoPhonic faces (MPF), and plain picture (PP) cards when seeking to remediate speech sound errors, specifically sounds / ɹ / and / s / in the word initial position. Fourteen children were provided articulation therapy at their public school using both stimulus types across four weeks. Each week, the total number of correct productions of target phoneme / s / and /ɹ/ were recorded and averaged. These results were used to graphically showcase trends in their performance with both stimulus types. The results demonstrated that MPF cards were advantageous for …


Acoustic Characteristics Of Vowels Produced By Young Children From The New Orleans Area, Rebecca E. Dorsa Apr 2019

Acoustic Characteristics Of Vowels Produced By Young Children From The New Orleans Area, Rebecca E. Dorsa

LSU Master's Theses

Understanding dialects and their effects on speech and language is integral to the field of speech-language pathology, as dialectal differences could potentially be misdiagnosed as speech or language disorders if these factors are not well-considered. The number and organization of the vowel system of one regional dialect of American English differs from those of another regional dialects. Therefore, understanding the effect of dialect on vowel productions in children can aid in the accurate evaluation of children from various dialectal backgrounds. The aims of the proposed study were to 1) determine the age at which young children develop acoustic markers of …