Digital Commons Network^™

The Directional Effect Of Target Position On Spatial Selective Auditory Attention, Heesung Park

Dissertations, 2020-current

Spatial selective auditory attention plays a crucial role in listening in a mixture of competing speech sounds. Previous neuroimaging studies have reported alpha band neural activity modulated by auditory attention, along with the alpha lateralization corresponding to attentional focus. A greater cortical representation of the attended speech envelope compared to the ignored speech envelope was also found, a phenomenon known as 'neural speech tracking’. However, little is known about the neural activities when attentional focus is directed on speech sounds from behind the listener, even though understanding speech from behind is a common and essential aspect of daily life. The …

Age-Related Decline In Neural Synchrony And The Ffr, Haley Szabo

Dissertations, 2020-current

It is a known phenomenon that speech understanding in background noise declines with advancing age. Although there is ample evidence of behavioral measures declining with age, there is less physiologic evidence. This study hypothesizes that the FFR will be degraded with advancing age, consistent with poorer phase locking. This is hypothesized to be present even in people with audiograms within normal limits. A second hypothesis is that middle-aged adults will have degraded neural representation as frequency increases, compared to a younger normal hearing group which will have better high frequency neural representation than the middle-aged group. Subjects were divided into …

Reality Of Counseling In Pediatric Audiology Clinical Practice, Lara Leggio

Dissertations, 2020-current

The overwhelming nature of hearing loss identification often causes families to experience grief and confusion. Children as young as nine months old with severe hearing loss have the option to undergo cochlear implantation (CI) surgery with the hopes of restoring normal hearing. Pediatric audiologists accompany families through the identification of hearing loss and the learning process that coincides with this surgery. Despite knowledge that parents of children with communication disabilities will experience a sense of loss and have moderate to severe cyclic emotional reactions, little is known about how audiologists manage the emotional needs of families, if they feel prepared …

Impact Of Diabetes Mellitus On Vestibular Function: A Scoping Review, Ellen M. Jones

Dissertations, 2020-current

Diabetes mellitus (DM) encompasses a group of metabolic diseases that result in high blood sugar (i.e., hyperglycemia). By 2030, it is anticipated that 578 million adults worldwide will have DM, with this number growing at a faster rate in developed areas of the world.^[27] If left uncontrolled, DM can cause considerable damage to several areas of the body, including the heart, kidneys, nerves, and ears. When focusing exclusively on the ears, there has been markedly less research on the vestibular system when compared to the auditory system, even though DM is a known risk factor for falling. The purpose …

Magnitude Estimates Of Angular Motion: Perception Of Speed And Spatial Orientation Across Visual And Vestibular Modalities, Erin Hernon

Dissertations, 2020-current

Both the vestibular system and optokinetic system generate conjugate eye movements in response to either movement of the head or movement of the visual surround. Both systems help to maintain gaze stability. While the VOR is most sensitive to input frequencies above .2 Hz, the optokinetic system helps maintain gaze stability at lower frequencies. Previous research on perceptual thresholds across the two sensory modalities shows that there are frequency-dependent differences between vestibular and visual perception. The purpose of this study is to extend previous vestibular psychophysics work by 1) comparing magnitude estimates from vestibular stimulation to visual stimulation across multiple …

Assessing Word Recognition In Infants With A History Of Chronic Otitis Media, Sarah Wright

Dissertations, 2020-current

Otitis media (OM) is a common ear-related disorder diagnosed in children that can cause a temporary conductive hearing loss. The fluctuating hearing loss may alter auditory processing which may interfere with language development while impacting quality of life for infants and their caregivers (Homøe et al., 2019). In several languages, eleven-month-old infants have shown a preference for familiar words over unfamiliar words using the head-turn preference paradigm. This study examines the effect of chronic OM on the preference for familiar or unfamiliar words in eleven-month-old infants. Fourteen eleven-month-old infants (mean age 344 days) with three or more diagnosed ear infections …

Role Of Emg Monitoring On Cvemp Testing In Preschool Age Children, Brenna Murray

Dissertations, 2020-current

While cervical vestibular evoked myogenic potential (cVEMP) testing has largely been studied and practiced on the adult population, less is known about the best practices for performing cVEMPs on a pediatric population, especially in young children under the age of 5 years. Further, very young children (i.e., 2-3 years) often prefer to sit with their caregiver during the testing, yet there is very little data on how much electromyographic (EMG) activity a child generates if in a seated position as opposed to a supine position. The purpose of this study was to assess the role of EMG on cVEMP recordings …

A Survey Of Cochlear Implant Clinical Protocols In India, Ariana Morris

Dissertations, 2020-current

The most recent data published in December 2019 records that approximately 736,900 registered cochlear implantation devices have been received since their approval in the 1980s. While 183,100 of these devices belong to U.S. Citizens, the large majority of cochlear implant recipients live in other countries (U.S. Department of Health and Human Services, 2016). While a lack of standardized practices exists in relation to audiologic care and management of cochlear implant devices and patients, Browning et al. (2020) attempts to assess and analyze common practices amongst audiologists practicing within the United States of America. This survey uses a modified questionnaire based …

The Relationship Between Quality Of Life Outcomes And Social Hearing For Cochlear Implant Recipients Using The Nciq And Pipsl, Bonnie A. Purtill

Dissertations, 2020-current

Unmanaged hearing loss can have profound cognitive, social, and emotional impacts on a person’s life. Cochlear implants improve functional skills such as auditory detection and speech discrimination, and have also been shown to improve quality of life. Health related quality of life (HRQoL) measures are a great tool to assess mental, physical, and social changes after cochlear implantation. While previous research has established improvement in HRQoL after cochlear implantation, there remains a lack of research evaluating long-term effects of cochlear implants for post-lingually and bilaterally deafened adults. Using a disease specific HRQoL questionnaire—Nijmegen Cochlear Implant Questionnaire (NCIQ) and a social …

The Relationship Between The Vestibular Ocular Reflex And Perception In Young Healthy Adults, Susanne Nelson

Dissertations, 2020-current

Vestibular impairments are often identified through measures of vestibular reflexes such as the vestibulo-ocular reflex (VOR). However, in clinical practice measures of the VOR do not always correlate with the patient’s reported symptoms. In contrast to physiologic measures like the VOR, psychophysical methods can be used to assess a person’s perception of movement. Previous psychophysics research shows that perceptual thresholds of angular motion do not correlate with VOR measures, but this has not been assessed at suprathreshold levels. The purpose of this study was to assess whether vestibular reflexive responses (i.e., VOR) were correlated to the patient’s perception of movement …

Amplitude-Modulated Cvemp (Amcvemps) Versus Transient Cvemp Response Properties: Possible Implications, Andrew Thorne

Dissertations, 2020-current

Cervical vestibular evoked myogenic potentials (cVEMPs) elicited by steady-state amplitude-modulated (AM) tones yield different information than conventional cVEMPs elicited by transient tonebursts, such as signal-to-noise ratio (SNR) and phase coherence (PC). This study systematically examined the effects of tonic EMG activation on AMcVEMP response properties versus conventional transient cVEMPs. Thirty five young, healthy adults (ages 19–23) with normal audiograms and no known vestibular lesions participated in this study. AMcVEMPs were elicited with bone-conducted tones with a carrier frequency of 500 Hz and an amplitude modulation frequency of 37 Hz, and transient cVEMPs were elicited by 4-0-4 Blackman-gated 500 Hz tonebursts …

Temporal Modulation Transfer Functions Of Amplitude-Modulated Cervical Vestibular Evoked Myogenic Potentials In Young Adults, Kerri Lawlor

Dissertations, 2020-current

Cervical vestibular evoked myogenic potentials (cVEMPs) are widely used to evaluate saccular function in clinical and research applications. Typically, transient tonebursts are used to elicit cVEMPs. In this study, we used bone-conducted amplitude-modulated (AM) tones to elicit AMcVEMPs. This new approach allows the examination of phase-locked vestibular responses across a range of modulation frequencies. Currently, cVEMP temporal modulation transfer functions (TMTFs) are not well defined. The purposes of the present study were 1) to characterize the AMcVEMP TMTF in young, healthy individuals, 2) to compare AMcVEMP TMTFs across different analysis approaches, and 3) to determine the upper frequency limit of …

Remote-Frequency Masking And Speech Perception In Adults, Taylor L. Arbogast

Dissertations, 2020-current

The primary purpose of this study is threefold: to use SRT measurements to examine the effect of various remote-frequency, narrowband maskers on adult’s perception of narrowband speech, to compare the performance between low and high band speech stimuli, and to evaluate the combination of these approaches by examining the correlation between the masking effect observed with speech and pure tone stimuli. Twelve subjects aged 22-34, with hearing thresholds no worse than 15 dB HL for frequencies 500-8000 Hz, participated in two listening tasks. In the speech perception task, coordinate response measure (CRM) sentences and their maskers were separately filtered into …

Quasi-Experimental Design And Outcomes Of A Graduate Clinician And Caregiver-Infant Coaching Intervention In A University Speech-Language Pathology Program, Shiree C. Harbick

Dissertations, 2020-current

Infants are born ready to learn language as one of their most critical developmental tasks, yet infants subject to environmental risk factors related to poverty and low maternal education have been shown to lag behind their peers in language development as early as 8 months of age. Research also indicates the quality of an infant’s language environment can significantly diminish the effects of these risk factors. This quasi-experimental clinical research study explored the effects of a preventive caregiver-infant coaching intervention delivered by graduate student clinicians in a university speech-language pathology program.

Developed based on a systematic review of preventive programs …

Objective Detection Of Vestibular Evoked Myogenic Potentials, Daniel J. Romero

Dissertations, 2020-current

Cervical and ocular vestibular evoked myogenic potentials (cVEMPs and oVEMPs, respectfully) are considered objective tests of vestibular function measured using surface electromyography (EMG). In addition, VEMPs are visually detected by an examiner, often requiring a high level of stimulation to the ear to easily visualize a waveform plotted across time. However, a high level of stimulation, like those used during routine VEMP testing, is problematic since it has been shown to be unsafe in children when compared to adults. Visual interpretation can also vary between examiners in cases of reduced vestibular function or when the level of required muscle contraction …

The Influence Of Side-Lying Position On Oropharyngeal Swallow Function In At-Risk Infants: An Exploratory Study, Julian White

Dissertations, 2020-current

Speech-Language Pathologists (SLP) are the primary healthcare providers responsible for the evaluation and treatment of infant feeding and swallowing disorders. At-risk infants, such as those born prematurely or with certain medical conditions, are more prone to swallowing impairments (i.e., dysphagia). Dysphagia in at-risk infants can have severe consequences such as chronic respiratory symptoms, pneumonia, progressive lung disease, undernutrition, and death. Therefore, it is important to have methods of examining an infant’s swallow functioning that are both safe and accurate. A leading method of evaluating infant swallowing is the Modified Barium Swallow Study (MBS). The works contained within this dissertation document …

Influence Of Musicianship, Socioeconomic Status, And Working Memory On Children’S Speech Recognition In Noise, Victoria H. Whitney

Dissertations, 2020-current

Superior speech recognition in the presence of background noise has been repeatedly observed among musicians. For children whose auditory skills are immature or delayed, improved speech-in-noise understanding via musical training could have significant clinical implications. The present study considered the impact socioeconomic status (SES) and working memory have on musicians’ greater skill during such tasks in order to better understand the mediating factors of the proposed musician advantage, as well as provide additional evidence of its existence. Participants were recruited by the Laboratory for Auditory Perception in Children and Adults at James Madison University. Ultimately, twenty-five normal-hearing children between the …

Language Sampling With Older School-Aged Children: Examination Of Analyses And Sampling Contexts, Michelle Lenhart

Dissertations, 2020-current

Purpose: Conversation, narrative, and expository language sampling contexts are recommended for school-aged children (Pezold et al., 2020), and multiple ways to analyze these samples have been promoted in the clinical literature. This dissertation addressed two gaps in the literature related to analyses and sampling contexts. The purpose of study one was to examine differences in two commonly-used language sample analysis methods, Sampling Utterances Grammatical Analysis Revised (SUGAR) and Systematic Analysis of Language Transcripts (SALT). The purpose of study two was to examine the presence of age-related changes in conversation, narrative, and expository contexts for older school-aged children.

Method: Conversational, narrative, …

Dual Task Study Of Cognitive And Postural Interference: Development Of A Methodology For Use In Vestibular Disorders, Valerie Beacham

Dissertations, 2020-current

For patients with vestibular impairments, postural stability alone can be demanding but is more taxing when an individual’s attention is focused on both maintaining balance and a secondary/cognitive task simultaneously. Thus, dual task paradigms where balance must be maintained while performing postural and cognitive tasks concurrently provides an assessment on one’s attentional resources available for balance. Previous studies show varying levels of dual task effects in patients with vestibular loss with little consistency between studies regarding choice of balance and cognitive tasks. The purpose of this study was to assess the feasibility of a dual task paradigm using portable instrumentation …

Assessing Word Recognition Through Head Turn Preference In Infants With Chronic Otitis Media, Allison E. Schmidt

Dissertations, 2020-current

Previous studies across a variety of different languages have shown that eleven-month-olds tested via the head-turn preference paradigm show a preference for familiar words over unfamiliar words, as demonstrated by longer look times. This study examined the effect of chronic otitis media on the preference for familiar over unfamiliar words. Nine eleven-month-old children (mean age 342 days, SD = 9.61) with chronic ear infections, defined as three or more diagnoses before the test date, were tested using wordlists adapted from a study performed by Vihman et al. (2004). Children with a history of chronic otitis media did not show a …

Effect Of A Small Change In Auricle Projection On Sound Localization, Elizabeth N. Surface

Dissertations, 2020-current

Pinnae assist in sound localization, and changes in auricle shape, position, or projection can theoretically alter the perceived position of a sound. The minimal displacement required to affect perceived sound location is undefined. This study quantified the error in horizontal sound localization when auricle projection is slightly decreased. The study was conducted at two sites by different experimenters, using different (though similar) systems, over a year apart. There were 21 normal-hearing participants: 11 at the University of Virginia (UVA) and 10 at James Madison University (JMU). Both UVA and JMU protocols involved a normal listening condition and a second condition …

The Examination Of Morpho-Syntactic Production In Bahamian Children Exposed To Bahamian Creole English And English, Danielle Moss

Dissertations, 2020-current

Purpose. Information on the morpho-syntax development of children who speak varieties of Bahamian English, such as Bahamian Creole English (BCE), remains understudied. Therefore, speech-language pathologists (SLPs) assessing the expressive language of children who speak BCE encounter challenges in making clinical judgments of language difference, developmental errors, and language disorder because they are unable to judge the morpho-syntactic features of this creole to the rules of another variety of Bahamian English, standard English (SE¹), as both varieties, BCE and SE, are independently rule-governed. This dissertation study investigated the morpho-syntax of typically developing four and six-year-old Bahamian children who speak …

Measuring Listening Effort Using Physiological, Behavioral And Subjective Methods In Normal Hearing Subjects: Effect Of Signal To Noise Ratio And Presentation Level, Lakshmi Magudilu Srishyla Kumar

Dissertations, 2020-current

The main objective of the study is to compare the effectiveness of pupillometry, working memory and subjective rating scale —the physiological, behavioral, and subjective measures of listening effort— at different signal to noise ratios (SNR) and presentation levels: when administered together. Eleven young normal hearing individuals with mean age of 21.7 years (SD=1.9 years) participated in the study. The HINT sentences were used for speech perception in noise task. The listening effort was quantified using peak pupil dilation, working memory, working memory difference, subjective rating of listening and recall effort. The rating of perceived performance, frustration level and …

Effects Of Age And Middle Ear Resonance On The Frequency Tuning Of The Cvemp, Paris M. Atabek

Dissertations, 2020-current

Objective: The purpose of this study was to assess age-related changes in the frequency tuning of the cervical vestibular evoked myogenic potential (cVEMP) and determine the optimal air conduction tone-burst stimulus frequency to elicit a cVEMP in the young, middle age, and older adult populations. Additionally, we performed wideband acoustic immittance measures to better delineate whether observed changes in frequency tuning properties of the cVEMP across the lifespan emanate from changes in the middle ear transfer function or from the otolith end organs.

Design: A cross-sectional study design included 98 healthy participants divided into 3 age groups of …

Speech Understanding And Listening Effort In Noise With A New Speech Processing Algorithm, Abigail E. Compton

Dissertations, 2020-current

This study examined the effect of a new speech processing strategy (SpeechZone2) in a commercially available hearing aid on speech understanding in noise and self-reported listening effort. Seven adult, experienced hearing aid users (2 males, 5 females; mean age = 64.6 years) with mild to severe, sloping sensorineural hearing loss participated in this study. Binaural Unitron Flex receiver in the ear style hearing aids with closed domes were used to provide the manufacturer prescribed amplification for each participant. The hearing aids were programmed with two separate memories: 1) omnidirectional microphone without SpeecZone2 processing, and 2) adaptive directionality with SpeechZone2 processing. …

The Impact Of Hair Covering Hearing Aid Microphones On Directional Performance, Sara F. Wagner

Dissertations, 2020-current

This study examined the effect of hair covering on hearing aid directional microphone performance. Nine adult, experienced hearing aid users (3 males, 6 females; mean age = 64.6 years) with mild to severe, sloping symmetrical sensorineural hearing loss were included in this study. Binaural Oticon Opn 1 receiver-in-the-ear hearing aids with closed domes were used to provide the recommended amplification for each participant. Speech Reception Threshold (dB SNR required for 50% speech understanding) was measured in all combinations of directional microphone (on/off) and hair covering (with/without) resulting in a total of four conditions. Results showed that directional microphones significantly improved …

Induction Of Nocebo Effects By Verbal Suggestions During The Caloric Test, Abbey Weist

Dissertations, 2020-current

The caloric test is the most frequently performed vestibular diagnostic test and is considered the “gold-standard” for the assessment of the peripheral vestibular system. Using a warm or cool stimulus, the caloric test alters the temperature gradient in the vestibular system resulting in nausea and dizziness. The nocebo effect is a phenomenon that can occur when negative expectations result in negative effects. No study has examined whether expectations of nausea and dizziness during the caloric test enhance the experience of unwanted symptoms. The purpose of this investigation was to determine whether a nocebo response can be elicited during the caloric …

Music And Speech Perception In Pre-Lingually Deafened Young Listeners With Cochlear Implants: A Preliminary Study Using Sung Speech, Harley J. Wheeler

Dissertations, 2020-current

Timbre and pitch cues, though definitionally and physically distinct characteristics of sound, are attributes of all sound signals. A body of literature has shown that alteration of one characteristic can influence the perception of the other; e.g., speech spoken with an atypical contour of pitch can influence a listener's accuracy in identifying the words spoken; conversely, whether a melodic contour is presented via a MIDI piano representation or as sung speech can influence the accuracy of identification of the pitches' contour. Trends for these interactions have been documented for normal hearing children and adults, as well as postlingually deafened adult …

Envelope-Following Response Amplitude And Cochlear Traveling Wave Delay, Julia E. Dawson

Dissertations, 2020-current

Potential clinical roles of the envelope following response (EFR), such as diagnostic testing and amplification verification, are promising. Despite its potential, variability in response amplitude due to various stimulus characteristics is not yet fully understood. The purpose of this study was to evaluate the effects of cochlear traveling wave delay on EFR amplitude. EFRs were recorded on young, normal hearing individuals using amplitude-modulated tones to represent first (F1) and second formants (F2) of vowel stimuli. EFR stimuli were created with a fixed fundamental frequency and a fixed formant carrier frequency. Stimulus conditions employed a dynamic frequency approach by sweeping the …