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Dissertations / Theses on the topic 'Hearing-aids'

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Published: 4 June 2021

Last updated: 31 July 2024

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1

Henry, James Allen. "A comparison of the expressive speech of profoundly hearing-impaired children : "hearing aids on" versus "hearing aids off"." PDXScholar, 1987. https://pdxscholar.library.pdx.edu/open_access_etds/3714.

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This investigation was conducted to determine whether the removal of hearing aids from these children for eighteen hours (+ 1/2 hour and including sleep time) would result in reduced speech intelligibility as perceived by a panel of listening judges who were unfamiliar with the speech of the deaf.

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2

Luo, Zhengwei. "Beamforming for binaural hearing aids." Thesis, University of Ottawa (Canada), 2009. http://hdl.handle.net/10393/28170.

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Binaural hearing aids making use of a wireless link are becoming a trend in hearing-aids design. However, it is still not clear how much gain can be obtained in complex real-life acoustic environments when using binaural hearing aids compared to monaural ones, and whether binaural hearing aids are worth the additional effort and complexity. This thesis aims to provide some answers to this question. In particular, it will compare the performance of different microphone array configurations, study the effects of using different head models for fixed beamforming design, assess the effect of head model mismatch and direction of arrival information mismatch, investigate methods to preserve the binaural cues, evaluate combinations of fixed binaural beamforming followed by other noise reduction algorithms, and assess the performance of the different algorithms using both classical beamforming metrics and objective measures related to speech quality and intelligibility.

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3

Johnson, Earl E. "Listening with Normal Hearing, Hearing Impairment, and Hearing Aids: An Audiologic Perspective." Digital Commons @ East Tennessee State University, 2011. https://dc.etsu.edu/etsu-works/1712.

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4

Cheng, Chi-man. "Over-the-counter hearing aids : electroacoustic characteristics and possible target client groups /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19859612.

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5

Madsen, Sara Miay Kim. "Effects of hearing loss and hearing aids on music perception." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709106.

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6

Go, Nhicole Ang. "The international outcome inventory for hearing aids : a translation into Filipino with normative data." Thesis, Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37991759.

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7

Lamarche, Luc. "Adaptive environmental classification system for hearing aids." Thesis, University of Ottawa (Canada), 2008. http://hdl.handle.net/10393/27597.

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This thesis develops an adaptive environmental classification system for hearing aids. Two types of classifiers, minimum distance and Bayesian, are modified to include an adaptive layer that allows the classes to split or merge based on changes in the environment. In order to test the adaptability to the environmental change, both systems were first trained using two classes: Speech and Noise, followed by a testing period where, in addition to Speech and Noise, samples from a third class Music were introduced. Both systems were successful in detecting the presence of the new class Music and estimated its parameters obtaining an accuracy that is as high as the accuracy obtained through a non-adaptive supervised learning. In addition, the accuracy for the merging algorithm in both systems also met that of a non-adaptive system. In comparing the two systems, the adaptive Bayesian classification system resulted in a higher accuracy in classifying the environment into the three classes: Speech, Noise, and Music, following the adaptation process.

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8

Zhou, Lihong. "Blind source separation systems for hearing aids." Thesis, University of Ottawa (Canada), 2010. http://hdl.handle.net/10393/28395.

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For many real-life situations, there is more than one speaker at a given time and people need to concentrate on a target sound signal to extract it. This process happens naturally for people with a normal hearing ability, but it is very difficult for hearing impaired persons. In this thesis, we present a system for enhancing the quality of the signal produced by a hearing aid. The proposed system combines spatial information with blind source separation (BSS) to extract the target signal. Results show that the proposed system can locate a target signal in different environments, with a good learning ability. The problem of locating and extracting a target source signal is first investigated. By applying a time-frequency masking method, it is then shown that the performance can be improved. Finally, the problem of underdetermined BSS is investigated and solved by combining a MVDR beamformer with a determined BSS system.

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9

Priwin, Claudia. "Bone anchored hearing aids (BAHAs) in children /." Stockholm, 2006. http://diss.kib.ki.se/2006/91-7140-757-X/.

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10

Hostler, Mary. "Children's hearing aids : measuring real-world outcomes." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496758.

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The published literature about measuring children's hearing aid outcomes in real-world contexts is limited, compared with that relating to adults. This research investigates two key issues: the validity of the data obtained when using a questionnaire and the extent of aqreement between child and adult proxy respondents. The research used a modified version of the Glasgow Hearing Aid Benefit Profile (GHABP) which was administered to 49 deaf children aged 11-13 years and their parents and Teachers of the Deaf (ToDs) from the Greater Manchester area. Audiological and demographic data were obtained for each child, including the aided and unaided Speech Intelligibility Index and scores on the Ling six sound test. A feature of the research is the use of both quantitative and qualitative methods. The research paradigm is post-positivist, i.e. it is postulated that the questionnaire data are, at best, only approximations to the reality of the children's experience with hearing aids. The quantitative data were explored by several statistical methods, including Generalised Linear Models and Rasch Rating Scale models: the latter are used here for the first time In audiology. The issue of proxy reporting was explored quantitatively by means of Psychometric Profile Analysis and other measures developed in the present research. The qualitative data were investigated by Interpretative Phenomenological Analysis.

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11

Hasler, Ian Daniel. "Circuits and systems for intelligent hearing aids." Thesis, University of Liverpool, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507170.

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12

Shusina, Ngwa Abinwi. "Unbiased adaptive feedback cancellation in hearing aids." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274703.

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13

Hayes, Joanna Louise. "Parametric adaptive feedback cancellation in hearing aids." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396758.

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14

Greenberg, Julie Elise. "Improved design of microphone-array hearing aids." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/11631.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Whitaker College of Health Sciences and Technology, 1994.
Includes bibliographical references (p. 197-204).
by Julie Elise Greenberg.
Ph.D.

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15

Johnson, Earl E. "Considerations for Programming Hearing Aids for Children." Digital Commons @ East Tennessee State University, 2014. https://dc.etsu.edu/etsu-works/1745.

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16

Johnson, Earl E. "OTC Hearing Aids: Balancing Safety and Accessibility." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etsu-works/1975.

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Excerpt: There has been a recent push for more electronic sound amplifiers to provide affordable and accessible options that meet the needs of a large swath of people with hearing loss, particularly aging adults.

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17

Köbler, Susanne. "Bilateral hearing aids for bilaterally hearing-impaired persons - always the best choice? /." Stockholm, 2007. http://diss.kib.ki.se/2007/978-91-7357-067-1/.

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18

Eager, Katrise Mary. "Rehabilitation of unilateral profound sensorineural hearing loss with a bone anchored hearing aid." University of Western Australia. School of Surgery, 2010. http://theses.library.uwa.edu.au/adt-WU2010.0061.

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The long-term outcomes of subjects fitted with a bone anchored hearing aid (BAHA) for a unilateral profound sensorineural hearing loss (UPSHL) are still evolving. Previous studies have focused on the comparison between shortterm outcomes obtained with hard-wired contralateral routing of signal (CROS) hearing aids and those obtained with BAHA devices. Published results on subjects who have worn their BAHA devices for UPSHL for more than twelve months are limited. This study explored the long-term outcomes of adults fitted with a BAHA for UPSHL. The aims were firstly to examine subjects' pre-operative and postoperative speech perception in quiet and noise, as well as administer two standardised questionnaires, the Abbreviated Profile of Hearing Benefit (APHAB) and the Glasgow Hearing Aid Benefit Profile (GHABP). The second aim was to evaluate the responses of implanted subjects following the preoperative test protocols using a supplementary questionnaire, the Single Sided Deafness Questionnaire (SSDQ). The third aim was to monitor the subjects' implant or repair issues. In addition, questionnaire results were compared to subjects who underwent pre-operative assessment but were not implanted. All subjects had a UPSHL resulting from various aetiologies including vestibular schwannoma or other skull base tumour removal, viral infections, cochlear trauma, idiopathic sudden hearing loss, and Meniere's disease. There was a significant difference between the implanted groups' pre- and post-operative outcomes measures, indicating a treatment effect from the fitting of the BAHA device. No significant changes were found with the non-implanted groups' longterm outcome measures in regards to their perceived hearing difficulties. No significant correlations were found between outcome measures and gender, age of fitting, length of deafness, or ear affected for either group.

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19

Johnson, Earl E. "The Clear Clinical Relevance of Prescriptions for Hearing Aids and Various Hearing Losses." Digital Commons @ East Tennessee State University, 2013. https://dc.etsu.edu/etsu-works/1734.

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20

Johnson, Earl E. "The Efficient Frontier of Normal Hearing Versus the Restoration of Sensorineural Hearing Impairment via Advanced Hearing Aids." Digital Commons @ East Tennessee State University, 2014. https://dc.etsu.edu/etsu-works/1744.

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21

Rahal, Rana M. "Automatic volume settings for environment sensitive hearing aids." Thesis, University of Ottawa (Canada), 2010. http://hdl.handle.net/10393/28463.

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The development of intelligent devices is becoming a popular trend in the hearing aid industry. Such devices aim at making the user's listening experience more natural and at improving customer satisfaction. One focus of interest in this dissertation is the automatic adjustment of the hearing aid control settings to minimize the need for manual user interventions. The proposed system is based on computational intelligence tools, namely artificial neural networks and neurofuzzy systems, which have the ability to learn the dynamics of highly nonlinear systems without the need for the explicit knowledge of their mathematical models. Such techniques are adopted here to map the acoustic features (input space) to the desired volume setting (output space) of the hearing aid user. Two computational intelligence tools, a multilayer perceptron and an adaptive network-based fuzzy inference system were analyzed on three simulated users with moderate, severe, and profound hearing losses. A hearing aid simulation system provided target volume settings to train and test the learning networks, selected to optimize the speech intelligibility index in each acoustic situation. The performances of both soft computing models obtained from over 2000 recordings demonstrated a high efficiency of the adopted approach in automatically optimizing volume settings for the three simulated users. In worst case scenario 95% of the testing patterns obtained 0.06 SII error or less, over 400 audio files. A future step is to extend to an online adaptation and eventually the proposed system would be integrated into a trainable self-learning hearing aid.

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22

Ballantyne, Deborah. "An algorithm for the fitting of hearing aids." Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318218.

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23

Peterson, Patrick Mangan. "Adaptive array processing for multiple microphone hearing aids." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14466.

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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.
Includes bibliographical references (leaves 116-125).
by Patrick M. Peterson.
Sc.D.

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24

Desloge, Joseph Gilles. "Fixed-filter multimicrophone hearing aids with binaural output." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/11670.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
Includes bibliographical references (p. 159-161).
by Joseph Gilles Desloge.
M.S.

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25

As'ad, Hala. "Acoustic Beamformers and Their Applications in Hearing Aids." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/41540.

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This work introduces new binaural beamforming algorithms for hearing aids, with a robustness to errors in the estimate of the target speaker direction of arrival (DOA) and a good trade-off between noise reduction and preservation of the noise/interferers spatial impression. Three robust designs are proposed, and their robustness is confirmed by simulation results. These robust designs are a combination of binaural and monaural beamformers using two different microphone configurations: one for low frequency components and one for high frequency components. The robust designs are also found to be robust to mismatch between the anechoic propagation models used for the beamformers designs and the reverberant propagation models used to generate the signals at the microphones in the simulations. To preserve the binaural cues of the noise/interferers in the binaural beamformer outputs, a method based on a mixing/selection of different available binaural signals is proposed, using a classification from the phase and magnitude of a complex coherence function. This method is added as a post processor to the beamforming designs robust to target DOA mismatch. Simulation results show that the resulting mixed binaural output signals have a good binaural cues preservation level that outperform the benchmark design, with significant noise reduction and low target distortion. Since knowledge of source DOAs is important for beamforming noise reduction, a beamformer-based broadband multi-source DOA detection system is also developed in the thesis, using information from different frequencies or sub‐bands to obtain global estimates of sources DOAs. Simulation results shows that using one beamformer on each side is capable of detecting the DOAs of active sources under several acoustic scenarios, including scenarios with one, two, or three sources, and with or without the presence of some level of diffuse noise.

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26

Fagelson, Marc A. "Hearing Aids and the Use of Everyday Sound." Digital Commons @ East Tennessee State University, 2005. https://dc.etsu.edu/etsu-works/1621.

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27

Marzinzik, Mark. "Noise reduction schemes for digital hearing aids and their use for the hearing impaired." [S.l.] : [s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=960643990.

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28

Law, Wing-yu Zoe. "Phonological abilities of Cantonese-speaking hearing-impaired children with cochlear implants or hearing aids." Click to view the E-thesis via HKU Scholars Hub, 2003. http://lookup.lib.hku.hk/lookup/bib/B38888798.

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Thesis (B.Sc.)--University of Hong Kong, 2003.
"A dissertation submitted in partial fulfilment of the requirements for the Bachelor of Science (Speech and Hearing Sciences), The University of Hong Kong, April 30, 2003." Includes bibliographical references (p. 29-32) Also available in print.

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29

Marzinzik, Mark. "Noise reduction schemes for digital hearing aids and their use for the hearing impaired /." Aachen : Shaker, 2001. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=009303696&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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30

Han, Na. "Development of a self-report questionnaire to evaluate hearing aid outcomes in Chinese speakers." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B40988132.

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31

Wong, C. W. "Preferred frequency responses for Cantonese-speaking hearing aid users /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2204131X.

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32

Cole, Abimbola Y. "Adaptive user specific learning for environment sensitive hearing aids." Thesis, University of Ottawa (Canada), 2008. http://hdl.handle.net/10393/28083.

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One of the main complaints of hearing aid users is the difficulty of and need for frequent adjustments they have to make to the device. Typically, volume control and other settings prescribed during the hearing aid fitting process still need to be fine-tuned in real life to meet the specific varying needs of the user in different environments. Recently, learning algorithms have been introduced to minimize these problems. By taking a weighted average of the past adjustments, the device is able to adapt to the preferred setting for each environment presented. Typically, fixed learning algorithms are used for all users and environments. In reality, users have different behaviors and the optimum learning time is expected to vary over users and environments. In this thesis, we study the potential for user-specific adaptive learning of the user settings. Profiles of various types of user behaviors were generated and the optimum time constant for learning user preferences was determined in each case using fixed exponential smoothing. We show that the performance of the algorithm is clearly dependent on the user profile and no single fixed time constant is optimum for all users or situations. Three adaptive exponential smoothing methods were then evaluated. Four performance measures are proposed to evaluate these methods based on the users' preferred setting when they re-enter the same environment. For some user profiles, adaptive methods were found to perform as well as the optimum time constant when learning user preferences for volume control without having prior knowledge of the users' behavior. In particular it is shown that the method by W. M. Chow ( Journal of Industrial Engineering, 16, pp. 314-317, 1965) can be tuned to perform as well as the optimum time constant for a given user.

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33

Sooful, Prasha. "The maintenance and utilisation of government fitted hearing aids." Diss., Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-11132006-091720.

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34

Boymans, Monique. "Intelligent processing to optimize the benefits of hearing aids." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2003. http://dare.uva.nl/document/69249.

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35

Koutrouli, Eleni. "Low Complexity Beamformer structures for application in Hearing Aids." Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-17612.

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Background noise is particularly damaging to speech intelligibility for people with hearing loss. The problem of reducing noise in hearing aids is one of great importance and great difficulty. Over the years, many solutions and different algorithms have been implemented in order to provide the optimal solution to the problem. Beamforming has been used for a long time and has therefore been extensively researched. Studying the performance of Minimum Variance Distortionless Response (MVDR) beamforming with a three- and four- microphone array compared to the conventional two-microphone array, the aim is to implement a speech signal enhancement and a noise reduction algorithm. By using multiple microphones, it is possible to achieve spatial selectivity, which is the ability to select certain signals based on the angle of incidence, and improve the performance of noise reduction beamformers. This thesis proposes the use of beamforming, an existing technique in order to create a new way to reduce noise transmitted by hearing aids. In order to reduce the complexity of that system, we use hybrid cascades, which are simpler beamformers of two inputs each and connected in series. The configurations that we consider are a three-microphone linear array (monaural beamformer), a three-microphone configuration with a two-microphone linear array and the 3rd microphone in the ear (monaural beamformer), a three-microphone configuration with a two-microphone linear array and the 3rd microphone on contra-lateral ear (binaural beamformer), and finally four-microphone configurations. We also investigate the performance improvement of the beamformer with more than two microphones for the different configurations, against the two-microphone beamformer reference. This can be measured by using objective measurements, such as the amount of noise suppression, target energy loss, output SNR, speech intelligibility index and speech quality evaluation. These objective measurements are good indicators of subjective performance. In this project, we prove that most hybrid structures can perform satisfyingly well compared to the full complexity beamformer. The low complexity beamformer is designed with a fixed target location (azimuth), where its weights are calibrated with respect to a target signal located in front of the listener and for a diffuse noise field. Both second- and third- order beamformers are tested in different acoustic scenarios, such as a car environment, a meeting room, a party occasion and a restaurant place. In those scenarios, the target signal is not arriving at the hearing aid directly from the front side of the listener and the noise field is not always diffuse. We thoroughly investigate what are the performance limitations in that case and how well the different cascades can perform. It is proven that there are some very critical factors, which can affect the performance of the fixed beamformer, concerning all the hybrid structures that were examined. Finally, we show that lower complexity cascades for both second- and third- order beamformers can perform similarly well as the full complexity beamformers when tested for a set of multiple Head Related Transfer Functions (HRTFs) that correspond to a real head shape.

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36

Martin, Gregory Russell. "Studies of real-time multiband adaptive gain hearing aids." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12920.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.
Includes bibliographical references (leaves 71-72).
by Gregory Russell Martin.
M.S.

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37

SUMME, LORI ANN. "Noise Reduction in Digital Hearing Aids Using Environmental Sounds." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1052327314.

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38

Ricketts, Todd, Earl E. Johnson, and Jeremy Federman. "Individual Differences Within and Across Feedback Suppression Hearing Aids." Digital Commons @ East Tennessee State University, 2008. https://dc.etsu.edu/etsu-works/1694.

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BACKGROUND: New and improved methods of feedback suppression are routinely introduced in hearing aids; however, comparisons of additional gain before feedback (AGBF) values across instruments are complicated by potential variability across subjects and measurement methods. PURPOSE: To examine the variability in AGBF values across individual listeners and an acoustic manikin. RESEARCH DESIGN: A descriptive study of the reliability and variability of the AGBF measured within six commercially available feedback suppression (FS) algorithms using probe microphone techniques. STUDY SAMPLE: Sixteen participants and an acoustic manikin. RESULTS: The range of AGBF across the six FS algorithms was 0 to 15 dB, consistent with other recent studies. However, measures made in the participants ears and on the acoustic manikin within the same instrument suggest that across instrument comparisons of AGBF measured using acoustic manikin techniques may be misleading, especially when differences between hearing aids are small (i.e., less than 6 dB). Individual subject results also revealed considerable variability within the same FS algorithms. The range of AGBF values was as small as 7 dB and as large as 16 dB depending on the specific FS algorithm, suggesting that some models are much more robust than others. CONCLUSIONS: These results suggest caution when selecting FS algorithms clinically since different models can demonstrate similar AGBF when averaging across ears, but result in quite different AGBF values in a single individual ear.

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39

Kaltenbach, Aimee J., Marc A. Fagelson, Sherri L. Smith, and Lindsay Bondurrant. "Hearing Aids and Quality of Life in Rural Appalachia." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etsu-works/5405.

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40

Johnson, Earl E. "Essentials of Modern Hearing Aids: Selection, Fitting, and Verification." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/etsu-works/5569.

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41

Tran, Linh Thi Thuc. "Robust Techniques for Acoustic Feedback Control in Hearing Aids." Thesis, Curtin University, 2018. http://hdl.handle.net/20.500.11937/68262.

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Adaptive feedback cancellation (AFC) is the approach with the best potential to address the acoustic feedback problem. In this thesis, new AFC methods for hearing aids are investigated, they are based on combinations of widely known techniques such as two-microphone, pre-filter, fast-converging adaptive filter and variable step-size. These proposed methods not only are robust against different types of incoming signals and acoustic feedback paths, but also enhance the convergence/tracking rate while retaining low steady-state error.

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42

Cotton, Sue E. (Susan E. ). "Evaluation of FM fittings." Australia : Macquarie University, 1988. http://hdl.handle.net/1959.14/73675.

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Thesis (MA)--Macquarie University, School of English and Linguistics, 1988.
Bibliography : p. 206-209.
Introduction -- The use of continuous discourse tracking to assess degree of FM advantage received by moderately to profoundly hearing impaired children in classroom conditions -- Subjective preferences of hearing impaired children for listening through FM systems using a paired comparison procedure -- Degree of FM advantage as measured using an adaptive speech test procedure with mildly o profoundly hearing impaired children -- Benefits and use of FM systems : a survey of teachers, children and parents -- Conclusions and recommendations.
Only very limited research has examined the issue of how well FM systems are decreasing the speech perception difficulties of hearing impaired children. A comprehensive study of the effectiveness of FM fittings and factors associated with benefit was therefore undertaken using 4 different measures. Tracking of continuous discourse in classroom settings (12 subjects) showed significant improvement when FM aids were used compared to hearing aids alone. Also, significantly greater gains in tracking rate were made over 4 sessions for the FM condition compared to the hearing aid only listening condition. In order to investigate the subjective response of listeners to various features of FM processed signals, another experiment was conducted using a paired comparison procedure in noise with 21 moderately to profoundly deaf children and using two different types of FM systems. Overall results showed significant preferences for combined mode above both VOX/SOX settings and FM microphone alone settings. There were no significant preferences for microphone style, and a significant volume control setting preference (for a 5 dB higher than recommended setting) was shown for one of the two types of FM systems evaluated. The most interesting result was that, overall, listeners did not significantly prefer any FM settings to their hearing aids alone and, in fact, most listeners actually significantly preferred the aid alone to the FM alone or VOX/SOX settings. These results occurred despite the fact that a large FM advantage was shown in terms of improved S/N ratio on all these settings. However, judgements tended to be different for experienced users of at least one of the types of FM being evaluated, who significantly preferred the FM on any mode compared to their hearing aid alone. These results are discussed with regard to clinical practices and the need for demonstration to, and training and encouragement of, new users to ensure the available FM advantage is realised. A third study evaluated the clinical usefulness and accuracy of an adaptive speech test (NU-CHIPS) in noise to verify and measure degree of FM advantage. Results from 31 mildly to profoundly hearing impaired children showed that significant signal-to-noise ratio advantage was obtained overall, and that the advantage was greater on the FM alone than the C setting. Over all listening conditions through the FM, there were 28 out of a possible 51 occurrences of hearing impaired listeners performing equal to or significantly better than 11 normal hearing children also tested using this procedure. The predictive accuracy and clinical feasibility of this approach are discussed. The way in which these FM advantages are moderated by interactions with users in practical situations are described by the results from questionnaires or interviews of 75 teachers, 52 children and 14 parents regarding use, perceived benefits and problems associated with FM systems. Factors which seemed to affect perceptions and use included feelings of self-consciousness about the FM as age of users increased, lack of confidence in the systems due to frequent breakages and faults in combination with lack of knowledge about how to check the systems effectively and efficiently, problems with being able to securely attach the systems to the body, and lack of knowledge about how to make the best use of the units in a variety of situations. On the basis of all of these findings, some suggestions on how to improve FM acceptance and use are offered.
Mode of access: World Wide Web.
209 p. ill

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43

賴婧儒 and Sin-yue Celine Lai. "The disconfirmation-expectancy model of hearing aid satisfaction in first time users in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B41548073.

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44

鄺思豪 and Sy-ho Raymond Kwong. "Does acclimatization exist among Chinese first-time hearing aidusers?" Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B41548036.

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Liu, Cheuk-kiu, and 廖卓僑. "Outcome of open-fitting hearing aids among Cantonese-speaking users." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44489250.

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Kwong, Sy-ho Raymond. "Does acclimatization exist among Chinese first-time hearing aid users?" Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B41548036.

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Lai, Sin-yue Celine. "The disconfirmation-expectancy model of hearing aid satisfaction in first time users in Hong Kong." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B41548073.

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Ip, In-peng Pumpkin. "Norms for the international outcome inventory for hearing aids (IOI-HA) in Hong Kong." Click to view the E-thesis via HKU Scholars Hub, 2007. http://lookup.lib.hku.hk/lookup/bib/B42005097.

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Abstract:

Thesis (B.Sc)--University of Hong Kong, 2007.
"A dissertation submitted in partial fulfilment of the requirements for the Bachelor of Science (Speech and Hearing Sciences), The University of Hong Kong, June 30, 2007." Includes bibliographical references (p. 27-30). Also available in print.

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Lee, Kit-ching Angela. "Tone production ability in Cantonese-speaking hearing-impaired children with cochlear implants or hearing aids." Click to view the E-thesis via HKU Scholars Hub, 2007. http://lookup.lib.hku.hk/lookup/bib/B42005632.

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Abstract:

Thesis (B.Sc)--University of Hong Kong, 2007.
"A dissertation submitted in partial fulfilment of the requirements for the Bachelor of Science (Speech and Hearing Sciences), The University of Hong Kong, June 30, 2007." Includes bibliographical references (p. 26-30). Also available in print.

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Kok, Danelia. "The impact of hearing aids on the cognitive functions of postlingually hearing impaired older adults." Thesis, Kok, Danelia (2015) The impact of hearing aids on the cognitive functions of postlingually hearing impaired older adults. Honours thesis, Murdoch University, 2015. https://researchrepository.murdoch.edu.au/id/eprint/38308/.

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Background: The World Health Organisation estimates that 360 million people worldwide suffer from a disabling hearing loss (WHO, 2012). In Australia alone, one in six suffer from hearing impairment, with the incidence increasing to three out of four by the time an individual reaches 70 years of age (Wilson et al., 1999). Age Related Hearing Loss or presbycusis is a common type of hearing impairment in older adults. Hearing loss is known to affect speech perception (Moore, 1996) but is also associated with a higher risk of loneliness (Pronk et al., 2013). The effect of untreated hearing loss on cognitive functions has also been investigated. Reports by Lin et al. (2011 & 2013) indicate that untreated hearing loss is independently associated with accelerated cognitive decline, cognitive impairments in executive function and memory, and an increased risk of incident dementia. Aims: This study had two objectives; 1) determine if a significant difference exists between Normal Hearing (NH) and Hearing Aid Candidates (HAC) in mental health scores and cognitive tests of executive function and memory, and 2) investigate whether the use of hearing aids improves these mental health scores and cognitive functions in HAC. Methods: Testing was conducted at baseline before hearing aid use and three months after fitting of hearing aids. Participants completed a questionnaire on anxiety, stress, and depression as a means to obtain and control for mental state. A battery of computerised tests was used to assess cognitive functions. Results: A significant difference was found in the test of delayed visual recognition memory matching (DMS) and attention switching (AST) between NH and HAC groups. It appears that a task mediated through the temporal lobe (DMS) is impaired in HAC whereas tasks mediated through the frontal lobe (AST) showed a compensatory mechanism and therefore performance was better in the HAC. Hearing aid use did not affect these scores at three months, perhaps because three months is not long enough for acclimatisation to occur in the brain. Presbycusis sufferers displayed a higher risk for depression and stress. Hearing aids did not significantly improve this. Conclusion: More research is needed to specifically identify which cognitive functions are affected by hearing loss to target specific treatments to these areas.

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