March 31, 2017 - 12:00pm
308 Wendell Johnson Speech & Hearing Center
Title: Effect of Level on Spectral Ripple Detection Thresholds in Adults with Normal Hearing and Sensorineural Hearing Loss
Presented by: Erik Jorgensen
Abstract: The purpose of this study was to investigate the effect of level on spectral ripple detection threshold (SRDT) and whether this effect varied as a function of ripples per octave (RPO) and hearing status. The ability to detect changes in spectral ripple noise has been shown to correlate with speech perception abilities, and examining the effect of level on SRDT may partially explain why some listeners suffer poor speech understanding despite the speech signal being audible. The modulation depth required to detect a rippled noise from an unmodulated noise was measured in subjects with and without sensorineural hearing loss at three spectral densities (0.5, 2 and 4 RPO) and varying stimulus levels. Level, hearing status, and spectral density significantly affected SRDT. At 2 and 4 RPO, SRDT was quadratic as a function of level. At .5 RPO, SRDT decreased monotonically with increases in SL. The effect of level was greater for higher RPO. SRDT was also significantly affected by hearing status, with higher PTAs associated with higher SRDT for all RPOs. These observations are consistent with the view that spectral ripple perception is at least partially dependent on spectral resolution.
Title: Risk Factors Associated with Childhood Hearing Loss: A 3-Year Review
Presented by: Kelsey Dumanch
Abstract: In their 2007 position statement, the Joint Committee on Infant Hearing identified risk factors associated with childhood hearing loss; however, studies demonstrating the associations are mixed. Iowa’s Early Hearing Detection and Intervention legislation mandates reporting of these risk factors and reporting of audiologic evaluations for children up to 3 years of age. This retrospective study analyzed data for the 115,039 children born in Iowa from 2010 through 2012. Data analyses included prevalence rates, odds ratios, and Fisher’s exact test of statistical significance. 90% of children were born with no risk factors for hearing loss; of those, 99.9% demonstrated normal hearing by three years of age. Of the 10% of children born with risk factors, 96.3% demonstrated normal hearing by age 3. Factors that placed children at the highest risk of congenital hearing impairment were neurodegenerative disorders, syndromes, and congenital infections. Factors that placed children at the highest risk of developing permanent postnatal hearing loss were congenital cytomegalovirus, syndromes, and craniofacial anomalies. Results suggest certain risk factors place a child at significantly greater risk of hearing loss. This demonstrates the need for continued risk monitoring and diagnostic testing to remain a priority for children with certain risk factors for hearing loss.
Individuals with disabilities are encouraged to attend all University of Iowa sponsored events. If you are a person with a disability who requires an accommodation in order to participate in this program, please contact John A. Williams in advance at 319.335.8718.
The University of Iowa
The 25th Annual International Conference, Management of the Tinnitus & Hyperacusis Patient, will be June 15-16, 2017, at the University of Iowa. Both professionals and patients are welcomed. For additional information, check the conference website. The conference is sponsored by the Department of Otolaryngology - Head and Neck Surgery and the Department of Communication Sciences and Disorders at the University of Iowa.
March 3, 2016 to March 5, 2016
Iowa's Assistant Professor Yu-Hsiang Wu and AuD student Kelsey Dumanch present their work at the American Audiology Society annual meeting.