17th ANNUAL EARLY HEARING DETECTION & INTERVENTION MEETING
March 18-20, 2018 • Denver, CO
| Spectral Modulation Cutoff Frequency in Normal Hearing Listeners
Spectral Modulation Cutoff Frequency in Normal Hearing Listeners
Children with profound sensorineural hearing loss are receiving cochlear implantation earlier in life, providing auditory access and the potential to discriminate speech and acquire spoken language. However, predicting outcomes of individuals that receive a cochlear implant (CI) are highly variable and determining device efficacy are currently limited to measures of open-set speech perception. Research on spectral resolution in normal hearing and hearing impaired adults and children has shown that a measure called Spectral Ripple Discrimination (SRD) is a feasible measure of spectral resolution and a potential non-linguistic measure of CI efficacy.
SRD measures a listener’s ability to perceive changes in phase of the amplitude spectrum of a complex sound. Performance depends on two auditory capabilities: 1) frequency resolution, and 2) sensitivity to intensity differences of peaks and troughs in the amplitude spectrum (or across-channel intensity resolution). Although frequency resolution matures by age 6 months in normal hearing listeners, SRD does not become adult like until 7-10 years of age. This suggests that frequency resolution and across-channel intensity resolution have different trajectories of maturation. One way to separate these factors is to determine how SRD thresholds vary as a function of modulation depth. The shape of this spectral modulation transfer function is logarithmic with the x-intercept indicating across-channel intensity resolution and the slope indicating frequency resolution.
SRD will be used to test 7 to 10 year olds and young adults. It is expected that the school-aged participants would have mature frequency resolution but poor sensitivity to across-channel intensity changes. Previous SMTF methods required measuring 5 different thresholds and fitting a function. To assess the feasibility of using an abbreviated two-point method for testing SRD, thresholds using both methods will be obtained on adults and then compared Using this method, only two thresholds need to be obtained to generate a cut-off frequency. Patient fatigue and habituation would be eliminated using this testing, allowing for quicker testing.
- To assess immaturities of spectral resolution in 7 to 10 year olds, when compared to adult listeners, using a spectral ripple discriminatin task
- To assess the feasibility of using an abbreviated 2-point method when testing spectral ripple discrimination
- N/A
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Presenters/Authors
Alice Kuang
(), University of Washington LEND, akuang91@uw.edu;
Hello, my name is Alice. I am currently a 3rd year audiology student and LEND trainee at the University of Washington in Seattle, Washington. I am very interested in working with children with a variety of hearing impairments within an interdisciplinary team. I am apart of the Pediatric Amplification Lab located at The Virginia Merrill Bloedel Hearing Research Center. In my lab, I work with Dr. David Horn on my capstone project that will assess the use of Spectral Ripple Discrimination (SRD), as a measure of spectral resolution, on normal hearing and cochlear implanted children and adults. Next year, I will be completing my 4th year externship at Stanford Ear Institute in Palo Alto, California. There I hope to continue honing my skills working with a diverse population and building upon my leadership experience.
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