Laboratory of Auditory Perception and Cochlear Implants

Bomjun Kwon -- Laboratory of Auditory Perception and Cochlear Implants

 

Overview. In the laboratory of auditory perception and cochlear implants at Gallaudet University, we conduct several research projects that help us understand how human listeners perceive and process various sounds (including music and speech sounds) and extract meaning from them. We test listeners with different auditory experiences with a wide range of degree of hearing loss. We often compare experimental results across listener populations: for example, normal hearing and hearing-impaired listeners (for a further classification, hearing-aid users vs. cochlear implant users), not to judge one group is better than the other(s), but to understand the different mechanisms of hearing and perception of sounds through different peripheral deficits, so that those results could be used to prescribe a better method to help hearing-aid or cochlear implant users.

 

The research in the laboratory of auditory perception and cochlear implants has been funded by an NIH grant awarded to Dr. Kwon on perceptual effects of stimulation configuration of cochlear implants. Currently, a project "User-driven Customization of Cochlear implant Programming" is supported by NIDILRR (National Institute on Disability, Independent Living, and Rehabilitation Research through a grant RERC-DHH (Rehabilitation Engineering Research Center (RERC) Grant on Deaf and Hear-of-Hearing).

 

Facilities.

 

·         Research interface for Nucleus Cochlear Implant Systems provided by Cochlear Corp

·         Research interface for Nucleus Cochlear Implant Systems provided by UCLA (formerly House Ear Institution)

·         Otoacoustic emissions measurement system (Mimosa Acoustics) 

·         TDT psychoacoustics, speech & data acquisition workstation

·         Larson Davison Sound Level Meter with calibration kit

·         Microphones, Speakers, Headphones. Digital Audio Recording Station

·         16-channel Data acquisition card with D/A A/D converter

·         Mixed domain oscilloscope (Tektronics MDO4034B-3)

 

PeopleThe laboratory is directed by Bomjun Kwon, Ph.D. External collaborators: Jill Firszt, Ph.D. and Laura Holden, Au.D. (Washington University in St. Louis School of Medicine). Jae H Park (software engineering consultant). Student research assitants: Chelsea Matesi (AuD class of 2016), Sarah Lively (AuD class of 2017), Ryan Hickman (AuD class of 2018). Alumni: Trevor Perry (currently a PhD candidate at University of Minnesota)

 

Publications and presentations.

 

Publications

·         Perry, T. T., & Kwon, B. J. (2015). Effect of masker fluctuations on lexical segmentation in cochlear implant listeners. Journal of the Acoustical Society of America, 137, 2070-2079.

·         Kwon, B. J., & Perry, T. T. (2014). Identification and multiplicity of double vowels in cochlear implant users. Journal of Speech, Language, and Hearing Research, 57, 1983-1996.

·         Kwon, B. J. (2012). AUX: A scripting language for auditory signal processing and software packages for psychoacoustic experiments and education. Behavioral Research Methods, 44, 361-373. (Open access--free to copy and distribute)

·         Kwon, B. J., Perry, T. T. & Olmstead, V. L. (2011). Effects of stimulation configurations on place pitch discrimination in cochlear implants. Journal of the Acoustical Society of America, 129, 3818-3826.

·         Kwon, B. J. (2009). Effects of electrode separation between speech and noise signals on consonant identification in cochlear implants. Journal of the Acoustical Society of America, 126, 3258-3267.

·         Kwon, B. J. & van den Honert, C. (2009). Spatial and temporal effects of interleaved masking in cochlear implants, Journal of the Association for Research in Otolaryngology, 10, 447-457.

·         Kwon, B. J. & van den Honert, C. (2006). Effect of electrode configuration on psychophysical forward masking in cochlear implant listeners. Journal of the Acoustical Society of America 119, 2994-3002.

·         Kwon, B. J. & van den Honert, C. (2006). Dual-electrode pitch discrimination with sequential interleaved stimulation by cochlear implant users. Journal of the Acoustical Society of America, 120, EL1-EL6

 

Podium Presentations

 

·         Kwon, B. J. "Fundamentals of AUX (AUditory syntaX) and its use in research and education," at 38th MidWinter Meeting of Association for Research in Otolaryngology, Baltimore, Maryland, February, 2015.

·         Kwon, B. J., "Sound effects with auditory syntax (AUX)," at 168th meeting of Acoustical Society of America, Indianapolis, Indiana, October, 2014.

·         Kwon, B. J., Perry, T. T. "Implications of rate pitch on musical perception and auditory object formation in cochlear implants," at 37th MidWinter Meeting of Association for Research in Otolaryngology, San Diego, California, February, 2014.

·         Kwon, B. J., Perry, T. T. "Identification and Enumeration of Double Vowels in Cochlear Implant Users," at 35th MidWinter Meeting of Association for Research in Otolaryngology, San Diego, California, February, 2012.

 

Poster Presentations

 

·         Perry, T. T., Kwon, B. J. "Effect of Masker Fluctuations on Lexical Segmentation in Cochlear Implant Listeners," at Conference on Implantable Auditory Prostheses, Lake Tahoe, California, July, 2013.

·         Kwon, B. J., Perry, T. T. "Effects of Context on Speech Recognition by Cochlear Implant Users," at 36th MidWinter Meeting of Association for Research in Otolaryngology, Baltimore, Maryland, February, 2013.

·         Kwon, B. J., Perry, T. T. "Capacity of Consonant Recognition in Normal Hearing and Cochlear Implant Users," at 36th MidWinter Meeting of Association for Research in Otolaryngology, Baltimore, Maryland, February, 2013.

 

Last updated 12/18/2015

 

 

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