The long-term aim of the project is an understanding of the causes for the hearing disability experienced by cochlear-impaired listeners in background noise. Of particular interest in the present project are across-frequency processes involving time-varying sounds in normal-hearing and hearing-impaired listeners.
One specific aim of this project is to determine the stimulus characteristics that are associated with poor temporal analysis in cochlear-impaired listeners, both for within-channel and for across-channel auditory processes. A related goal of the studies in this area will be to determine the role of loudness recruitment in temporal analysis. The second specific aim of the project is an understanding of comodulation masking release (CMR) in terms of competing detection cues. A particular focus here is the influence of competing cues in cochlear-impaired listeners where some cues may be coded well and others coded poorly. The third specific aim is to determine how temporal information is combined across frequency in temporal analysis. One goal here will be to determine how across-frequency energy is combined in a hearing-impaired ear, when some information is associated with regions of good hearing and other information is associated with regions of poor hearing. A second goal is to determine how temporal information is combined acrosS frequency in normal hearing, testing hypotheses that the ear can sum energy acrosS frequency, or that the ear can choose the auditory channel containing the """"""""best"""""""" information. The fourth specific aim determine the effects of cochlear hearing loss on the recognition and discrimination of signals in comodulated noise backgrounds and in backgrounds where binaural difference cues are present. The studies in this area should provide new information about the effect of cochlear loss on signal recognition/discrimination in monaural and binaural masking release. Testing will be performed in a sound-treated room, using forced choice adaptive procedures. Subjects will include normal-hearing control groups and groups of listeners having hearing loss of cochlear origin. Data will be analyzed using simple descriptive statistics, correlation, and analysis of variance.

Agency
National Institute of Health (NIH)
Institute
National Institute on Deafness and Other Communication Disorders (NIDCD)
Type
Research Project (R01)
Project #
5R01DC000418-10
Application #
2125608
Study Section
Hearing Research Study Section (HAR)
Project Start
1986-09-01
Project End
1998-08-31
Budget Start
1995-09-01
Budget End
1996-08-31
Support Year
10
Fiscal Year
1995
Total Cost
Indirect Cost
Name
University of North Carolina Chapel Hill
Department
Surgery
Type
Schools of Medicine
DUNS #
078861598
City
Chapel Hill
State
NC
Country
United States
Zip Code
27599
Ozmeral, Erol J; Buss, Emily; Hall 3rd, Joseph W (2016) The Effects of Sensorineural Hearing Impairment on Asynchronous Glimpsing of Speech. PLoS One 11:e0154920
Hall 3rd, Joseph W; Buss, Emily; Ozmeral, Erol J et al. (2016) The effect of noise fluctuation and spectral bandwidth on gap detection. J Acoust Soc Am 139:1601
Buss, Emily; Dai, Huanping; Hall 3rd, Joseph W (2015) Effect of stimulus bandwidth and duration on monaural envelope correlation perception. J Acoust Soc Am 137:EL51-7
Buss, Emily; Hall 3rd, Joseph W; Grose, John H (2013) Monaural envelope correlation perception for bands narrower or wider than a critical band. J Acoust Soc Am 133:405-16
Hall 3rd, Joseph W; Buss, Emily; Grose, John H (2013) Wideband monaural envelope correlation perception. Adv Exp Med Biol 787:383-90
Ozmeral, Erol J; Buss, Emily; Hall, Joseph W (2012) Asynchronous glimpsing of speech: spread of masking and task set-size. J Acoust Soc Am 132:1152-64
Buss, Emily; Grose, John H; Hall, Joseph W (2012) Frequency discrimination under conditions of comodulation masking release (L). J Acoust Soc Am 131:2557-60
Buss, Emily; Whittle, Lisa N; Grose, John H et al. (2009) Masking release for words in amplitude-modulated noise as a function of modulation rate and task. J Acoust Soc Am 126:269-80
Hall 3rd, Joseph W; Buss, Emily; Grose, John H (2008) The effect of hearing impairment on the identification of speech that is modulated synchronously or asynchronously across frequency. J Acoust Soc Am 123:955-62
Buss, Emily; Hall 3rd, Joseph W (2008) Factors contributing to comodulation masking release with dichotic maskers. J Acoust Soc Am 124:1905-8

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