Cochlear implant listeners today enjoy reasonably good speech understanding in quiet but generally experience severe deterioration in performance in the presence of background sounds. To provide usable speech information through the cochlear implant in the presence of competing sources (speech or nonspeech), basic principles underlying the perception of complex, multichannel stimuli by the electrically stimulated auditory system need to be investigated. This proposal aims to investigate mechanisms underlying complex pattern perception by cochlear implant listeners. The long-term goal of this research is to discover fundamental principles of complex stimulus perception by both electrically stimulated and normal hearing auditory systems. Two hypotheses will be investigated: a) that principles of perceptual organization can be used by cochlear implant listeners for separating out sounds from multiple sources and b) noise is important in signal processing by biological systems in general and by the auditory system in particular, and the right kind of noise introduced into cochlear implants will be beneficial. The proposed experiments are designed to measure the perceptual interactions between pulse-train carriers with similar / dissimilar temporal envelopes exciting adjacent / distant tonotopic locations. Methods will include detection and discrimination of complex stimuli, perceptual difference measures, and auditory streaming measures. Effects of noise on the detection of envelope cues in single- and multi-channel complex stimuli will be measured. It is expected that this research will yield fundamental insight into mechanisms of auditory perception with cochlear implants. Because of their fundamental nature, the findings are likely to also further our understanding of the normally functioning auditory system.

Agency
National Institute of Health (NIH)
Institute
National Institute on Deafness and Other Communication Disorders (NIDCD)
Type
Research Project (R01)
Project #
5R01DC004786-05
Application #
6861779
Study Section
Special Emphasis Panel (ZRG1-IFCN-6 (01))
Program Officer
Donahue, Amy
Project Start
2002-04-01
Project End
2007-03-31
Budget Start
2005-04-01
Budget End
2006-03-31
Support Year
5
Fiscal Year
2005
Total Cost
$218,380
Indirect Cost
Name
University of Maryland College Park
Department
Other Health Professions
Type
Schools of Arts and Sciences
DUNS #
790934285
City
College Park
State
MD
Country
United States
Zip Code
20742
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Peng, Shu-Chen; Lu, Hui-Ping; Lu, Nelson et al. (2017) Processing of Acoustic Cues in Lexical-Tone Identification by Pediatric Cochlear-Implant Recipients. J Speech Lang Hear Res 60:1223-1235
Tejani, Viral D; Schvartz-Leyzac, Kara C; Chatterjee, Monita (2017) Sequential stream segregation in normally-hearing and cochlear-implant listeners. J Acoust Soc Am 141:50
Schvartz-Leyzac, Kara C; Chatterjee, Monita (2015) Fundamental-frequency discrimination using noise-band-vocoded harmonic complexes in older listeners with normal hearing. J Acoust Soc Am 138:1687-95
Deroche, Mickael L D; Culling, John F; Chatterjee, Monita et al. (2014) Roles of the target and masker fundamental frequencies in voice segregation. J Acoust Soc Am 136:1225
Ding, Nai; Chatterjee, Monita; Simon, Jonathan Z (2014) Robust cortical entrainment to the speech envelope relies on the spectro-temporal fine structure. Neuroimage 88:41-6
Chatterjee, Monita; Kulkarni, Aditya M (2014) Sensitivity to pulse phase duration in cochlear implant listeners: effects of stimulation mode. J Acoust Soc Am 136:829-40
Deroche, Mickael L D; Culling, John F; Chatterjee, Monita (2014) Phase effects in masking by harmonic complexes: detection of bands of speech-shaped noise. J Acoust Soc Am 136:2726-36
Deroche, Mickael L D; Culling, John F; Chatterjee, Monita et al. (2014) Speech recognition against harmonic and inharmonic complexes: spectral dips and periodicity. J Acoust Soc Am 135:2873-84
Deroche, Mickael L D; Lu, Hui-Ping; Limb, Charles J et al. (2014) Deficits in the pitch sensitivity of cochlear-implanted children speaking English or Mandarin. Front Neurosci 8:282

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