Sub-cortical envelope and fine structure cues: the interaction of age and individual differences for normal-hearing adults in complex environments

2012 ◽  
Vol 131 (4) ◽  
pp. 3317-3317
Author(s):  
Dorea Ruggles ◽  
Hari Bharadwaj ◽  
Barbara Shinn-Cunningham
Keyword(s):  
Fine Structure ◽  
Individual Differences ◽  
Normal Hearing ◽  
Complex Environments

Effect of Speech Material on the Benefit of Temporal Fine Structure Information in Speech for Young Normal-Hearing and Older Hearing-Impaired Participants

2012 ◽  
Vol 33 (3) ◽  
pp. 377-388 ◽  
Author(s):  
Thomas Lunner ◽  
Renskje K. Hietkamp ◽  
Martin R. Andersen ◽  
Kathryn Hopkins ◽  
Brian C. J. Moore
Keyword(s):  
Fine Structure ◽  
Normal Hearing ◽  
Hearing Impaired ◽  
Temporal Fine Structure ◽  
Structure Information

Cochlear Sources and Otoacoustic Emissions

2010 ◽  
Vol 21 (03) ◽  
pp. 176-186 ◽  
Author(s):  
Tiffany A. Johnson
Keyword(s):  
Fine Structure ◽  
Otoacoustic Emissions ◽  
Stimulus Frequency ◽  
Normal Hearing ◽  
Clinical Applications ◽  
Clinical Test ◽  
Similar Amount ◽  
Distortion Product ◽  
Stimulus Parameters ◽  
Coherent Reflection

Current understanding suggests that there are two different mechanisms by which otoacoustic emissions (OAEs) are generated in the cochlea. These mechanisms include a nonlinear-distortion mechanism and a coherent-reflection mechanism. Distortion product OAEs (DPOAEs) are believed to include contributions from both mechanisms, while stimulus frequency OAEs (SFOAES), at least at low and moderate levels, are believed to be generated primarily by the coherent-reflection mechanism. In the case of DPOAEs, the interaction of the two mechanisms produces a series of alternating peaks and valleys in the response level when recorded in small frequency increments. This pattern of peaks and valleys typically is referred to as fine structure. There has been much speculation that the interaction of the two mechanisms and the resulting fine structure limits the clinical test performance of DPOAEs. There are few data to address this speculation. Here, we review the literature that describes the cochlear source mechanisms and their potential relationship to clinical applications. We then present results for preliminary data collected in a group of 10 normal-hearing subjects where we explore the influence of common approaches to setting DPOAE stimulus parameters on the resulting fine structure. These preliminary results suggest that, at the moderate stimulus levels used in clinical applications, each of the different stimulus parameters results in a similar amount of fine structure and, therefore, fine structure cannot be eliminated through manipulation of stimulus parameters. We also review the results of some preliminary efforts to identify stimulus parameters that can be used to record SFOAEs (OAEs generated by the reflection mechanism). The potential clinical applications of SFOAEs have received little attention in the literature. By identifying stimulus parameters producing robust responses in normal-hearing ears, it may be possible to more fully evaluate clinical applications of SFOAEs.

Perception of a Sung Vowel as a Function of Frequency-Modulation Rate and Excursion in Listeners With Normal Hearing and Hearing Impairment

2014 ◽  
Vol 57 (5) ◽  
pp. 1961-1971
Author(s):  
Marianna Vatti ◽  
Sébastien Santurette ◽  
Niels Henrik Pontoppidan ◽  
Torsten Dau
Keyword(s):  
Hearing Loss ◽  
Individual Differences ◽  
Hearing Impairment ◽  
Fundamental Frequency ◽  
Frequency Modulation ◽  
Normal Hearing ◽  
Musical Experience ◽  
Singing Voice ◽  
Modulation Rate ◽  
Frequency Changes

Purpose Frequency fluctuations in human voices can usually be described as coherent frequency modulation (FM). As listeners with hearing impairment (HI listeners) are typically less sensitive to FM than listeners with normal hearing (NH listeners), this study investigated whether hearing loss affects the perception of a sung vowel based on FM cues. Method Vibrato maps were obtained in 14 NH and 12 HI listeners with different degrees of musical experience. The FM rate and FM excursion of a synthesized vowel, to which coherent FM was applied, were adjusted until a singing voice emerged. Results In NH listeners, adding FM to the steady vowel components produced perception of a singing voice for FM rates between 4.1 and 7.5 Hz and FM excursions between 17 and 83 cents on average. In contrast, HI listeners showed substantially broader vibrato maps. Individual differences in map boundaries were, overall, not correlated with audibility or frequency selectivity at the vowel fundamental frequency, with no clear effect of musical experience. Conclusion Overall, it was shown that hearing loss affects the perception of a sung vowel based on FM-rate and FM-excursion cues, possibly due to deficits in FM detection or discrimination or to a degraded ability to follow the rate of frequency changes.

scholarly journals Temporal Fine-Structure Coding and Lateralized Speech Perception in Normal-Hearing and Hearing-Impaired Listeners

2016 ◽  
Vol 20 ◽  
pp. 233121651666096 ◽  
Author(s):  
Gusztáv Lőcsei ◽  
Julie H. Pedersen ◽  
Søren Laugesen ◽  
Sébastien Santurette ◽  
Torsten Dau ◽  
...  
Keyword(s):  
Fine Structure ◽  
Speech Perception ◽  
Normal Hearing ◽  
Hearing Impaired ◽  
Temporal Fine Structure
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