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High-probability grants
According to our matching algorithm, Lawrence L. Feth is the likely recipient of the following grants.
Years |
Recipients |
Code |
Title / Keywords |
Matching score |
1985 — 1986 |
Feth, Lawrence L |
R03Activity Code Description: To provide research support specifically limited in time and amount for studies in categorical program areas. Small grants provide flexibility for initiating studies which are generally for preliminary short-term projects and are non-renewable. |
Auditory Temporal Acuity Following Noise Exposure @ University of Kansas Lawrence
The present investigation will focus on subtle temporary changes in human temporal acuity (gap discrimination) brought about by listening to moderatley intense noises for a brief period of time. Test signals will be octave-band noises (center frequencies = 300, 800, and 2000 Ha). Off-frequency spectral cues will be reduced with the application of a simultaneous broad-band notched noise. The study is designed to provide answers to the following research questions: (1) following exposure to noise, is the relationship between the frequency of stimulation and gap discrimination thresholds significantly different from that observed prior to noise exposure; (2) are significant changes in gap discrimination thresholds observable as a function of the amount of time that has elapsed after the termination of the noise and are these changes related to the freequency or intensity of the stimulus; (3) is the relationship between pre- and post-noise gap discrimination thresholds significantly affected by changes in post-noise signal level? The measurement of suprathreshold varibles, rather than absolute sensitivity, may be a more meaningful way of quantifying an individual's susceptibility to noise exposure. Specifically, this investigation of teporal acuity may provide the basis for developing a more sensitive tool for evaluationg the effects of noise on hearing. Information from this study may also help us understand the temporal processing capabilities of some hearing-impaired individuals. Designers of auditory prosthetic devices (e.g., hearing aids and cochlear implants) may be able to develop instruments which allow impaired listeners to make more effective use of their residual temporal resolving capacities, thus enhancing their communicative abilities.
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0.927 |
1989 |
Feth, Lawrence L |
F06Activity Code Description: Undocumented code - click on the grant title for more information. |
Ewaif and Pulse-Ribbon Models of Auditory Perception |
1 |
2005 — 2007 |
Feth, Lawrence L |
R01Activity Code Description: To support a discrete, specified, circumscribed project to be performed by the named investigator(s) in an area representing his or her specific interest and competencies. |
Auditory Spectral Integration: Complex Sounds and Speech
DESCRIPTION (provided by applicant): Auditory spectral integration has been reported, primarily in the speech perception literature, for at least 50 years. Under some conditions, spectral components falling within a critical region of approximately 5 ERBu (3.5 Bark) are processed by the central auditory system so that two or more resonance peaks are approximated by a single peak located at the spectral center-of-gravity, COG, of the original sound. These findings lead to a "resolution vs. integration" paradox for the frequency domain analogous to the "resolution vs. integration" paradox in the time domain (Viemeister, 1996). Recently, Lublinskaja (1996) demonstrated that changing the COG of a two-resonance signal over time leads listeners to hear a frequency transition that follows the dynamic COG. In our previous work, we developed a computational model and applied it to the COG effect for both static and dynamic signals. In the proposed work we will first better define the stimulus parameters that limit listener performance in spectral integration tasks and use our findings to revise and improve the model. To that end, we will assess the effect of uncertainty in signal parameters on performance for both static and dynamic complex sounds. In addition to listeners with normal hearing, we will test listeners with sensori-neural hearing loss due to outer hair cell dysfunction. These studies will help us better understand the spectral integration phenomenon. In addition to the aim of exploring the psychoacoustic aspects of the COG phenomenon, a second specific aim of this project is to address the function, limits and salience of COG effects (broadly defined) within the context of speech perception. This inquiry will take a different approach than that taken by the majority of studies in the literature in that we will not be strictly limiting our manipulations of the acoustic signal to formant frequency, formant amplitudes and/or individual harmonics. If this dynamic COG effect proves to be robust, it may be possible to incorporate it into novel signal processing schemes for cochlear implant users for whom dynamic sounds pose a challenge.
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1 |