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High-probability grants
According to our matching algorithm, Xin Luo is the likely recipient of the following grants.
| Years |
Recipients |
Code |
Title / Keywords |
Matching
score |
| 2006 — 2008 |
Luo, Xin |
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. |
Enhancing Tone Recognition For Cochlear Implant Users
[unreadable] DESCRIPTION (provided by applicant): The overall long-term goal of this research is to develop novel speech processing strategies for cochlear implant users speaking tonal languages. In attempt to improve tonal language perception in cochlear implants, the present application focuses on enhancing the transmission of tonal information in electric hearing, because tonal information is crucial for speech perception in tonal languages, and that current cochlear implants do not provide sufficient tonal information for users. Three experiments are proposed to enhance different tone- related information in cochlear implants. Specific Aim 1 is to investigate whether pre-processors modifying single syllable's overall amplitude envelope, to better resemble its fundamental frequency contour, can enhance tone recognition in cochlear implants. Pilot studies revealed that such amplitude envelope modifications significantly improved Chinese tone recognition in 4-channel cochlear implant acoustic simulations, without adversely affecting vowel recognition. Tone and vowel recognition of tonal-language-speaking cochlear implant users will be tested under different amounts of such amplitude envelope modifications, to search for the best trade-off between tone recognition improvement and possible vowel recognition decrease. Specific Aim 2 is to investigate tonal language perception in speech-shaped noise or speech-babble noise with cochlear implant recipients using a hearing aid in the non-implanted ear. Pilot studies, using acoustic simulations of a cochlear implant with a hearing aid, showed that Chinese sentence recognition in speech-shaped noise was significantly enhanced as more low frequency information was added; specifically, such sentence recognition enhancement was mostly due to better tone recognition when the low frequency information was 500 Hz. The effects of frequency range and signal level of the low frequency acoustic hearing restored by a hearing aid, as a complement to the contra-lateral electric hearing, will be investigated. Specific Aim 3 is to investigate whether tonal information can be effectively encoded using extra low pitch sensations produced by wide bipolar stimulation modes in cochlear implants. Pilot studies using 4-channel cochlear implant acoustic simulations revealed that Chinese tone recognition was significantly enhanced as the number of extra frequency channels in the pitch range was increased. Device implementation and applications of mixed stimulation modes for tonal language speech processing in cochlear implants will be investigated. [unreadable] [unreadable] [unreadable]
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1 |
| 2011 — 2012 |
Luo, Xin |
R21Activity Code Description:
To encourage the development of new research activities in categorical program areas. (Support generally is restricted in level of support and in time.) |
Dynamic Pitch Perception With Cochlear Implants
DESCRIPTION (provided by applicant): Although many cochlear implant (CI) users understand speech well in quiet, most of them perform poorly in noisy conditions and in speech intonation and music melody recognition. Dynamic pitch cues are crucial to improve performance in these challenging listening tasks. However, little is known about the mechanisms and factors that contribute to CI users'dynamic pitch perception. In this project, experiments are proposed to investigate and enhance dynamic pitch perception with CI using novel coding strategies. It's hypothesized that optimally combining place and temporal pitch cues within and across frequency channels and using frequency glides to connect discrete tone bursts will lead to better identification of pitch change patterns. The hypotheses will be tested by three experiments with specific aims. Aim 1 is to assess CI users'pitch contour identification with combined place and temporal pitch cues on individual electrode pairs. Aim 2 is to assess CI users'pitch contour discrimination interference between a signal and a masker channels. Aim 3 is to assess CI users'pitch discrimination and melodic contour identification with discrete tone bursts connected by frequency glides. The outcomes of these psychophysical experiments will advance our knowledge on the integration of dynamic pitch cues by CI users, tell us if continuous and discrete pitch changes are differently perceived by CI users, and suggest effective ways to enhance speech intonation, music melody, and noisy speech recognition with CI. PUBLIC HEALTH RELEVANCE: The proposed research will greatly help cochlear implant users face the big challenges of recognizing speech intonations, music melodies, and speech in noise. Improved performance in these tasks will increase the overall quality of life and reverse the social isolation for a large number of cochlear implant users.
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1 |