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Minimizing auditory spatial ambiguities using listener rotation for normal and hearing impaired listeners

Award Number: F32DC017676
ORGANIZATION: NATIONAL INSTITUTE ON DEAFNESS AND OTHER COMMUNICATION DISORDERS
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: FELLOWSHIP/SCHOLARSHIP/STUDENT LOANS

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Summary Listeners integrate multisensory (e.g. vision, vestibular) and multisystems (e.g. motor control, feedback) inputs with auditory processing to localize sound sources in the world around them. The proposed research aims at an improved understanding of this process for normal hearing (NH) and hearing impaired (HI) listeners. We will test moderately impaired listeners who wear hearing aids (HA), and profoundly impaired listeners bilaterally implanted with cochlear implants (CI), along with NH listeners for baseline measures. NH listeners use head movements to resolve auditory spatial ambiguities such as front-back confusions, where listeners correctly estimate the angular position of a sound source but cannot reliably determine if it is in front or behind. New data collected by Dr. Pastore (paper in press) show that many CI listeners can use rotational head movements to avoid front-back confusions. Initial pilot data with NH listeners suggest that movement may also improve localization acuity in reverberation. These preliminary data suggest that HA and CI users may use head movements to simplify and parse their auditory environment more effectively than lab estimates under stationary conditions suggest. The knowledge gained from this research should prove valuable to designers of “smart” processors for cochlear implants and hearing aids. The Spatial Hearing Laboratory is equipped with a programmable, rotating chair and an azimuthal ring of 24 loudspeakers, synchronized to present stimuli based on listeners' angular velocity and position, offering control over several dynamic sensory and systems inputs involved in localizing sounds during listener rotation. In this facility, we will measure two indicators of the benefit of listeners' rotational movement. The first Aim will continue to investigate CI and HA listeners' ability to resolve front-back confusions in sound source localization tasks using their own movement by measuring the interaction of stimulus duration and listener movement in CI listeners' ability to resolve front-back confusions while rotating. This will offer insights into dynamic auditory spatio-temporal processing in both populations. The second Aim will investigate NH, CI, and HA listeners' ability to “learn” the acoustic patterns of a modeled reverberant space and use this to simplify the perceived auditory scene when listeners are rotating versus stationary. We will measure these listeners' ability to group a single simulated direct sound together with a simulated reflection into one perceived auditory object located at or near the location of the first presented stimulus – the so-called “buildup of the precedence effect.”


Issue Date FY	Funding FY	Legal Entity Name	Legal Entity Address	Legal Entity City	Legal Entity State	Legal Entity Zip Code	Legal Entity COUNTY	Legal Entity COUNTRY	Assistance Listing	Award Code	Budget Year	Action Date	Action Type	Action Amount

Issue Date FY: 2023 ( Subtotal = $0 )
2023	2018	ARIZONA STATE UNIVERSITY	660 S MILL AVENUE STE 204	TEMPE	AZ	85281	MARICOPA	USA	Research Related to Deafness and Communication Disorders	000	1	1/19/2023	NEW	$0
														Subtotal = $0

Issue Date FY: 2021 ( Subtotal = $70,458 )
2021	2021	ARIZONA STATE UNIVERSITY	660 S MILL AVE STE 312	TEMPE	AZ	85281	MARICOPA	USA	Research Related to Deafness and Communication Disorders	000	3	12/24/2020	NON-COMPETING CONTINUATION	$64,554
2021	2021	ARIZONA STATE UNIVERSITY	660 S MILL AVE STE 312	TEMPE	AZ	85281	MARICOPA	USA	Research Related to Deafness and Communication Disorders	002	3	2/2/2021	NON-COMPETING CONTINUATION	$1,152
2021	2021	ARIZONA STATE UNIVERSITY	660 S MILL AVE STE 312	TEMPE	AZ	85281	MARICOPA	USA	Research Related to Deafness and Communication Disorders	001	3	12/31/2020	NON-COMPETING CONTINUATION	$4,752
														Subtotal = $70,458

Issue Date FY: 2020 ( Subtotal = $66,446 )
2020	2020	ARIZONA STATE UNIVERSITY	660 S MILL AVE STE 312	TEMPE	AZ	85281	MARICOPA	USA	Research Related to Deafness and Communication Disorders	001	2	2/12/2020	NON-COMPETING CONTINUATION	$2,700
2020	2020	ARIZONA STATE UNIVERSITY	660 S MILL AVE STE 312	TEMPE	AZ	85281	MARICOPA	USA	Research Related to Deafness and Communication Disorders	000	2	12/19/2019	NON-COMPETING CONTINUATION	$63,746
														Subtotal = $66,446

Issue Date FY: 2018 ( Subtotal = $59,038 )
2018	2018	ARIZONA STATE UNIVERSITY	660 S MILL AVE STE 312	TEMPE	AZ	85281	MARICOPA	USA	Research Related to Deafness and Communication Disorders	000	1	8/20/2018	NEW	$59,038
														Subtotal = $59,038

Grand Total All Awards = $195,942

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Minimizing auditory spatial ambiguities using listener rotation for normal and hearing impaired listeners

Award Number: F32DC017676

ORGANIZATION: NATIONAL INSTITUTE ON DEAFNESS AND OTHER COMMUNICATION DISORDERS

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

AWARD ACTIVITY TYPE: FELLOWSHIP/SCHOLARSHIP/STUDENT LOANS

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