NDLI: Ability to Discriminate an Elevation in Sound: The Effects of an Altered Pinna in Subjects with Monaural Hearing

Content Provider	IEEE Xplore Digital Library
Author	Tianyi Yan Kochiyama, T. Jinglong Wu
Copyright Year	2007
Description	Author affiliation: Kagawa Univ., Takamatsu (Tianyi Yan)
Abstract	We tested the ability of human listeners to discriminate white noise bursts in the absence of binaural discrimination cues and changed the shape of spectral cues. minimum audible angle (MAA) thresholds were determined for five subjects in a two-alternative, forced-choice, adaptive paradigm as a function of the orientation of the array of sound sources in the vertical plane (elevation). The subjects were students with normal hearing who wore a monaural earplug to reduce sound level and timing cues and were then fitted with a pinna mold to change the shape of spectral cues. Tests measured discrimination of the vertical angle in eight planes parallel to the median plane (0deg position). The results showed that the sound source position could be discriminated in the vertical plane when a subject with normal monaural hearing wore the external ear model. However, the discrimination ability worsened remarkably. The ability to discriminate the orientation of sound sources in the lower hemi-field was greater than in the upper hemi-field at the 0deg to 180deg reference positions, while the reverse was true for the 225deg to 315deg reference positions. In addition, the pinna cavities of both the near and far ears play a role in determining the perceived vertical angle of a sound source in any horizontal position, including the median plane. As a sound source shifts laterally away from the median plane, the contribution of the near ear increases, while that of the far ear decreases. For horizontal positions at azimuths greater than 180deg from the midline, the far ear mold no longer changes the shape of spectral cues for discriminating the vertical angle.
Starting Page	1454
Ending Page	1457
File Size	693416
Page Count	4
File Format	PDF
ISBN	9781424410774
DOI	10.1109/ICCME.2007.4381986
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-05-23
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Acoustic testing Shape Azimuth Humans Adaptive arrays Auditory system Ear White noise Position measurement Timing
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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