• Login
    View Item 
    •   Home
    • UA Graduate and Undergraduate Research
    • UA Theses and Dissertations
    • Dissertations
    • View Item
    •   Home
    • UA Graduate and Undergraduate Research
    • UA Theses and Dissertations
    • Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of UA Campus RepositoryCommunitiesTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournalThis CollectionTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournal

    My Account

    LoginRegister

    About

    AboutUA Faculty PublicationsUA DissertationsUA Master's ThesesUA Honors ThesesUA PressUA YearbooksUA CatalogsUA Libraries

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    MICROSTRUCTURE AUDIOGRAMS AND PSYCHOPHYSICAL TUNING CURVES FROM SUBJECTS WITH SPONTANEOUS OTOACOUSTIC EMISSIONS (HEARING, ACOUSTICS).

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    azu_td_8522805_sip1_m.pdf
    Size:
    2.986Mb
    Format:
    PDF
    Description:
    azu_td_8522805_sip1_m.pdf
    Download
    Author
    BRIGHT, KATHRYN ELIZABETH.
    Issue Date
    1985
    Keywords
    Audiometry.
    Hearing levels.
    Advisor
    Glattke, Ted
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Spontaneous otoacoustic emissions (SOAEs) are narrowband continuous signals that can be recorded from the ear canals of humans in the absence of external stimulation. SOAEs have been detected in 30 to 50% of individuals whose hearing is within normal limits. They are believed to originate in the cochlea but the mechanism by which they are produced remains unknown. It has not been determined if SOAEs are an indication of subtle abnormality in the cochlea or if they are the result of an auditory system that is functioning normally. Most investigators agree, however, that an active source of energy within the cochlea is required for the generation of SOAEs. The objective of this study was to describe the effects of SOAEs on behavioral sensitivity and frequency selectivity. Eight subjects with SOAEs were evaluated. Sensitivity was measured using a Bekesy tracking method to obtain thresholds at 30-Hz intervals. Microstructure audiograms were obtained in this manner from the frequency region surrounding the SOAE and from the same frequency region in the other ear where no SOAE was detected. Frequency selectivity was assessed using a Bekesy tracking method to obtain psychophysical tuning curves (PTCs) from frequency regions with and without SOAEs. SOAEs were found to be associated consistently with threshold minima (regions of increased sensitivity) on the microstructure audiograms, although not all threshold minima corresponded to SOAE frequencies. PTCs centered at SOAE frequencies were characterized by higher Q10 values than PTCs from the same frequency region in the other ear or from a higher frequency region in the same ear. The high and low frequency slopes were not found to differ significantly when PTCs from frequency regions with and without SOAEs were compared. These results suggest that the differences between PTCs obtained from frequency regions with and without SOAES are restricted to the tips of the PTCs. Complex interactions among the SOAE, the probe tone, and the masker were thought to be responsible for the enhanced frequency selectivity observed near SOAE frequencies and manifested by higher Q10 values.
    Type
    text
    Dissertation-Reproduction (electronic)
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Speech and Hearing Sciences
    Graduate College
    Degree Grantor
    University of Arizona
    Collections
    Dissertations

    entitlement

     
    The University of Arizona Libraries | 1510 E. University Blvd. | Tucson, AZ 85721-0055
    Tel 520-621-6442 | repository@u.library.arizona.edu
    DSpace software copyright © 2002-2017  DuraSpace
    Quick Guide | Contact Us | Send Feedback
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.