Temporal integration of the acoustic -reflex threshold and its age -related changes.
Item
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Title
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Temporal integration of the acoustic -reflex threshold and its age -related changes.
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Identifier
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AAI9959176
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identifier
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9959176
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Creator
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Emmer, Michele Bonnie.
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Contributor
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Adviser: Shlomo Silman
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Date
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2000
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Language
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English
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Publisher
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City University of New York.
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Subject
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Health Sciences, Audiology | Physics, Acoustics
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Abstract
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This study investigated age-related effects and changes on temporal integration of the acoustic-reflex threshold (ART) for broad-band noise (BBN) and 1000-Hz tonal activators. There were forty subjects comprised of 20 young adults (10 females and 10 males) and 20 older adults (10 females and 10 males). For both activating stimuli, temporal integration of the ART was investigated using 1-dB intensity increments and a high-resolution strip-chart recorder for the following activating stimulus durations: 12 msec, 25 msec, 50 msec, 100 msec, 200 msec, 300 msec, 500 msec, and 1000 msec.;Temporal integration for both BBN and 1000-Hz tonal stimulus activators was analyzed using analysis of variance (ANOVA), analysis of covariance (ANCOVA), and analysis of trend. The results indicated the absence of a significant age-related effect on temporal integration of the ART for the 1000-Hz tonal activator. In contrast, a significant age-related effect was present for temporal integration of the ART for the BBN activator. This age-related effect for temporal integration for the BBN activator was observed at activator stimulus durations of over 200 msec.;The absence of an age-related effect for temporal integration for the tonal activator, and its presence for the BBN activator, were explained primarily in relation to age-related changes of the outer-hair cells (OHCs) which are known to be first affected by age. This change in the OHCs was theorized to be the major factor for the age-related effects on the BBN ART. Clinical and research data were presented to support this hypothesis.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
