Graduation Year

2004

Document Type

Dissertation

Degree

Au.D.

Degree Granting Department

Audiology

Major Professor

Lister, Jennifer

Keywords

frequency disparity, frequency region, age, temporal resolution

Abstract

Deficits in temporal resolution may underlie the speech understanding difficulties experienced by older listeners in degraded acoustic environments. In real listening environments, important temporal cues are surrounded by stimuli of varying frequency. This study was designed to assess temporal resolution as a function of frequency region, frequency-disparity, and age in listeners with normal hearing. Design: Gap duration difference limens (GDDLs) were measured using leading and trailing markers that were fixed at the same frequency (fixed-frequency) or at frequencies 1/2 octave apart (frequency-disparate) for two groups of listeners with normal hearing: (1) 18-22 years and (2) 55-66 years. Two distinct frequency regions were represented, 500 Hz and 4000 Hz. Results: The results indicated significant effects of age, frequency region, and frequency disparity on GDDLs.

Poorer overall performance was observed for the older listeners, the lower frequency region, and the frequency-disparate condition. Conclusions: Gap discrimination is negatively affected by advanced age, lower marker frequencies, and larger marker frequency disparities.

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