EFFECT OF COCHLEAR LOSS ON SPECTRO-TEMPORAL PATTERN A

我们的目的是为了更好地了解人工耳蜗的作用。 听力损失是指在噪声环境中听到信号的能力。的 特别令人感兴趣的是在波动的背景噪音中的听力。 最近的发现表明，正常的听觉系统会分析 在关键频带阵列中检测信号时的信息 背景起伏不定。这种类型的信号分析看起来 涉及频谱处理(跨临界频带)和时间处理。一 本项目的具体目标是确定是否 耳蜗病患者的频谱-颞叶功能受损 在波动噪声中进行处理。因为可以合理地假设 频谱-时间过程可能会因频率较低或时间较短而退化 分析，该项目的另一个具体目标是确定 广度异常的频谱-时间加工可能与更基本的 频率和/或时间分辨率受损。该项目还将 调查信号频率、波动频率、听力的影响 损失严重程度和听力损失斜率。所检查的刺激频率 将为0.5、1.0和2.0 kHz。所有的刺激都将以单声道方式传送， 通过耳机。这些任务将包括检测调制信号的方法 噪声作为调制频率和掩蔽器带宽的函数，以及 测量频率分辨率(陷波噪声法)和时间分辨率 分辨率(间隙检测)。测试将在经过声音处理的 房间里，采用了一种强制选择的适应性程序。主题将包括 听力正常对照组(n=12)，一组听力轻度到 中度、相对平坦的耳蜗性听力损失(n=25)， 有更严重耳蜗性听力损失的听者(n-12)，以及一组 有倾斜性听力损失(n-12)。数据将使用简单的 描述性统计、相关性和协方差分析。

Our aim is to obtain a better understanding of the effect of cochlear hearing loss on the ability to hear signals in a noise background. Of particular interest is hearing ability in fluctuating background noises. Recent findings suggest that the normal auditory system analyzes information across an array of critical bands when detecting signals in fluctuating backgrounds. This type of signal analysis would appear to involve both spectral (across critical band) and temporal processing. One specific aim of the present project is to determine whether cochlear-impaired listeners suffer impairment of the spectro-temporal process in fluctuating noise. Because it is reasonable to assume that the spectro-temporal process may be degraded by poor frequency or temporal analysis, another specific aim of the project is to determine to what extent abnormal spectro-temporal processing may be related to more basic impairments of frequency and/or temporal resolution. The project will also investigate the effects signal frequency, fluctuation frequency, hearing loss severity, and hearing loss slope. The stimulus frequencies examined will be 0.5, 1.0, and 2.0 kHz. All stimuli will be delivered monaurally, over earphone. The tasks will include measures of detection in modulated noise as a function of modulation frequency and masker bandwidth, and measures of both frequency resolution (notched noise method) and temporal resolution (gap detection). Testing will be performed in a sound-treated room, using a forced-choice adaptive procedures. Subjects will include a normal-hearing control group (n=12), a group of listeners having mild to moderate, relatively flat cochlear hearing loss (n=25), a group of listeners having a more severe cochlear hearing loss (n-12), and a group having sloping hearing loss (n-12). Data will be analyzed using simple descriptive statistics, correlation, and analysis of covariance.