EFFECT OF COCHLEAR LOSS ON SPECTRO-TEMPORAL PATTERN A

我们的目的是为了更好地了解耳蜗的作用， 听力损失对在噪声背景中听到信号的能力的影响。 的 特别感兴趣的是在波动背景噪声中的听觉能力。 最近的研究结果表明，正常的听觉系统分析 当检测信号时， 起伏不定的背景 这种类型的信号分析似乎 涉及频谱（跨临界频带）和时间处理。 一 本项目的具体目标是确定是否 耳蜗受损的听众遭受频谱-时间的损害， 在起伏的噪音中。 因为有理由假设， 频谱-时间处理可能由于差频率或时间 分析，该项目的另一个具体目标是确定 频谱-时间处理异常的程度可能与更基本的 频率和/或时间分辨率的损害。 该项目还将 研究信号频率、波动频率、听力 听力损失严重程度和听力损失斜率。 检查的刺激频率 将为0.5、1.0和2.0 kHz。 所有的刺激都是单耳传递的， 通过耳机。 这些任务将包括检测调制的 作为调制频率和掩蔽带宽的函数的噪声，以及 测量频率分辨率（陷波噪声方法）和时间 分辨率（间隙检测）。 测试将在经过声音处理的 房间，采用了强制选择自适应程序。 受试者将包括 正常听力对照组（n = 12），一组听力正常的人， 中度，相对平坦的耳蜗听力损失（n = 25），一组 具有更严重的耳蜗听力损失的听众（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.