COMPLEX SOUND ANALYSIS IN NORMAL AND IMPAIRED LISTENERS

正常和受损听众的复杂声音分析

• 批准号: 2126535
• 负责人: John H Grose
• 金额: $ 11.08万
• 依托单位: UNIV OF NORTH CAROLINA CHAPEL HILL
• 依托单位国家: 美国
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-12-01 至 1996-11-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/2126535
• 关键词: audiometry; auditory discrimination; auditory stimulus; auditory threshold; hearing; human subject; musics; neural information processing; noise; perceptual maskings; sensorineural hearing loss; sensory signal detection; sequential perception; sound frequency

The long-term objective of this project is to provide a better understanding of the processes underlying sound source segregation in the normal auditory system and the effects of cochlear dysfunction on those processes. This will contribute, in particular, to an objective appreciation of the difficulties experienced by listeners with cochlear hearing loss in competitive listening situations. Four areas of study are proposed. The first area deals with the manner in which information concerning a spectrally-dispersed signal is combined across frequency to improve detection. Of interest is a comparison between conditions where the signal consists of an increment in energy across frequency and conditions where the signal consists of a decrement in energy across frequency. The second area of study is concerned with situations where a complex signal must be extracted from a background containing multiple modulation patterns. The aim is to determine the degree to which the auditory system can implement concurrent across-frequency processes to extract the complex signal and to ascertain the limitations imposed by impairments of frequency and temporal resolution on this ability. The third area of study examines the correspondence between measures of across-frequency processing and auditory grouping. One series of experiments assesses the susceptibility of comodulation masking release (CMR) and modulation detection interference (MDI) to factors which oppose the formation of auditory groupings. A second investigation implements a CMR paradigm to provide an objective measure of the fusion strength of purported auditory grouping factors. The fourth area of study quantifies the ability of cochlear-impaired listeners to segregate simultaneously-present sounds, and to segregate (or stream) sequentially-present sounds. Of primary interest is the relationship between these abilities and the functions of frequency selectivity and temporal resolution in the same listeners. A total of 15 cochlear-impaired listeners and a control group of 12 normally-hearing listeners will be recruited using strict age and audiometric criteria. Testing will take place in a sound-treated room under headphones using computer-controlled adaptive procedures. Data will be analyzed using simple descriptive statistics, correlations, and analyses of variance.

该项目的长期目标是提供更好的 了解声音源隔离的过程中的过程 正常的听觉系统以及耳蜗功能障碍对这些功能的影响 过程。 这将特别有助于目标 欣赏人工耳蜗遇到的困难 竞争性听力情况下的听力损失。 四个学习领域 提出了。 第一个领域涉及信息的方式 关于频谱分散信号的频率合并 改善检测。 有趣的是条件之间的比较 信号包括跨频率和 信号由跨跨能量组成的条件 频率。 研究领域与一个情况有关 必须从包含多个背景的背景中提取复杂信号 调制模式。 目的是确定 听觉系统可以实施并发的跨频过程 提取复杂信号并确定由 在此能力上的频率和时间分辨率的障碍。 这 研究领域研究了措施之间的对应关系 跨频处理和听觉分组。 一个系列 实验评估了重掩模释放的敏感性 （CMR）和调制检测干扰（MDI） 听觉分组的形成。 第二次调查实施 CMR范式提供了客观的融合强度衡量 声称的听觉分组因素。 研究的第四领域量化 耳蜗受损的听众隔离的能力 同时出现的声音，并分离（或流） 依次存在的声音。 主要感兴趣的是关系 在这些能力和频率选择性的功能和 同一听众的时间分辨率。 总共15 耳蜗受损的听众和一个通常听证的对照组 听众将使用严格的年龄和听力标准招募。 测试将在耳机下的声音处理的房间中进行 计算机控制的自适应过程。 数据将使用 简单的描述性统计，相关性和方差分析。