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: 3218125
• 负责人: John H Grose
• 金额: $ 11.19万
• 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/3218125
• 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 对声源分离过程的理解 正常听觉系统与耳蜗术后听力障碍的关系 流程。这将特别有助于实现一个目标 理解有耳蜗者所经历的困难 竞争性听力情况下的听力损失。四个研究领域 都被提出了。第一个领域涉及信息以何种方式 关于频谱分散的信号被跨频率组合以 提高检测能力。有趣的是在以下情况下的比较 信号由频率和频率上的能量增量组成 信号由能量的减少组成的情况 频率第二个研究领域涉及的情况是 复杂信号必须从包含多个 调制模式。其目的是确定在多大程度上 听觉系统可以实现并发的跨频率处理 提取复数信号并确定 频率和时间分辨率对这一能力的损害。这个 第三个研究领域考察了以下指标之间的对应关系 跨频处理和听觉分组。一系列 实验评估了共调掩蔽释放的敏感性 (CMR)和调制检测干扰(MDI) 听觉群体的形成。第二个调查实施了 CMR范式提供了一种客观衡量 所谓的听觉分组因素。第四个研究领域量化 耳蜗病患者的分离能力 同时-呈现声音，并分离(或流) 顺序-呈现声音。最重要的是两国之间的关系 在这些能力和频率选择性和 相同听众的时间分辨率。总共15个 耳蜗病患者和12名听力正常的对照组 听众的招募将使用严格的年龄和听力标准。 测试将在耳机下的声音处理室进行，使用 计算机控制的自适应程序。数据将使用以下工具进行分析 简单的描述性统计、相关性和方差分析。