INTENSITY DLS AND MASKING IN NORMAL AND IMPAIRED HEARING

正常和听力受损的强度 DLS 和掩蔽

• 批准号: 6124949
• 负责人: MARY S. FLORENTINE
• 金额: $ 28.8万
• 依托单位: NORTHEASTERN UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 1983
• 资助国家: 美国
• 起止时间: 1983-12-01 至 2002-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6124949
• 关键词: acoustic nerve; auditory discrimination; auditory feedback; auditory pathways; auditory stimulus; auditory threshold; behavioral /social science research tag; clinical research; hearing tests; human subject; mathematical model; model design /development; neural information processing; perceptual maskings; psychoacoustics; psychometrics; sensorineural hearing loss; sound frequency

Our long-term objective is to reach an understanding of the auditory system that will allow quantitative modeling of the perception of tones, noise, and speech in both normal and impaired hearing. Such models are important for understanding normal auditory processes and provide a basis for improving diagnosis and rehabilitation of hearing-impaired listeners. The proposed project aims to obtain psychoacoustic data that will allow further tests of the concept that excitation patterns and multiband decision rules may provide a general framework for quantitative modeling of normal and impaired hearing. Based on 21,2AFC experiments in normal, impaired, and masked-normal listeners, the proposed project will establish a firm basis for refining our excitation-pattern model of intensity discrimination and testing a number of hypotheses related to the decision process In this and other models. The specific aims are: (1) To test the hypothesis that differences in across-frequency integration for detection of brief and long tone complexes reflect different psychometric functions, psychometric functions will be measured for detection of masked brief and long tones and tone complexes. (2) To test the hypothesis that lower-than-expected thresholds for brief tone complexes depends on synchronous activity across a number of channels, masked thresholds will be measured for brief tone bursts and tone complex with the component tones in various phase relationships at the envelope peak. (3) To test the hypothesis that phase-locking of the auditory nerve may aid detection of tones with long durations, thresholds in the quiet and under masking will be compared for long and short bursts of tones and frozen narrow-band noises at several frequencies. (4) To test the hypothesis that the effect of duration on level discrimination depends on the width of the excitation pattern, level discrimination thresholds will be measured for tones and tone complexes partially masked by notched-noise maskers. (5) To test the hypothesis, that detection of masked signals is based on activity in an optimum selection of equally weighted frequency-selective channels, detection-probability functions (Conditional On a Single Stimulus, COSS) will be measured for pure tones and an 18-tone complex in either fixed or random conditions. The signals will be masked by uniformly masking noise composed of 24 critical-band wide noises whose levels vary randomly. The conditional psychometric functions thus obtained provide direct estimates of the decision rules used for each signal and listening condition. (6) To test the hypothesis that listeners' decision in a level-discrimination experiment is based on an optimally weighted sum of across-interval excitation-level differences in frequency selective channels, COSS functions will be measured for level discrimination of multitone complexes in which a random jitter is applied to each component. These data will add significantly to our understanding of normal and impaired hearing and will be important for the development and testing of models of the auditory system. Little is known about how the auditory system integrates information across channels, although this ability is critical to our perception of almost all sounds.

我们的长期目标是了解听觉 系统将允许对音调感知的定量建模， 噪音和言语在正常和听力受损中。这样的模型是 对于理解正常的听觉过程和提供基础很重要 用于改善听力受损的听众的诊断和康复。 拟议的项目旨在获取精神声音数据，以 进一步测试激发模式和多频道的概念 决策规则可以为定量建模提供一般框架 正常听力受损。基于正常的21,2AFC实验 拟议的项目将受到损害和掩盖正常的听众，将 建立一个牢固的基础来完善我们的激发模式 强度歧视和检验许多与 该模型和其他模型中的决策过程。具体目的是：（1） 测试跨频整合差异的假设 用于检测简短和长音的复合体反映不同的 心理测量功能，心理测量功能将被衡量 检测蒙面的简短色调和音调复合体。 （2）测试 简短音调低于预期的阈值的假设 复合物取决于多个通道的同步活动， 将测量蒙版的阈值，以进行简短的音调爆发和音调复杂 在信封处的各个阶段关系中的分量色调 顶峰。 （3）检验听觉神经相锁定的假设 可以帮助检测长时间长时间的音调，安静的阈值 在掩蔽下将进行长时间和短爆发的音调和 几个频率的冷冻窄带噪声。 （4）测试 假设持续时间对级别歧视的影响取决于 在激发模式的宽度上，水平歧视阈值 将测量以部分掩盖的色调和音调复合体 缺口掩护者。 （5）检验假设的检测 蒙版信号基于活动，以同样选择的最佳选择 加权频率选择通道，检测验证功能 （以单个刺激为条件，COSS）将用于纯色调 以及在固定或随机条件下的18色调复合物。信号 将通过均匀掩盖的噪声掩盖，由24个临界带组成 其水平随机变化的巨大噪音。有条件的心理测量学 因此获得的功能提供了对决策规则的直接估计 用于每个信号和听力条件。 （6）检验假设 听众在级别的歧视实验中的决定是基于的 以最佳的加权总和的跨性别激发级别的总和 频率选择性通道的差异，COSS功能将是 测量了多音节复合物的水平歧视，其中a 随机抖动应用于每个组件。这些数据将添加 重要的是我们对正常听力和受损的理解以及 对于开发和测试模型将很重要 听觉系统。关于听觉系统如何集成的知之甚少 信息遍历 渠道，尽管这种能力几乎对我们的看法至关重要 所有声音。