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: 3216033
• 负责人: MARY S. FLORENTINE
• 金额: $ 23.44万
• 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 1995-11-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/3216033
• 关键词: auditory discrimination; auditory feedback; auditory pathways; auditory stimulus; auditory threshold; cochlear lesion; cues; disease /disorder model; hearing disorders; hearing tests; human subject; loudness; model design /development; neural information processing; noise; perceptual maskings; psychoacoustics; psychometrics; sound frequency; speech

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 multi-band 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. Our specific aims are: (1) to test the hypothesis that excitation-level Information decreases over time due to adaptation processes in the auditory system, intensity DLs for multiple tone bursts will be measured as functions of the number of bursts and the interburst interval. In other experiments, intensity DLs for brief tones will be measured in the presence of a preceding, adapting tone of various durations; (2) to provide a direct test of the hypothesis that Comodulation Masking Release, CMR, results from "listening in the valleys" and can be explained by an energy-detector model with a stimulus-driven, time-varying weighting of the signal channel, Conditional-On-a-Single-Stimulus (COSS) detection-probability functions will be measured for stimuli presented in multi-band maskers with coherent envelopes (which produce CMR) and with incoherent envelopes (which do not produce CMR); (3) to test the hypothesis that stimulus-driven, time-varying weights affect temporal integration for detection of a tone masked by noise, thresholds for tones presented in gated and continuous maskers with and without cue tones will be measured as a function of signal duration; (4) to assess how stimulus parameters govern the channel weights, thresholds for brief tones presented in gated maskers of various bandwidths will be measured as a function of a cue tone's level and duration; (5) to test the hypothesis that stimulus-driven, time-varying weights cause across-frequency integration to depend on signal duration and listening condition, thresholds for multi-tone complexes of various bandwidths will be measured as functions of stimulus duration and listening condition (gated versus continuous masker, signal bandwidth fixed or randomized across trials, and cue present or absent); (6) to test the hypothesis that widened attention bands obtained in gated maskers reflect the operation of stimulus-driven, time-varying weights, measurements on how attention bandwidth is affected by presentation of a cue prior to each signal interval will be obtained as functions of the masker's off-time and the masker-signal onset separation. 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.

我们的长期目标是了解听觉系统 这将允许对音调感知的定量建模，噪声， 和言语在正常和听力受损中。 这样的模型很重要 了解正常的听觉过程并为 改善听力受听众的诊断和康复。 这 拟议的项目旨在获取精神声音数据，这将允许进一​​步 对激发模式和多频段决策规则的概念的测试 可以为正常和 听力受损。 基于正常，受损的21,2AFC实验， 拟议的项目将建立牢固的基础 用于完善我们的激发图案强度歧视模型和 在此测试许多与决策过程有关的假设 其他型号。 我们的具体目的是：（1）检验以下假设。 兴奋级信息随着时间的推移而降低 听觉系统中的过程，多音突发的强度DLS 将测量爆发数量和爆发的功能 间隔。 在其他实验中，简短音调的强度DLS将是 在存在各种的先前的调整音调的情况下测量 持续时间； （2）直接检验综合假设 掩盖发行版CMR是“在山谷中聆听”的结果，可以是 用具有刺激驱动的，随时间变化的能量检测器模型解释 信号通道的加权，有条件的刺激性刺激（COSS） 将测量检测验证功能的刺激 具有连贯信封（产生CMR）的多频掩蔽器，并带有 不连贯的信封（不产生CMR）； （3）检验假设 刺激驱动的，随时间变化的权重影响时间整合 检测被噪音掩盖的音调，在 带有和不带有提示色调的封闭式和连续的掩蔽器将被测量 信号持续时间的函数； （4）评估刺激参数如何控制 通道的重量，在封闭式掩蔽中呈现的简短音调的阈值 各种带宽将作为提示音级的函数测量 和持续时间； （5）检验刺激驱动的时变的假设 权重导致跨频整合取决于信号持续时间和 聆听条件，各种多音调复合物的阈值 带宽将作为刺激持续时间和聆听的功能进行测量 条件（门控与连续掩蔽器，信号带宽固定或 在试验中随机分组，提示存在或不存在）； （6）测试 假设在封闭式掩蔽器中获得的加宽注意带反射 刺激驱动的，随时间变化的权重的操作，测量如何 注意带宽会受到每次提示的提示的影响 信号间隔将作为掩盖器的停机时间的功能获得 掩蔽信号的开始分离。这些数据将大大增加 我们对正常和听力受损的理解，对 听觉系统模型的开发和测试。