INTENSITY DLS AND MASKING IN NORMAL AND IMPAIRED HEARING

我们的长期目标是了解听觉系统 这将允许对音调、噪声、 在听力正常和受损的情况下都能说话。这样的模式很重要 以了解正常的听觉过程，并为 改进听障患者的诊断和康复。这个 拟议的项目旨在获得心理声学数据，以便进一步 激励模式和多带决策规则概念的检验 可以提供一个通用的框架，用于对正常和 听力受损。基于21，2AFC实验，在正常、受损和 蒙面-正常的听众，拟议的项目将建立坚实的基础 为了完善我们的强度歧视的激发模式模型 测试与决策过程相关的一些假设 其他型号。我们的具体目标是：(1)检验假设 由于适应，激发电平信息随时间而减少 听觉系统中的过程，多音突发的强度DLS 将作为脉冲串数量和脉冲串间隔的函数进行测量 时间间隔。在其他实验中，短音调的强度DLS将为 在存在各种不同的前面的、适应的语气的情况下测量的 持续时间；(2)提供对解调假设的直接测试 掩蔽释放，CMR，由“在山谷中倾听”产生，并且可以 由能量探测器模型解释，该模型具有刺激驱动的、时变的 信号通道加权，单刺激条件(COSS) 检测概率函数将被测量给出的刺激 具有相干包络的多波段掩码(产生CMR)和 非相干包络(不产生CMR)；(3)检验假设 刺激驱动的、随时间变化的权重会影响 检测被噪声掩蔽的音调，中显示的音调阈值 具有和不具有提示音调的门控和连续掩码将被测量为 信号持续时间的函数；(4)评估刺激参数如何控制 门控屏蔽器中呈现的短音的通道权重、阈值 将根据提示音的级别来测量各种带宽的大小 和持续时间；(5)检验刺激驱动、时变的假设 权重导致跨频率积分取决于信号持续时间和 不同类型的多音复合体的收听条件、阈值 带宽将作为刺激持续时间和听力的函数进行测量 状态(门控屏蔽与连续屏蔽、信号带宽固定或 在所有试验中随机进行，并且提示存在或不存在)；(6)测试 在门控掩蔽者中获得的拓宽注意带的假说反映了 刺激驱动的操作，时变权重，如何测量 注意带宽受提示出现在每个提示之前的影响 信号间隔将作为屏蔽器的关闭时间和 掩蔽器-信号起始点分离。这些数据将显著增加 我们对听力正常和受损的理解将对 听觉系统模型的开发和测试。

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.