INTENSITY CODING AND DYNAMIC PROCESSES IN HEARING

听觉系统跟踪和分辨声音变化的能力 声音的振幅和频率对听觉至关重要。 感知和沟通。本提案侧重于幅度变化 是一项综合性的心理物理学研究， 从声音振幅的变化中提取信息。拟议 项目关注的是这种动态的日益复杂的方面， 处理.这些项目的目标是：（1）了解如何 幅度变化被辨别和编码，以及这种辨别是如何 涉及检测由以下因素产生的连续幅度变化 正弦幅度调制;（2）解决 听觉频率分析和频谱频率区域如何确定和 影响幅度变化的时间处理;（3）确定和 描述检测某些振幅周期性的能力是如何 受其他周期性存在的影响;（4）描述 跨通道时间分辨率，特别是解决 在不同频率区域中发生的幅度变化的差异 （5）评估听觉频率 选择性在刺激过程中“锐化”， 并且理论上，这种动态过滤对于动态 处理. 该项目将提供具有根本重要性的信息， 描述和理解正常人听觉的动态特性 并最终理解听力障碍的后果 这些财产。该项目将为以下方面提供规范性数据： 评估听力障碍对动态过程的影响， 一般情况下，将提供一个动态处理的设计依据 例如助听器和人工耳蜗植入物等假体装置中的方案。

The ability of the auditory system to follow and to resolve changes in the amplitude and frequency of sound is of crucial importance for auditory perception and communication. This proposal focusses on amplitude changes and is a comprehensive psychophysical study of the ability to resolve and to extract information from changes in the amplitude of sound. The proposed projects are concerned with increasingly complex aspects of such dynamic processing. The objectives of these projects are: (1) to understand how amplitude changes are discriminated and coded, and how such discrimination relates to the detection of continuous amplitude changes produced by sinusoidal amplitude modulation; (2) to address fundamental questions of how auditory frequency analysis and spectral frequency region determine and affect temporal processing of amplitude changes; (3) to determine and describe how the ability to detect certain amplitude periodicities is affected by the presence of other periodicities; (4) to describe cross-channel temporal resolution, specifically, the ability to resolve differences in amplitude changes that occur in different frequency regions or channels; (5) to evaluate the hypothesis that auditory frequency selectivity 'sharpens' during stimulation and to pursue both experimentally and theoretically the implications of such dynamic filtering for dynamic processing. This project will provide information of fundamental importance for describing and understanding the dynamic properties of normal human hearing and, eventually, for understanding the consequences of hearing impairment on these properties. This project will provide normative data for evaluating the effects of hearing impairment on dynamic processes and, more generally, will provide a basis for the design of dynamic processing schemes in prosthetic devices such as hearing aids and cochlear implants.