Spectral Profile Cues and Synthetic Listening

频谱轮廓提示和综合听力

基本信息

批准号：
7738918
负责人：
Emily Buss
金额：
$ 17.32万
依托单位：
UNIV OF NORTH CAROLINA CHAPEL HILL
依托单位国家：
美国
项目类别：
财政年份：
2005
资助国家：
美国
起止时间：
2005-12-15 至 2011-04-30
项目状态：
已结题

项目摘要

In recent years there has been a growing body of psychoacoustical evidence demonstrating that stimulus components falling outside of the frequency region of a signal can have a significant effect on the processing of that signal. In profile analysis and in comodulation masking release (CMR) that effect is to decrease thresholds: the presence of flanking stimulus components tends to improve sensitivity. In other phenomena, such as across channel masking, the effect of flanking components is to elevate thresholds. The goal of the current project is to de'velop a model of across-channel processing that captures both facilitation and interference effects. This model is based on the premise that the most ecologically relevant characteristic of an auditory object is its spectral content as a function of time, and that stimulus conditions associated with synthetic listening (e.g., common onset across frequency) can be understood in terms of the spectral profile, regardless of whether this type of processing is optimal. Further, it is proposed that a psychoacoustical phenomenon demonstrating across-channel processing with amplitude modulated stimulus components, such as CMR, can be understood in terms of short-term spectral cues. Experiments will use standard psychoacoustical methods with human observers to test qualitative predictions of this approach, using paradigms associated with both facilitation and interference. Results will be analyzed using standard parametric statistical techniques, primarily repeated measures ANOVA. Data from these as well as published studies will be modeled in order to obtain quantitative predictions for a range of phenomena involving across- frequency masking and masking release.

近年来，越来越多的心理声学证据表明，刺激落在信号频率区域之外的分量会对处理产生重大影响该信号的。在轮廓分析和共调制掩蔽释放 (CMR) 中，效果会降低阈值：侧翼刺激成分的存在往往会提高敏感性。在其他现象中，例如跨通道掩蔽，侧翼成分的作用是提高阈值。的目标当前的项目是开发一个跨渠道处理模型，该模型既能捕获便利性，又能捕获干扰效应。该模型基于以下前提：与生态最相关的特征听觉对象是其频谱内容作为时间的函数，并且与相关的刺激条件合成聆听（例如，跨频率的共同起始）可以根据频谱轮廓来理解，不管这种类型的处理是否是最佳的。此外，建议采用心理声学证明使用调幅刺激成分进行跨通道处理的现象，例如 CMR，可以用短期光谱线索来理解。实验将使用标准心理声学方法与人类观察者一起测试这种方法的定性预测，使用与促进和干扰相关的范式。结果将使用标准进行分析参数统计技术，主要是重复测量方差分析。来自这些以及已发布的数据研究将被建模，以获得涉及跨领域的一系列现象的定量预测频率掩蔽和掩蔽释放。