Within and Between Channel Representation

描述（由申请人提供）：该提议构成了心理物理实验程序，其检查健康人类听觉系统中听觉处理的两个方面：（a）跨频率的信息的不确定性驱动的整合，以及（B）观察者检测和/或分离嵌入在干扰物背景中的目标信号的能力。所提出的实验分别检查跨频率的信息整合和跨时间和频率的信息整合。第一系列实验的主要目标是比较刺激不确定性的影响，使用任务，观察者应该从一个单一的频率轨迹提取频率与比较整个频谱的信息。对于前一项任务，有人建议，观察员未能有选择地参加一个单一的频率轨迹，一个解释，这是很难调和的不确定性影响后一项任务。第二组研究提供了估计的相对功效不同的线索声源隔离。实验研究的假设，多个线索是独立的代表和最佳组合。此外，实验估计频率选择性分离后的两个来源到“听觉流”。“拟议的实验通过分析阈值数据并检查时间和频率的相对权重来解决这些问题。与信号检测理论相关的处理模型形成了数据分析的基础。虽然实验观察者是具有正常听力图的大学生，但实验方法可用于测试患有听力障碍的人，对这些人来说，多个源的存在导致大量掩蔽。

DESCRIPTION (provided by applicant): This proposal constitutes a psychophysical experimental program which examines two aspects of auditory processing in the healthy human auditory system: (a) uncertainty-driven integration of information across frequency, and (b) observers' ability to detect and/or segregate target signals embedded in a background of distracters. The proposed experiments examine the integration of information across frequency and the integration of information across time and frequency, respectively. The primary goal of the first sequence of experiments is to compare effects of stimulus uncertainty using tasks in which observers should extract frequency from a single frequency locus vs. compare information across the spectrum. For the former task it has been suggested that observers fail to selectively attend to a single frequency locus, an explanation that is difficult to reconcile with uncertainty effects for the latter task. The second set of studies provides estimates of the relative efficacy of different cues for sound source segregation. The experiments examine the hypothesis that the multiple cues are independently represented and optimally combined. In addition, the experiments estimate frequency selectivity after the segregation of two sources into "auditory streams." The proposed experiments address these issues by analyzing threshold data and examining relative weights in time and frequency. Processing models associated with signal detection theory form the basis of data analysis. While the experimental observers are undergraduates with normal audiograms, the experimental methods can be adopted to test persons suffering hearing impairment, persons for whom the presence of multiple sources leads to substantial masking.