BINAURAL INFORMATION PROCESSING

双耳信息处理

• 批准号: 3461607
• 负责人: LESLIE BERNSTEIN
• 金额: $ 8.88万
• 依托单位: UNIVERSITY OF CONNECTICUT SCH OF MED/DNT
• 依托单位国家: 美国
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-08-01 至 1994-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/3461607
• 关键词: auditory discrimination; auditory stimulus; binaural hearing; human subject; neural information processing; noise; sound frequency

The purpose of the proposed research is to gain a broader understanding of the manner in which interaural temporal disparities (ITD's) and interaural intensitive disparities (IID's) ar processed within high- frequency, complex waveforms. One subset of experiments concerns the evaluation of the degree to which ITD's and/or IID's account for the rather large release from masking which can be obtained when dichotic as compared to diotic signals are employed (the high-frequency MLD). "Natural" as well as specially constructed digital stimuli will be employed which will allow for the variation and measurement of the interaural parameters in a controlled and predictable fashion. In addition, listeners' absolute sensitivities to the presence of such cues within high-frequency, complex waveforms will be measured. A second subset of experiments involves a parametric investigation of the conditions under which listeners' use of interaural disparities within a (target) stimulus at one spectral locus is affected by the presence of (interfering) stimuli at different spectral loci. The manner in which these interfering stimuli affect the lateral position (measured via an acoustic "pointing" task) of the target, sensitivity to the presence of interaural disparities within the target and detection of targets within a background of noise (the MLD) will be investigated. A third subset of experiments will assess to what degree processing of ITD's within the envelopes of high-frequency stimuli is analogous to the processing of ITD's within the fine-structure of low-frequency stimuli. Detection of ITD's and extent of laterality will be measured for bands of noise and sinusoidally amplitude modulated tones (SAM) with center frequencies between 4 kHz and 15 kHz. In addition, an investigation of the conditions under which an envelope-based "binaural beat" occurs with SAM tones and two-tone complexes will be conducted.

拟议研究的目的是为了获得更广泛的了解。 耳间时间差异(ITD‘s)和 耳间强化差异(IID‘s)是在高噪声条件下处理的 频率，复杂的波形。 实验的一个子集涉及对以下方面的程度的评估 ITD和/或IID的帐户导致相当大的泄漏 与双眼信号相比，当双眼信号被 使用(高频MLD)。“自然”和“特别” 将使用构建的数字刺激，这将允许 受试者耳间参数的变化及测量 和可预测的时尚。此外，听众的绝对敏感度 在高频、复杂的波形中存在这样的提示 将会被测量。 实验的第二个子集涉及参数调查 听者使用耳间差异的条件 在一个光谱轨迹处的(目标)刺激内受 在不同光谱位置存在(干扰)刺激。这个 这些干扰刺激影响横向位置的方式 (通过声学“指向”任务测量)目标的灵敏度 目标和检测中存在耳间视差 将对噪声背景中的目标(MLD)进行调查。 第三个实验子集将评估处理到什么程度 高频刺激包络内的ITD类似于 在低频刺激的精细结构内对ITD进行加工。 对于波段，将测量ITD的检测和偏侧程度 带中心的噪声和正弦调幅音调(SAM) 频率在4千赫到15千赫之间。此外，一项关于 出现基于包络的“双耳节拍”的条件是 将进行SAM音调和双音复调。