BINAURAL INFORMATION PROCESSING

双耳信息处理

• 批准号: 3461608
• 负责人: LESLIE BERNSTEIN
• 金额: $ 10.06万
• 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/3461608
• 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.

建议研究的目的是为了获得更广泛的理解 耳间时间差异（ITD）和 耳间强度差异（IID）在高- 频率，复杂的波形 实验的一个子集涉及评估的程度， ITD和/或IID占掩蔽的相当大的释放 这可以在与双耳信号相比双耳信号被 使用（高频MLD）。 “自然”和“特别” 将采用构造的数字刺激，这将允许 在一个受控的耳内参数的变化和测量 可预测的时尚。 此外，听众的绝对敏感度 在高频复杂波形中存在这样的线索 将被衡量。 实验的第二个子集涉及以下参数的研究： 在何种条件下，听众使用的两耳间差异， 在一个光谱位点处的（目标）刺激内的受 在不同光谱位点存在（干扰）刺激。 的 这些干扰刺激影响侧位的方式 （通过声学“指向”任务测量）的目标，灵敏度， 目标和检测中存在耳间差异 将研究噪声背景（MLD）中的目标。 第三组实验将评估在何种程度上处理 高频刺激包络内的ITD类似于 低频刺激精细结构内ITD的处理。 将测量条带的ITD检测和偏侧程度 噪声和正弦幅度调制音（SAM）的中心 频率在4 kHz到15 kHz之间。 此外，对 基于双声道的“双耳节拍”发生的条件， 将进行SAM音调和双音调复合。