NORMAL & IMPAIRED TEMPORAL PROCESSING OF COMPLEX SOUNDS

普通的

基本信息

批准号：
6703115
负责人：
MARY S. FLORENTINE
金额：
$ 27.75万
依托单位：
NORTHEASTERN UNIVERSITY
依托单位国家：
美国
项目类别：
财政年份：
1995
资助国家：
美国
起止时间：
1995-02-01 至 2007-01-31
项目状态：
已结题

项目摘要

DESCRIPTION: (Adapted from the Investigator's Abstract) : The long-term objective of this proposal is to formulate precise, quantitative models for the perception of tones, noise, and speech in both normal and impaired hearing. Such models may aid in providing better diagnostic tools for hearing impairment and better rehabilitation of hearing-impaired listeners. The proposed project aims to investigate dynamic processes in the auditory system that affect the perception of loudness and roughness and to continue modeling of these processes. Model predictions will be compared to psychoacoustic data obtained in forced-choice experiments with cochlearly impaired listeners and with normal listeners tested in the quiet and with continuous maskers that are spectrally shaped to produce thresholds equal to those of an impaired listener. The specific aims encompass four areas. Specific aim 1 is to test several hypotheses related to the loudness ratio between equal-SPL long and short sounds. Binaural loudness summation for long and short tones will be measured as a function of level. A novel paradigm will be used to determine how loudness grows with stimulus duration by measuring the difference in duration required to produce equal loudness between equal-SPL monotic and diotic tones and between pure tones and tone and tone complexes. Specific aim 2 tests the hypotheses that intense 'recalibration' tones reduce the slope of normal listeners* loudness function for subsequent test tones at moderate levels and that recalibration is reduced or absent in impaired listeners, because it is mediated by efferent action on the outer hair cells. Loudness matches between tones at different frequencies will be obtained as a function of level with and without prior presentation of 85-dB-SPL recalibration tones. The effect of recalibration on temporal integration of loudness also will be examined. Specific aim 3 is to test the hypothesis that the form of the loudness function for a tone at low and moderate levels is approximately proportional to the square of the maximal basilar-membrane vibration amplitude. Growth of forward masking with on- and off-frequency maskers will be compared to loudness functions derived from measurements of binaural loudness summation and from measurements of temporal integration of loudness. Specific aim 4 is to test the hypothesis that loudness recalibration reduces roughness at moderate levels. Across-frequency roughness matches will be obtained as a function of level with and without recalibration.

描述：（改编自研究者摘要）：长期该提案的目标是为正常和听力受损的人对音调、噪音和言语的感知。这些模型可能有助于为听力障碍提供更好的诊断工具以及听力受损听众更好的康复。拟议项目旨在研究影响听觉系统的动态过程响度和粗糙度的感知并继续对这些进行建模流程。模型预测将与获得的心理声学数据进行比较在针对耳蜗受损听众和正常听众的强制选择实验中听众在安静的情况下进行测试，并使用连续的频谱掩蔽器形成与受损听众相同的阈值。具体目标包括四个领域。具体目标1是测试几个与等声压长和短声压级之间的响度比相关的假设声音。将测量长音和短音的双耳响度总和作为水平的函数。将使用一种新颖的范例来确定响度通过测量所需持续时间的差异，随着刺激持续时间的增加而增长在等声压级的单音和双音之间产生相等的响度纯音、音调和复合音之间。具体目标 2 测试假设强烈的“重新校准”音调会降低正常的斜率听众* 响度函数，用于中等级别的后续测试音调和受损听众的重新校准会减少或不存在，因为由外毛细胞的传出作用介导。之间的响度匹配不同频率的音调将作为电平的函数获得无需事先提供 85-dB-SPL 重新校准音。的效果还将检查响度时间积分的重新校准。具体目标 3 是检验响度函数形式的假设对于低和中等水平的音调大约与最大基底膜振动幅度的平方。前进的成长使用同频和非频率掩蔽器的掩蔽将与响度进行比较从双耳响度总和的测量得出的函数响度时间积分的测量。具体目标 4 是测试响度重新校准将粗糙度降低到中等水平的假设。跨频率粗糙度匹配将作为水平的函数获得并且无需重新校准。