NORMAL & IMPAIRED TEMPORAL PROCESSING OF COMPLEX SOUNDS

普通的

• 批准号: 6628371
• 负责人: Soren Buus
• 金额: $ 30.16万
• 依托单位: NORTHEASTERN UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-02-01 至 2005-01-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6628371
• 关键词: adolescence (12-20); audiometry; auditory cortex; auditory discrimination; auditory stimulus; auditory threshold; behavioral /social science research tag; binaural hearing; clinical research; ear hair cell; efferent nerve; human subject; loudness; neural information processing; noise; perceptual maskings; psychoacoustics; psychometrics; sensorineural hearing loss; sound frequency; sound perception; vibration; young adult human (21-34); adolescence (12-20); audiometry; auditory cortex; auditory discrimination; auditory stimulus; auditory threshold; behavioral /social science research tag; binaural hearing; clinical research; ear hair cell; efferent nerve; human subject; loudness; neural information processing; noise; perceptual maskings; psychoacoustics; psychometrics; sensorineural hearing loss; sound frequency; sound perception; vibration; young adult human (21-34)

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：（根据调查员的摘要改编）：长期 该提案的目的是制定精确的定量模型 在正常和听力受损的情况下，对音调，噪音和语音的感知。 这样的模型可能有助于提供更好的听力障碍诊断工具 以及更好地康复听力受损的听众。拟议的项目 旨在研究影响影响的听觉系统中的动态过程 对响度和粗糙度的感知，并继续对这些响度进行建模 过程。将将模型预测与获得的心理声学数据进行比较 在强迫选择的实验中，听众受损，正常 听众在安静和连续的遮罩中进行了测试的听众 形状的产生阈值等于受损听众的阈值。 具体目标包括四个领域。特定目标1是测试几个 与等分长和短相之间的响度比相关的假设 听起来。将测量长音调的双耳响度总和 作为级别的函数。一种新颖的范式将用于确定响亮程度 通过测量所需持续时间的差异随刺激持续时间的生长 在相等的单体和diotic语调之间产生相等的响度， 在纯音，音调和音调之间。特定的目标2测试 假设强烈的“重新校准”音调降低了正常的斜率 听众*响度功能，用于随后的测试音调，以中等水平和 在听众受损的情况下，重新校准减少或不存在，因为它是 通过对外毛细胞的传出作用介导。响亮之间匹配 将在不同频率下以不同频率获得的音调和 没有事先介绍85-DB-SPL重新校准音调。效果 还将检查有关响度时间整合的重新校准。 特定目的3是检验响度功能形式的假设 对于低水平和中等水平的语气，与 最大基底膜振动幅度的平方。向前的增长 将屏蔽罩掩盖和频率掩蔽器将与响度进行比较 源自双耳响度求和的函数和 响度时间整合的测量。特定目标4是测试 假设响度重新校准可降低中等水平的粗糙度。 跨频粗糙度匹配将是作为级别的函数 并且没有重新校准。