HEARING LOSS AND THE PERCEPTION OF COMPLEX SOUNDS

感音神经性听力障碍的特征不仅在于 听觉灵敏度降低，但也会出现频率损失 选择性由于异常广泛的听觉过滤器在受损 耳蜗 这种赤字的可能功能后果 包括不能充分分析 复杂的声音，输出端的不利信噪比 的听觉过滤器，和异常的时间相互作用， 相邻的光谱成分。 这些因素可能会联合收割机， 干扰言语的理解，特别是在嘈杂的环境中， 环境. 这一系列实验的长期目标 是为了更全面地描述降低频率的特性 与不同程度的灵敏度损失相关的选择性， 与正常衰老过程的关系， 听觉滤波器带宽和识别能力之间， 区分宽带谐波复合。 频率选择性 将在听力受损的听众使用缺口评估 噪声掩蔽方法，以获得听觉的形状和带宽 filters. 内谱表示的测度 复杂的声音，识别谐波复合， 谐波分量间相位变化的判别 复合物将被评估的幅度方面， 滤波器带宽 此外，实验提出， 评估内部光谱建模的准确性 表示与频率选择性的措施，和 模拟听力损失的影响的价值 背景噪音

Sensorineural hearing impairment is characterized not only by a reduction in auditory sensitivity, but also by a loss in frequency selectivity due to abnormally wide auditory filters in the damaged cochlea. The possible functional consequences of such a deficit include an inability to adequately analyze the spectral detail of complex sounds, an unfavorable signal-to-noise ratio at the outputs of the auditory filters, and abnormal temporal interactions among adjacent spectral components. These factors may combine to interfere with the understanding of speech, particularly in noisy environments. The long-term goals of this series of experiments are to more fully describe the characteristics of reduced frequency selectivity associated with various degrees of sensitivity loss and with the normal aging process, and to assess the relationship between auditory filter bandwidths and the ability to identify and discriminate broadband harmonic complexes. Frequency selectivity will be assessed in hearing-impaired listeners using a notched noise masking method to derive the shape and bandwidths of auditory filters. Measures of the internal spectral representation of complex sounds, identification of harmonic complexes, and discrimination of phase changes among the components of harmonic complexes will be evaluated in terms of the magnitudes of the filter bandwidths. In addition, experiments are proposed which assess both the accuracy of modeling internal spectral representations with measures of frequency selectivity, and the value of simulating the effects of hearing impairment with background noise.