AUDITORY IMPLANT PERCEPTION IN ONGOING BACKGROUNDS

多渠道人工耳蜗植入术在以下领域取得了显著成功 将语言交流的世界带给极度失聪的人。 然而，即使是最好的植入物用户也会体验到语音减少 在有背景噪音时的清晰度。这可能会使一个 普通的社交活动，如在餐厅用餐，变成一种 艰难的努力。我们的假设是噪音影响种植体 监听有两个方面：第一，它减小了动态范围和变化 音量增长功能；二是改变听者； 对时变刺激(如调制)的敏感度 对植入性聆听的心理物理学知之甚少 在嘈杂的背景下。这项研究的总体长期目标是 就是要深入了解这些背景的影响 浅谈多电极对简单声音和复杂声音的感知 植入病人。电子听力的两个基本方面是 本提案涉及的内容如下： 1.动态范围有限：植入听者的动态范围非常有限 范围从阈值到不舒服的响度级别(ULL)。我们预计 噪声背景会提高阈值并降低ULL值 语气(“招聘”)。然而，压缩动态的效果 响度函数形状的范围未知。实验1 将测量音调和AM信号的响度增长 存在宽带、带通和低通滤波噪声。 2.对幅度调制的敏感性：如光谱的程度 植入型监听者可用的细节尤其有限 对于正常的听力，对时间波动的敏感性可能会起到 在植入物的收益中起着重要的作用。实验二 将调查植入听者对幅度的敏感度 不同谱-时噪声下的调制 特点。 将在Nucleus和Clarion的用户中进行实验 系统。对于每个实验条件，不同程度的 信号和噪声之间的电极分离将用于 解决电极或通道相互作用的问题，第三 多电极听力中的重要因素。 希望这项研究能在今后的发展中发挥作用。 未来几代听觉植入式语音处理器和b) 提供对听觉感知的基本机制的洞察 在嘈杂声中。

Multi-channel cochlear implants have achieved phenomenal success in bringing the world of speech communication to the profoundly deaf. However, even the best implant users experience reduced speech intelligibility in the presence of background noise. This may turn an ordinary social activity such as dining at a restaurant, into a difficult endeavor. Our Hypothesis is that noise influences implant listening in two ways: first, it reduces the dynamic range and changes the loudness growth function and second, it changes the listeners; sensitivity to time-varying aspects of stimuli (such as modulation) Relatively little is known about the psychophysics of implant listening in noisy backgrounds. The overall long-term objective of this research is to achieve in-depth understanding of the effects of such backgrounds on the perception of simple and complex sounds in multi-electrode implant patients. Two fundamental aspects of electrical hearing are addressed in this proposal: 1. Limited dynamic range: Implant listeners have a very limited dynamic range from threshold to uncomfortable loudness level (ULL). We expect that a noise background will raise the threshold and lower the ULL of the tone ("recruitment"). However, the effect of the compressed dynamic range on the shape of the loudness function is unknown. Experiment 1 will measure loudness growth of both tones and AM signals in the presence of wideband, bandpass and lowpass filtered noise. 2.Sensitivity to amplitude modulations: As the degree of spectral detail available to implant listeners is particularly limited compared to normal hearing, sensitivity to temporal fluctuations may play an important role in the benefit derived from the implant. Experiment 2 will investigate the sensitivity of implant listeners to amplitude modulation in the presence of noise with different spectro-temporal characteristics. Experiments will be performed in users of both Nucleus and Clarion systems. For each experimental condition, different degrees of electrode separation between signal and noise will be used in order to address the issue of electrode- or channel- interaction, a third important factor in multi-electrode hearing. It is expected that this research will a) play a role in the development of future generations of auditory implant speech processors and b) provide insight into the fundamental mechanisms of auditory perception in noise.