PROCESSING HARMONICITY AND INTENSITY OF COMPLEX AUDITORY SIGNALS

从复杂声源中形成听觉图像是一种 人类听觉系统的重要功能。 几个物理 复杂声音的特性已经被描述为对于 听觉图像的形成。 在这个项目中，我们描述 实验旨在了解 协调性和强度。 强度可以 指的是刺激的整体声级，也可以指 刺激的强度分布。 和谐性与 音高知觉是一种重要的知觉， 声音，包括语音和音乐。 我们将特别关注 与和声性相关的刺激特征的听觉处理， 不同类型噪声信号的强度，特别是波纹 噪声和带限噪声。 波纹噪音产生的感觉， 音调，并且可以是宽带或带限信号。 拟议的实验涉及人类心理物理学和计算机 模拟、动物行为和单神经元记录。 人 心理物理学实验，我们将继续定义感官和 听觉系统处理频谱的感知能力 纹波刺激，包括迭代纹波噪声和对数纹波 刺激。 这些研究还将包括使用脉冲的模拟- Roy Patterson的丝带模型 在动物实验中，我们将研究 使用正强化处理栗鼠中的波纹噪声， 心理物理学的程序，这将使我们能够定义感官 这种动物处理波纹噪音刺激的能力。 作为 作为这项工作的一部分，我们还将研究龙猫的能力， 检测带限噪声的强度增量。 最后，我们将研究 时间和频谱特征的神经表征 的放电模式中的波纹噪声和带限噪声， 灰鼠耳蜗核中的神经元。 这些研究将使我们 将龙猫的心理物理实验结果与 灰鼠耳蜗核神经元反应及对人 心理物理数据 这些实验将提供重要的见解 复杂声音的和谐度和强度的神经处理 在人类身上。

The formation of auditory images from complex sound sources is an important function of the human auditory system. Several physical characteristics of complex sounds have been described to be important for the formation of auditory images. In this project, we describe experiments directed at gaining an understanding of the role of harmonicity and intensity in auditory image formation. Intensity can refer to the overall sound level of a stimulus or it may refer to the intensity profile of a stimulus. Harmonicity is closely related to the perception of pitch which is an important perception of many complex sounds, including speech and music. We will specifically focus on the auditory processing of stimulus features related to harmonicity and intensity of different types of noise signals, particularly rippled noises and bandlimited noises. Rippled noises produce the perception of pitch in humans and can be broadband or bandlimited signals. The proposed experiments involve human psychophysics and computer simulations, animal behavior, and single neuron recording. In human psychophysical experiments, we will continue to define the sensory and perceptual capabilities of the auditory system for processing spectrally rippled stimuli, including iterated-rippled noises and log-rippled stimuli. These studies will also include simulations using the Pulse- Ribbon Model of Roy Patterson. In animal experiments, we will study rippled noise processing in the chinchilla using positive reinforcement, psychophysical procedures which will allow us to define the sensory capabilities of this animal for processing rippled noise stimuli. As part of this effort, we will also study the ability of the chinchilla to detect intensity increments of bandlimited noise. Finally, we will study the neural representations of the temporal and spectral characteristics of rippled noises and bandlimited noises in the discharge patterns of neurons in the chinchilla cochlear nucleus. These studies will allow us to compare the results from the chinchilla psychophysical experiments to neuronal responses in the chinchilla cochlear nucleus and to human psychophysical data. These experiments will provide important insights into the neural processing of harmonicity and intensity of complex sounds in humans.