ROLE OF TEMPORAL PROCESSING OF HARMONICITY IN SOURCE DETERMINATION

和谐性及其产生的时间规律性是可能的线索 用于声源测定。这种复杂的刺激往往会产生 对音高的感知。该项目解决了以下问题 对复杂声音（主要是波纹声音）的音调进行时间处理 噪音。波纹噪声产生复杂的音调感知，就像 由许多其他复杂刺激产生的那些。复杂的音高是其中之一 确定声源的可能提示。以前的人类心理物理学 工作表明，迭代波纹噪声的处理最好是 可以通过时间机制来解释，例如可以通过形式来揭示 自相关。因此，该项目的主要重点是时间 自相关等过程。该项目采用了多学科 基于人类心理物理学、动物心理物理学、动物心理物理学的方法 神经生理学和建模以深入了解时间 音高感知的机制。一系列人类心理社会 实验旨在确定自相关及其效果 神经模拟，汇总相关图，可以解释音高和音调 复杂声音的强度，例如重复的波纹噪声。在动物中 心理物理实验，龙猫的感知能力 用于处理人类使用的相同类型的波纹噪声刺激 将评估心理社会实验。目标之一是确定是否 负责人类复杂音调感知的机制 受试者对于人类神经系统来说是独特的或特殊的，或者是否 这些是哺乳动物中存在的常见神经机制。在 神经生理学实验，时间的神经表征 以及人类使用的相同波纹噪声的频谱特性 将探索龙猫的心理物理学实验。大部分的 生理工作将涉及对单个神经元的研究 龙猫耳蜗核。目标是了解信息如何 关于和声及其产生的时间规律性和音高是 在听觉系统中表示和处理。

Harmonicity and its resulting temporal regularity are cues that might be used for sound source determination. Such complex stimuli often generate the perception of pitch. This project addresses issues concerned with temporal processing of the pitch of complex sounds, primarily rippled noises. Rippled noise generates complex pitch perceptions, exactly like those produced by many other complex stimuli. Complex pitch is one possible cue for sound source determination. Previous human psychophysical work suggests that the processing of iterated rippled noise can best be explained by temporal mechanisms such as might be revealed by forms of auto-correlation. Thus, a major focus of this project is on temporal processes such as auto-correlation. This project uses a multi-disciplinary approach based on human psychophysics, animal psychophysics, animal neurophysiology, and modeling to gain insights into the temporal mechanisms underlying pitch perception. A series of human psychosocial experiments is designed to determine how well auto-correlation and its neural analog, summary correlograms, can account for the pitch and pitch strength of complex sounds such as iterated rippled noise. In the animal psychophysical experiments, the perceptual capabilities of the chinchilla for processing the same types of rippled noise stimuli used in human psychosocial experiments will be evaluated. One goal is to determine if the mechanisms responsible for the perception of complex pitch in human subjects are unique or special to the human nervous system or whether these are common neural mechanisms that exist across mammals. In neurophysiological experiments, the neural representations of the temporal and spectral characteristics of the same rippled noises used in the human and chinchilla psychophysical experiments will be explored. Most of the physiological work will involve studies of single neurons in the chinchilla cochlear nucleus. The goal is to understand how information about harmonicity and its resulting temporal regularity and pitch are represented and processed in the auditory system.