ROLE OF TEMPORAL PROCESSING OF HARMONICITY IN SOURCE DETERMINATION

和谐性及其产生的时间规律性可能是 用于声源确定。这种复杂的刺激通常会产生 对音高的感知该项目涉及以下问题： 对复杂声音的音高的时间处理，主要是波纹 噪音波纹噪声产生复杂的音高感知，就像 由许多其他复杂的刺激产生的。复音高是一种 确定声源的可能线索。人类心理物理学 工作表明，迭代波纹噪声的处理可以最好地 可以用时间机制来解释，比如可以用 自相关因此，该项目的一个主要重点是时间 自相关等过程。该项目采用多学科 方法基于人类心理物理学，动物心理物理学，动物 神经生理学和建模，以深入了解时间 音高感知的潜在机制一系列的人类社会心理 实验的目的是确定如何以及自相关和其 神经模拟，总结相关图，可以解释音高和音高 复杂声音的强度，如重复的波纹噪声。在动物 心理物理学实验，栗鼠的感知能力 用于处理与人类中使用的相同类型的波纹噪声刺激 将对心理社会实验进行评估。一个目标是确定 人类感知复杂音高的机制 受试者对人类神经系统是独特的或特殊的，或者 这些都是哺乳动物共有的神经机制。在 神经生理学实验，颞叶的神经表征 和人类使用的相同波纹噪声的频谱特性 和龙猫的心理物理实验将被探索。大部分 生理学工作将涉及对大脑中单个神经元的研究。 灰鼠耳蜗核我们的目标是了解信息 关于和声性及其产生的时间规律性和音高， 在听觉系统中表现和处理。

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.