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是 用于确定声源。这种复杂的刺激通常会产生 对音高的感知。该项目解决与以下问题有关的问题 对复杂声音的音高进行的时间处理，主要是涟漪 有噪音。波纹噪声会产生复杂的音调感知，就像 那些由许多其他复杂刺激产生的刺激。复音高为一 确定声源的可能线索。以前的人类心理物理 研究表明，对重复波纹噪声的处理最好是 由时间机制解释，例如可能通过 自相关。因此，该项目的一个主要焦点是时间 自相关等过程。这个项目使用了多学科的 基于人类心理物理学、动物心理物理学、动物的方法 神经生理学和建模以获得对颞叶的洞察 音高知觉的潜在机制。一系列人类心理社会 实验的目的是确定自相关性和它的 神经模拟，汇总相关图，可以解释音调和音调 复杂声音的强度，例如重复的涟漪噪声。在动物身上 心理物理实验，栗鼠的感知能力 用于处理与人类使用的相同类型的涟漪噪声刺激 将对心理社会实验进行评估。其中一个目标是确定 人类感知复杂音高的机制 受试者对人类神经系统来说是独一无二的还是特殊的，或者 这些都是普遍存在于哺乳动物身上的神经机制。在……里面 神经生理学实验中，颞叶的神经表征 和人类使用的相同波纹噪声的频谱特征 并将探索栗鼠的心理物理实验。大多数 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。目标是了解信息是如何 关于和谐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.