DEVELOPMENT OF FREQUENCY RESOLUTION IN INFANCY

婴儿期频率分辨率的发展

• 批准号: 6329200
• 负责人: Lynne A. Werner
• 金额: $ 26.65万
• 依托单位: UNIVERSITY OF WASHINGTON
• 依托单位国家: 美国
• 财政年份: 1986
• 资助国家: 美国
• 起止时间: 1986-06-01 至 2002-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6329200
• 关键词: auditory discrimination; behavioral /social science research tag; clinical research; developmental neurobiology; hearing; human subject; infant human (0-1 year); loudness; psychoacoustics; sound frequency

The long-term objective of the proposed research is to describe and explain changes in auditory behavior that occur between infancy and adulthood in humans. The results of this research will help to define the course of normal auditory development. such information is a prerequisite to understanding abnormal development, as well as the function of the mature system. In addition, the methods developed in the course of this research may prove useful in assessing hearing loss in human infants. The research has five specific aims. The first is to examine the development of frequency resolution, the ability to respond selectively to one component of a complex sound. Previous work has shown that this ability is still immature at 3 months postnatal age. An experiment is proposed to examine frequency resolution in younger infants to follow its development. The second specific aim is to examine the development of temporal resolution, the ability to follow changes in a sound over time. Previous work has shown that infants respond poorly to temporal changes. The proposed work is aimed at determining whether the poor behavioral response is a result of immaturity of the primary auditory system. The third aim is to understand why infants have difficulty discriminating between frequencies under some conditions. Three experiments are proposed to examine frequency discrimination in 2- month-old infants and to determine whether infants' frequency discrimination varies with stimulus conditions as adults' frequency discrimination does. The fourth specific aim is to develop more reliable and sensitive measures of infant auditory behavior. The proposed experiments will attempt to model infant test methods to better understand how methods influence our measures of infant hearing, develop an improved "video reinforcer" for testing infants' hearing, and formalize a method for testing 2- to 4-week-old infants. the final specific aim is to ask how the ability to attend selectively to sound affects the infant's behavioral response. One experiment will determine how the infant's response to sound changes with intensity; differences between infants and adults in this measure are predicted if infants are inattentive to the sound. Two other experiments will address how the infant responds to an unexpected sound, and whether giving the infant additional cues about the timing and the acoustic frequency of a sound will improve detection.

拟议研究的长期目标是描述和 解释婴儿期和婴儿期之间听觉行为的变化， 人类的成年期 这项研究的结果将有助于确定 正常的听觉发展过程。 这些信息是 了解异常发育的先决条件，以及 成熟系统的功能。 此外， 这项研究可能有助于评估听力损失， 人类婴儿 研究有五个具体目标。 一是 检查频率分辨率的发展，响应能力 选择性地对复杂声音的一个组成部分。 以前的工作表明 这种能力在出生后3个月时还不成熟。 一个 本文提出一个实验来检验年幼婴儿的频率分辨率 来跟踪它的发展。 第二个具体目标是审查 时间分辨率的发展，能够跟踪 声音随着时间的推移。 以前的研究表明，婴儿对 时间变化。 拟议的工作旨在确定 不良的行为反应是由于不成熟的主要 听觉系统 第三个目的是了解为什么婴儿 在某些情况下很难区分频率。 本文提出了三个实验来检验2- 一个月大的婴儿，并确定是否婴儿的频率 辨别力随刺激条件的不同而变化， 歧视是。 第四个具体目标是开发更可靠的 和灵敏的婴儿听觉行为测量。 拟议 实验将尝试模拟婴儿测试方法，以更好地 了解方法如何影响我们对婴儿听力的测量， 一种改进的“视频听力测试仪”，用于测试婴儿的听力， 正式确定一种检测2至4周大婴儿的方法。 最终 具体的目的是问如何有选择地参加到声音的能力 会影响婴儿的行为反应 一个实验将决定 婴儿对声音的反应如何随强度而变化;差异 如果婴儿是一个成年人， 不注意声音。 另外两个实验将探讨 婴儿对意外的声音有反应， 关于声音的时间和声音频率的额外线索 将提高检测。