DEVELOPMENT OF FREQUENCY RESOLUTION IN INFANCY

婴儿期频率分辨率的发展

• 批准号: 3409208
• 负责人: Lynne A. Werner
• 金额: $ 9.55万
• 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 1987-11-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/3409208
• 关键词: auditory discrimination; human subject; infant human (0-1 year); longitudinal human study; psychoacoustics; psychophysiology; sensory mechanism; sound frequency

The ability of the auditory system to analyze a sound into its component frequencies, frequency analysis or resolution, underlies many types of complex auditory perception. The purpose of this project will be to examine the development of this ability in the first year of infancy. Although some earlier work has addressed the issue, it is not clear how sensory and nonsensory factors contribute to the performance of infants in the tasks used to measure frequency resolution. In the proposed work, three psychoacoustic measures of frequency resolution, varying in susceptibility to nonsensory performance factors, will be obtained from three groups of infants, tested longitudinally at 3, 6 and 12 months of age. In the first experiment, the effects of increasing signal level of the infant's ability to discriminate frequencies will be tested in order to determine how age-related changes in absolute sensitivity might influence discrimination. In the second experiment, psychophysical tuning curves, a measure of frequency resolution requiring detection rather than discrimination, will be generated. This measure will allow for assessment of task effects on measures of frequency analysis and will also provide additional information about frequency selective response when the masker frequency is at some distance from that of the signal. However, since psychophysical tuning curve widths may be affected by response bias effects, a third experiment is proposed, in which detection thresholds for a tone masked by comb-filtered noise will be obtained. This measure, although not as informative as the psychophysical tuning curve, will provide a check against possible response bias effects.

听觉系统将声音分析成其组成部分的能力 频率，频率分析或分辨率，是许多类型的 复杂的听觉感知。 该项目的目的是 在婴儿的第一年检查这种能力的发展。 虽然一些早期的工作已经解决了这个问题，但尚不清楚如何解决。 感官和非感官因素有助于婴儿的表现， 用于测量频率分辨率的任务。 在拟议的工作中， 频率分辨率的三种心理声学测量， 对非感官性能因素的敏感性，将从 三组婴儿，分别在3个月、6个月和12个月时进行纵向测试， 年龄 在第一个实验中，增加的信号水平的影响， 将测试婴儿辨别频率的能力， 确定年龄相关的绝对敏感性变化如何影响 歧视 在第二个实验中，心理物理调谐曲线， 一种频率分辨率的测量方法，需要检测而不是 歧视，就会产生。 这项措施将允许评估 的任务影响的措施，频率分析，也将提供 当掩蔽器 频率与信号的频率有一定距离。 但由于 心理物理调谐曲线宽度可能受反应偏差的影响 效果，提出了第三个实验，其中检测阈值为 将获得被梳状滤波噪声掩蔽的音调。 这项措施， 尽管不像心理物理调谐曲线那样信息丰富， 提供对可能的响应偏差效应的检查。