DEVELOPMENT OF TEMPORAL RESOLUTION IN CHILDREN AS MEASURED BY THE TEMPORAL-MODULATION TRANSFER-FUNCTION
DEVELOPMENT OF TEMPORAL RESOLUTION IN CHILDREN AS MEASURED BY THE TEMPORAL-MODULATION TRANSFER-FUNCTION
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DOI：
10.1121/1.410474
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发表时间：
1994-07-01
影响因子：
2.4
通讯作者：
GROSE, JH
中科院分区：
文献类型：
--
作者：
HALL, JW;GROSE, JH
本研究测量了4岁至成年听者的时间调制传递函数（TMTFs），以表征儿童时间分辨能力的发展。测试对象为4-5岁、6-7岁、9-10岁和成人4个年龄组。对于调制频率为5,20,100,150和200hz的噪声载波（200- 1200hz的带通噪声）的正弦调制的灵敏度进行了测定。来自所有听众的数据表明，随着调制频率的增加，对调制的敏感性降低。时间常数由拟合数据的函数的3db下降点导出。所得时间常数未见年龄效应。然而，与成人相比，4-5岁和6-7岁的儿童对调节的敏感性降低，与9-10岁的儿童相比，4-5岁的儿童对调节的敏感性降低。所有年龄组的时间常数一致，表明4岁及以上儿童的颞包膜外周编码可能与成人相似；然而，幼儿在处理调制检测的信息方面表现得相对低效。
Temporal modulation transfer functions (TMTFs) were measured in listeners aged 4 years to adult in order to characterize the development of temporal resolution in children. Four age groups were tested, 4-5 years of age, 6-7 years of age, 9-10 years of age, and adult. Sensitivity to sinusoidal modulation of a noise carrier (a bandpass noise from 200-1200 Hz) was determined for modulation frequencies of 5, 20, 100, 150, and 200 Hz. The data from all listeners indicated decreasing sensitivity to modulation as a function of increasing frequency of modulation. Time constants were derived from the 3-dB down points of functions that were fitted to the data. No age effects were observed for the derived time constants. However, sensitivity to modulation was found to be reduced in the children 4-5 and 6-7 years of age, as compared to adults, and in the children 4-5 years of age as compared to children 9-10 years of age. The agreement of time constant across all age groups was interpreted as indicating that the peripheral encoding of the temporal envelope is probably adultlike in children aged 4 years and above; however, young children appear to be relatively inefficient in processing the information underlying modulation detection.