Separable developmental trajectories for the abilities to detect auditory amplitude and frequency modulation.
Separable developmental trajectories for the abilities to detect auditory amplitude and frequency modulation.
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DOI：
10.1016/j.heares.2011.05.019
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发表时间：
2011-10
期刊：
影响因子：
2.8
通讯作者：
Wright, Beverly A.
中科院分区：
文献类型：
--
作者：
Banai, Karen;Sabin, Andrew T.;Wright, Beverly A.
调幅（AM）和调频（FM）是大多数自然声音的固有成分。检测这些调制的能力，被认为是正常听觉和言语感知的关键，在发育过程中得到改善。然而，AM和FM检测技能的发展在多大程度上遵循不同的轨迹，因此可以归因于不同过程的成熟，仍然不清楚。在这里，我们探讨了发展轨迹之间的关系，检测正弦AM和FM的横截面设计雇用8-10岁和11-12岁的儿童和成人。对于音调载波的FM，平均性能（平均值）和性能一致性（收听者内标准差）在8-10岁时与成人相似。相比之下，在相同的听众中，宽带噪声载波的AM的平均性能在11-12岁时仍然不像成人，尽管性能一致性在8-10岁时已经成熟。在儿童中，AM和FM检测的成熟度之间没有显着的相关性。两种调制线索之间的发展轨迹和平均检测阈值和性能的一致性之间的这些差异表明，至少部分不同的过程可能是发展的基础AM和FM检测以及检测调制的能力，并始终这样做。
Amplitude modulation (AM) and frequency modulation (FM) are inherent components of most natural sounds. The ability to detect these modulations, considered critical for normal auditory and speech perception, improves over the course of development. However, the extent to which the development of AM and FM detection skills follow different trajectories, and therefore can be attributed to the maturation of separate processes, remains unclear. Here we explored the relationship between the developmental trajectories for the detection of sinusoidal AM and FM in a cross-sectional design employing children aged 8–10 and 11–12 years and adults. For FM of tonal carriers, both average performance (mean) and performance consistency (within-listener standard deviation) were adult-like in the 8–10 y/o. In contrast, in the same listeners, average performance for AM of wideband noise carriers was still not adult-like in the 11–12 y/o, though performance consistency was already mature in the 8–10 y/o. Among the children there were no significant correlations for either measure between the degrees of maturity for AM and FM detection. These differences in developmental trajectory between the two modulation cues and between average detection thresholds and performance consistency suggest that at least partially distinct processes may underlie the development of AM and FM detection as well as the abilities to detect modulation and to do so consistently.
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