ERPs differentiate syllable and nonphonetic sound processing in children and adults
ERPs differentiate syllable and nonphonetic sound processing in children and adults
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DOI：
10.1111/j.1469-8986.2005.00305.x
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发表时间：
2005-07-01
期刊：
影响因子：
3.7
通讯作者：
Townsend, J
中科院分区：
文献类型：
--
作者：
Ceponiene, R;Alku, P;Townsend, J
我们研究了听觉事件相关脑电位（ERPs）中语音相关指标的成熟。儿童和成人的erp是由音节和非语音相关诱发的。与音节刺激相比，非语音刺激在成人中诱发的N1和P2更大，在儿童中诱发的P1更大。由于非语音在感知上更加显著，这种N1效应与已知的N1对声音开始特征的敏感性是一致的。基于刺激依赖性和独立成分结构，儿童P1似乎包含重叠的p2样活动。在两个被试组中，音节激发出更大的N2/N4峰。这可能反映了声音内容特征处理，语音比非语音更广泛。因此，声音检测机制（N1, P2）仍在发育，而声音内容处理机制（N2, N4）在儿童中期基本成熟；在儿童和成人中，语音比非语音在刺激后200-400毫秒被更广泛地处理。
We examined maturation of speech-sound-related indices of auditory event-related brain potentials (ERPs). ERPs were elicited by syllables and nonphonetic correlates in children and adults. Compared with syllables, nonphonetic stimuli elicited larger N1 and P2 in adults and P1 in children. Because the nonphonetics were more perceptually salient, this N1 effect was consistent with known N1 sensitivity to sound onset features. Based on stimulus dependence and independent component structure, children's P1 appeared to contain overlapping P2-like activity. In both subject groups, syllables elicited larger N2/N4 peaks. This might reflect sound content feature processing, more extensive for speech than nonspeech sounds. Therefore, sound detection mechanisms (N1, P2) still develop whereas sound content processing (N2, N4) is largely mature during mid-childhood; in children and adults, speech sounds are processed more extensively than nonspeech sounds 200-400 ms poststimulus.