Korpilahti P, Krause C M, Holopainen I, Lang A H
Department of Phonetics, University of Helsinki, Helsinki, Finland.
Brain Lang. 2001 Mar;76(3):332-9. doi: 10.1006/brln.2000.2426.
In auditory perception the brain's attentional and preattentional mechanisms select certain stimuli for preferential processing and filter out irrelevant input. This study investigated nonattentive auditory processing in children. Event-related potentials (ERPs) provide a means to study neural correlates related to language and speech-sound processing. Mismatch negativity (MMN) is an ERP wave that indicates attention-independent perceptual change detection. In this study cortical ERPs were elicited by complex tones, naturally spoken words, and pseudowords, with each stimulus type containing equal acoustical elements. Tones elicited a bifurcated mismatch negativity (MMN), with early MMN (peaking at 150-200 ms) being more dominant. On the other hand, words elicited a strong late MMN, peaking at about 400-450 ms after stimulus onset. The MMN wave form was significantly weaker for pseudowords than for words. The late MMN wave, especially for word differences, was found to reflect summating MMN generators and memory trace formation on gestalt bases. Results suggest that the auditory processing, even nonattended, is highly associated with the cognitive meaning of the stimuli.
在听觉感知中，大脑的注意力和前注意机制会选择某些刺激进行优先处理，并过滤掉无关的输入信息。本研究调查了儿童的非注意听觉处理过程。事件相关电位（ERP）为研究与语言和语音处理相关的神经关联提供了一种手段。失配负波（MMN）是一种ERP波，它表明与注意力无关的感知变化检测。在本研究中，复杂音调、自然说出的单词和伪词诱发了皮层ERP，每种刺激类型都包含相等的声学元素。音调诱发了一种分叉的失配负波（MMN），早期MMN（在150 - 200毫秒达到峰值）更为显著。另一方面，单词诱发了强烈的晚期MMN，在刺激开始后约400 - 450毫秒达到峰值。伪词的MMN波形明显比单词的弱。发现晚期MMN波，特别是对于单词差异，反映了基于格式塔的MMN发生器总和和记忆痕迹形成。结果表明，即使在未被注意的情况下，听觉处理也与刺激的认知意义高度相关。
