Böcker K B, Bastiaansen M C, Vroomen J, Brunia C H, de Gelder B
Psychonomics Section, Tilburg University, The Netherlands.
Psychophysiology. 1999 Nov;36(6):706-20.
Rhythmic properties of spoken language such as metrical stress, that is, the alternation of strong and weak syllables, are important in speech recognition of stress-timed languages such as Dutch and English. Nineteen subjects listened passively to or discriminated actively between sequences of bisyllabic Dutch words, which started with either a weak or a strong syllable. Weak-initial words, which constitute 12% of the Dutch lexicon, evoked more negativity than strong-initial words in the interval between P2 and N400 components of the auditory event-related potential. This negativity was denoted as N325. The N325 was larger during stress discrimination than during passive listening. N325 was also larger when a weak-initial word followed a sequence of strong-initial words than when it followed words with the same stress pattern. The latter difference was larger for listeners who performed well on stress discrimination. It was concluded that the N325 is probably a manifestation of the extraction of metrical stress from the acoustic signal and its transformation into task requirements.
口语的节奏特性，如韵律重音，即强弱音节的交替，在荷兰语和英语等重音计时语言的语音识别中很重要。19名受试者被动聆听或主动区分双音节荷兰语单词序列，这些序列以弱音节或强音节开头。弱起始单词占荷兰语词汇的12%，在听觉事件相关电位的P2和N400成分之间的间隔中，比强起始单词引发更多的负波。这种负波被称为N325。在重音辨别过程中，N325比被动聆听时更大。当弱起始单词跟随强起始单词序列时，N325也比跟随具有相同重音模式的单词时更大。对于在重音辨别方面表现良好的听众，后一种差异更大。研究得出结论，N325可能是从声学信号中提取韵律重音并将其转化为任务要求的一种表现。
