Oceák Attila, Winkler István, Sussman Elyse, Alho Kimmo
Institute for Psychology, Hungarian Academy of Sciences, Budapest, Hungary.
Psychophysiology. 2006 Jan;43(1):13-20. doi: 10.1111/j.1469-8986.2006.00372.x.
Abstract Infrequently omitting a sound from a repetitive sequence elicits the mismatch negativity (MMN) ERP response when the stimulus onset asynchrony (SOA) is less than 200 ms. We contrasted two alternative explanations of omission MMN. (1) Each sound starts a separate temporal integration process. Omissions violate the constancy of the temporal structure within the integration window. (2) Sounds preceding an omission are perceived to be louder than those followed by a sound within the integration period, because omissions allow the full stimulus aftereffect to be included in perceived loudness. We varied the SOA between 117 and 217 ms. For this case, the temporal structure explanation predicts that no MMN will be elicited, whereas the loudness summation explanation predicts that MMN will be elicited. MMN was elicited by tone omissions with random SOA, suggesting that loudness summation plays an important role in the elicitation of omission MMN.
当刺激起始异步（SOA）小于200毫秒时，从重复序列中偶尔遗漏一个声音会引发失匹配负波（MMN）ERP反应。我们对比了对遗漏MMN的两种不同解释。（1）每个声音启动一个独立的时间整合过程。遗漏破坏了整合窗口内时间结构的恒定性。（2）在整合期内，遗漏之前的声音被感知为比之后有声音的那些声音更响亮，因为遗漏使得完整的刺激后效应被纳入到感知响度中。我们将SOA在117至217毫秒之间进行变化。对于这种情况，时间结构解释预测不会引发MMN，而响度总和解释预测会引发MMN。随机SOA的音调遗漏引发了MMN，这表明响度总和在遗漏MMN的引发中起重要作用。
