Aleksandrov A A, Memetova K S, Stankevich L N, Uplisova K O
Ross Fiziol Zh Im I M Sechenova. 2016 Jun;102(6):717-28.
The present study is designed to establish how lexical frequency of Russian words influences the acoustic mismatch negativity (MMN) latency and amplitude. The event related potentials (ERP) were recorded according to the multi-deviant passive odd-ball paradigm by using Russian words with different lexical frequencies and pseudowords. We found that the high-frequency words presentation led to a significantly more pronounced MMN response relative to the low-frequency one. The high-frequency words also evoked an earlier response, indicating more rapid access to a frequently used lexical entry. We suggest that a more pronounced amplitude and an earlier latency of acoustic MMN of high-frequency versus low-frequency items is a result of the word memory traces activation as more strongly connected assemblies of neurons. The MMN amplitude and latency for words were partly matched with the MMN for pseudowords (the analog of high-frequency word evoked the most pronounced response and the analog of low-frequency word evoked the weakest response), but the MMN amplitude and latency for pseudowords were significantly more pronounced and longer. We interpret this as evidence that processing of meaningless or unknown items is longer and their discrimination is more late and inaccurate than the discrimination of meaningful and frequently activated language elements.
本研究旨在确定俄语单词的词汇频率如何影响听觉失匹配负波（MMN）的潜伏期和波幅。采用多偏差被动odd-ball范式，使用具有不同词汇频率的俄语单词和伪词记录事件相关电位（ERP）。我们发现，与低频单词相比，高频单词的呈现导致MMN反应明显更显著。高频单词也引发了更早的反应，表明对常用词汇项的访问更快。我们认为，高频与低频项目的听觉MMN波幅更显著、潜伏期更早，是由于单词记忆痕迹作为连接更强的神经元集合被激活所致。单词的MMN波幅和潜伏期与伪词的MMN部分匹配（高频词类似物引发最显著的反应，低频词类似物引发最弱的反应），但伪词的MMN波幅和潜伏期明显更显著、更长。我们将此解释为证据，即无意义或未知项目的处理时间更长，与有意义且频繁激活的语言元素相比，它们的辨别更晚且不准确。
