Centre for Languages and Literature, Lund University, Lund, Sweden.
Neuroreport. 2024 Sep 4;35(13):868-872. doi: 10.1097/WNR.0000000000002077. Epub 2024 Jul 8.
This study investigated whether the brain utilizes morphologically induced tones for semantic processing during online speech perception. An auditory comprehension task was conducted while measuring event-related potentials (ERPs). The study tested whether a discrepancy between contextual expectations and the tonal realizations of the target word would yield an N400 effect, indicative of semantic processing difficulty. An N400 effect was observed, reflecting integration difficulty due to semantic anomalies caused by incongruent tones. Additionally, the ERPs in the congruent conditions were modulated by the cohort entropy of the target word indicating lexical competition. The late negativity observed in this study encompasses both the N400 and preactivation negativity. This overlap underscores the brain's potential for rapidly connecting form and meaning from different sources within the word, relying on statistically based prediction in semantic processing.
本研究旨在探究在在线言语感知过程中，大脑是否利用形态诱导音来进行语义处理。在进行听觉理解任务的同时，测量了事件相关电位（ERP）。研究测试了目标词的语境期望与音高实现之间的差异是否会产生 N400 效应，这表明了语义处理的难度。观察到 N400 效应，反映了由于不和谐的音高导致语义异常而引起的整合困难。此外，在一致条件下的 ERP 受到目标词的群体熵调制，表明词汇竞争。本研究中观察到的晚负波（late negativity）同时包含了 N400 和前激活负波。这种重叠强调了大脑在语义处理中从单词的不同来源快速连接形式和意义的潜力，依赖于基于统计的预测。
