Laboratory of Neuro- and Psychophysiology, KU Leuven, Heresstraat 49, B-3000 Leuven, Belgium.
Department of Language Science and Technology, Saarland University, Saarbrücken, Germany.
Neuropsychologia. 2018 Jan 8;108:103-116. doi: 10.1016/j.neuropsychologia.2017.12.002. Epub 2017 Dec 2.
The effect of word association on sentence processing is still a matter of debate. Some studies observe no effect while others found a dependency on sentence congruity or an independent effect. In an attempt to separate the effects of sentence congruity and word association in the spatio-temporal domain, we jointly recorded scalp- and invasive-EEG (iEEG). The latter provides highly localized spatial (unlike scalp-EEG) and high temporal (unlike fMRI) resolutions. We recorded scalp- and iEEG in three patients with refractory epilepsy. The stimuli consisted of 280 sentences with crossed factors of sentence congruity and within sentence word-association. We mapped semantic retrieval processes involved in sentence comprehension onto the left temporal cortex and both hippocampi, and showed for the first time that certain localized regions participate in the processing of word-association in sentence context. Furthermore, simultaneous recording of scalp- and iEEG gave us a direct overview of signal change due to its propagation across the head tissues.
词联想对句子处理的影响仍存在争议。一些研究未观察到影响，而另一些研究则发现了对句子一致性的依赖或独立影响。为了在时空域中分离句子一致性和词联想的影响，我们联合记录了头皮和侵入性 EEG（iEEG）。后者提供了高度局部的空间分辨率（与头皮 EEG 不同）和高时间分辨率（与 fMRI 不同）。我们在三名患有难治性癫痫的患者中记录了头皮和 iEEG。刺激包括 280 个句子，句子一致性和句子内词联想的交叉因素。我们将参与句子理解的语义检索过程映射到左颞叶皮层和两个海马体上，并首次表明某些局部区域参与了句子语境中的词联想处理。此外，头皮和 iEEG 的同步记录使我们能够直接了解由于信号在头部组织中的传播而导致的信号变化。
