Dipartimento di Psicologia e Scienze Cognitive, Università degli Studi di Trento, Corso Bettini 84, 38068 Rovereto, TN, Italy; Dipartimento di Psicologia dello Sviluppo e della Socializzazione, Università degli Studi di Padova, Via Venezia 8, 35131 Padova, PD, Italy.
Dipartimento di Psicologia dello Sviluppo e della Socializzazione, Università degli Studi di Padova, Via Venezia 8, 35131 Padova, PD, Italy.
Brain Lang. 2020 May;204:104758. doi: 10.1016/j.bandl.2020.104758. Epub 2020 Feb 5.
Power modulations of the EEG activity within the beta-frequency band were investigated across silent-reading and copy-typing tasks featuring emotionally negative and neutral words in order to clarify the interplay between language and motor processing. In reading, a single desynchronization surfaced 200-600 ms after target presentation, with a stronger power-decrease in lower beta frequencies for neutral compared to negative words. The typing task revealed two distinct desynchronizations. A first one surfaced within spatio-temporal coordinates closely resembling those of the desynchronization observed in the reading task, thus pointing towards a common origin at the level of linguistic processing of the input word stimuli. Additionally, a second motor-related desynchronization surfaced during the typed response, from 700 to 2000 ms after stimulus onset. Here, words' emotional connotation affected the higher beta band. The comparison between tasks thus suggests that different beta desynchronizations reflect distinct EEG landmarks for language and motor processing. Further, the effect of emotional connotation on the motor-related desynchronization of the typing task suggests that language processing can propagate its influence onto the stage of motor response execution, pointing against a serial flow of information from language onto motor processing.
本研究通过考察默读和打字任务中情绪性负性词和中性词的脑电活动，研究了β频带的脑电活动的功率调制，旨在阐明语言和运动加工之间的相互作用。在阅读中，目标呈现后 200-600ms 出现了单一的去同步化，与负性词相比，中性词的下 β 频带的功率下降更强。打字任务揭示了两个不同的去同步化。第一个去同步化出现在与阅读任务中观察到的去同步化非常相似的时空坐标中，因此表明输入词刺激的语言处理水平存在共同的起源。此外，第二个与运动相关的去同步化在刺激后 700 到 2000ms 之间出现。在这里，单词的情绪内涵影响了较高的β频带。因此，任务间的比较表明，不同的β去同步化反映了语言和运动加工的不同 EEG 标志。此外，打字任务中运动相关去同步化的情绪内涵效应表明，语言处理可以将其影响传递到运动反应执行阶段，这表明信息从语言到运动加工的传递不是串行的。
