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.

中文翻译：

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阅读和打字中的语言和运动处理：来自 Beta 频段功率调制的见解

在以情绪消极和中性词为特征的无声阅读和复制打字任务中，研究了 β 频带内 EEG 活动的功率调制，以阐明语言和运动处理之间的相互作用。在阅读中，在目标呈现后 200-600 毫秒出现单一的不同步，与否定词相比，中性词的较低 beta 频率的功率降低更强。打字任务揭示了两种不同的不同步。第一个出现在时空坐标中，与阅读任务中观察到的去同步非常相似，因此指向输入词刺激的语言处理水平的共同起源。此外，在键入响应期间出现了第二个与运动相关的不同步，刺激开始后 700 到 2000 毫秒。在这里，词语的情感内涵影响了较高的 Beta 波段。因此，任务之间的比较表明，不同的 beta 去同步反映了语言和运动处理的不同 EEG 标志。此外，情感内涵对打字任务与运动相关的不同步的影响表明，语言处理可以将其影响传播到运动反应执行阶段，这与从语言到运动处理的一系列信息流相反。