Veliks Viktors, Kolesovs Aleksandrs, Porozovs Juris, Igonins Dmitrijs
University of Latvia, Riga, Latvia.
Front Hum Neurosci. 2025 Apr 22;19:1542289. doi: 10.3389/fnhum.2025.1542289. eCollection 2025.
The present study explored the effects of word list length during the encoding of visual verbal stimuli. The participants received Latvian nouns in lists of different lengths: short (up to 29), medium (30-59), and long (60-160). During the presentation of visual stimuli, the 19-channel EEG was recorded with a sample rate of 512 Hz and cut-off frequencies of 0.1-50 Hz. The memory encoding process was analyzed with the event-related potential (ERP) and time-frequency (TF) methods for selected regions of interest (ROI) electrodes F3, F7, C3, P3, T3, and T5 in the 10-20 system corresponding to language processing brain areas. We compared ERP and TF data regarding the list length in the -100 ms to 700 ms time window. ROI electrodes T3, T5, and P3 indicated significantly different involvement of language processing areas under different list lengths by ERP observation. More lateralized regions (F7, T3) provided evidence for more pronounced differences in the encoding process than less lateralized regions (F3, C3). The analysis of TF revealed differences in theta, alpha, and beta wave bands in the F3 and P3 channels. Medium lists demonstrated higher differences from short and long lists, indicating a nonlinear trend in the involvement of language-processing regions.
本研究探讨了视觉言语刺激编码过程中单词列表长度的影响。参与者接收不同长度列表中的拉脱维亚名词：短列表（最多29个）、中列表（30 - 59个）和长列表（60 - 160个）。在视觉刺激呈现期间，以512 Hz的采样率和0.1 - 50 Hz的截止频率记录19通道脑电图。使用事件相关电位（ERP）和时频（TF）方法，对10 - 20系统中与语言处理脑区相对应的选定感兴趣区域（ROI）电极F3、F7、C3、P3、T3和T5的记忆编码过程进行分析。我们比较了 - 100 ms至700 ms时间窗口内关于列表长度的ERP和TF数据。通过ERP观察，ROI电极T3、T5和P3表明在不同列表长度下语言处理区域的参与存在显著差异。与较少偏侧化的区域（F3、C3）相比，更多偏侧化的区域（F7、T3）为编码过程中更明显的差异提供了证据。TF分析揭示了F3和P3通道中θ、α和β波段的差异。中列表与短列表和长列表相比显示出更高的差异，表明语言处理区域参与存在非线性趋势。
