Department of Psychology, The Chinese University of Hong Kong, Sino Building 3/F, Shatin, New Territories, Hong Kong SAR, China.
Centre for Developmental Psychology, The Chinese University of Hong Kong, Hong Kong, China.
Brain Topogr. 2024 Jul;37(4):608-620. doi: 10.1007/s10548-023-01014-2. Epub 2023 Nov 16.
The visual N1 (N170) component with occipito-temporal negativity and fronto-central positivity is sensitive to visual expertise for print. Slightly later, an N200 component with an increase after stimulus repetition was reported to be specific for Chinese, but found at centro-parietal electrodes against a mastoid reference. Given the unusual location, temporal proximity to the N1, and atypical repetition behavior, we aimed at clarifying the relation between the two components. We collected 128-channel EEG data from 18 native Chinese readers during a script decision experiment. Familiar Chinese one- and two-character words were presented among unfamiliar Korean control stimuli with half of the stimuli immediately repeated. Stimulus repetition led to a focal increase in the N1 onset and to a wide-spread decrease in the N1 offset, especially for familiar Chinese and also prominently near the mastoids. A TANOVA analysis corroborated robust repetition effects in the N1 offset across ERP maps with a modulation by script familiarity around 300 ms. Microstate analyses revealed a shorter N1 microstate duration after repetitions, especially for Chinese. The results demonstrate that the previously reported centro-parietal N200 effects after repetitions reflect changes during the N1 offset at occipito-temporal electrodes including the mastoids. Although larger for Chinese, repetition effects could also be found for two-character Korean words, suggesting that they are not specific for Chinese. While the decrease of the N1 offset after repetition is in agreement with a repetition suppression effect, the microstate findings suggest that at least part of the facilitation is due to accelerated processing after repetition.
视觉 N1（N170）成分具有枕颞负性和额中央正性，对印刷品的视觉专业知识敏感。稍晚些时候，据报道，一种 N200 成分在刺激重复后增加，对中文具有特异性，但在中顶电极相对于乳突参考时发现。鉴于其位置异常、与 N1 的时间接近以及非典型的重复行为，我们旨在澄清这两个成分之间的关系。我们在脚本决策实验中从 18 名母语为中文的读者收集了 128 通道 EEG 数据。在陌生的韩语控制刺激中呈现熟悉的中文单字和双字，其中一半刺激立即重复。刺激重复导致 N1 起始时焦点增加，N1 结束时广泛减少，尤其是对于熟悉的中文，并且在乳突附近也很明显。TANOVA 分析证实了在 ERP 图谱中 N1 结束时的重复效应具有强大的影响，该效应在脚本熟悉度周围 300ms 处进行调制。微状态分析显示重复后 N1 微状态持续时间缩短，尤其是中文。结果表明，先前报告的重复后中顶 N200 效应反映了包括乳突在内的枕颞电极处 N1 结束时的变化。尽管对于中文来说更大，但也可以在两个字符的韩语单词中找到重复效应，表明它们不是中文特有的。尽管重复后 N1 结束时的减少与重复抑制效应一致，但微状态发现表明，至少部分促进作用是由于重复后的加速处理所致。
