Abstract
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.
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Acknowledgements
This work was supported by a Direct Grant by the Faculty of Social Sciences at The Chinese University of Hong Kong (4052287) and by the National Natural Sciences Foundation of China (No. 31571140).
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UM, SR, and SL designed the study. SR, JZ, and PZ collected the data. RS conducted the focal electrode analyses. UM conducted the topographic analyses, created the figures, and wrote a first draft and the final version of the manuscript. BS prepared a second draft of the manuscript. All authors reviewed the manuscript.
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Maurer, U., Rometsch, S., Song, B. et al. Repetition Suppression for Familiar Visual Words Through Acceleration of Early Processing. Brain Topogr (2023). https://doi.org/10.1007/s10548-023-01014-2
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DOI: https://doi.org/10.1007/s10548-023-01014-2