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. 2021 Apr 21;2(2):tgab030. doi: 10.1093/texcom/tgab030

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© The Author(s) 2020. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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(A) Grand average ERP waveforms for good (blue) and bad (maroon) exemplars in Experiment 1 are shown at 8 representative electrode sites distributed over the head. Plotted channel locations are marked as triangles on the schematic of the scalp (LMCe and RMCe are just posterior of and lateral to Cz on the 10–20 system). Negative voltage is plotted upwards. The waveforms differ over frontal sites beginning in the N300 time-window (250–350 ms), with greater negativity for bad exemplars as compared with good exemplars. The bar plot gives mean amplitude over the 11 frontal electrode sites (darkened electrode sites on the schematic of the scalp) used for the primary statistical analyses. The error bars plotted are within-subject confidence intervals. N = 20. (B) Topographic plots of the difference waves for the main effect of representativeness (Bad–Good). In the N300 time-window we see a frontal distribution, whereas in the N400 time-window we see a centro-parietal distribution, with a slightly left laterality.