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. 2020 Oct 13;10:17064. doi: 10.1038/s41598-020-74143-4

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Results of the on-line spelling tasks. For each participant, the classification accuracy, average selection time, information transfer rate (ITR), and output characters per minute (OCM) after letter-by-letter spelling with the 4-target speller, letter-by-letter spelling with the 32-target speller and dictionary-assisted spelling with the 32-target speller are presented. The letter-by-letter spelling task was the same for both systems (the pangram “THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG”). The dictionary-assisted spelling task was an English sentence (for each participant, an individual sentence ranging from 24 to 51 characters). The dashed lines indicate the means across participants.