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. 2014 Aug 8;11:117. doi: 10.1186/1743-0003-11-117

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© Gerber et al.; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. 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 use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Forming 3-letter words. The user needs to spell as many 3-letter (dictionary) words as they can in 2 minutes. The letters can be overlaid on top of other letters. Left: the start state. Right: the user has spelled one word (POT) and is finishing the second (COT).