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. 2014 Apr 22;8:199. doi: 10.3389/fnhum.2014.00199

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Copyright © 2014 Lu, Mamun and Chau.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Normalized frequency of features (the number of times a feature has been selected divided by the total number of times all feature have been selected) across all participants.