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. 2014 Oct 31;8:829. doi: 10.3389/fnhum.2014.00829

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Copyright © 2014 Eberhardt, Auer and Bernstein.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and 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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Histogram of numbers of participants sorted on whether they achieved criterion during training (left column) or not (right column). Row 1, VA; Row 2, VO; Row 3, VT. Normal curves are fitted to each distribution.