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. 2015 Nov 19;370(1682):20140355. doi: 10.1098/rstb.2014.0355

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© 2015 The Author(s)

Published by the Royal Society. All rights reserved.

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Figure 3. — Mean values of the strike parameters for the two conditions (stone-flaking and nut-cracking) by level of expertise (untrained, trained and expert). Vertical bars denote 0.95 CIs. (a) Maximum velocity of the hammer during the strike; (b) kinetic energy of the hammer at contact; (c) maximum potential energy; (d) kinetic energy on potential energy ratio; (e) length of the hammer trajectory; (f) orientation of the striking surface for the flaking condition only (the striking surface being horizontal for the nut-cracking condition).