Comparison of accuracy between hand-squeeze detection and left vs. right detection of three-class hand squeeze classifier.

<p>The first bar for each participant is the accuracy for correct classification of a hand squeeze (left or right), given that a hand squeeze had occurred. The second bar for each participant is the accuracy for detection of a hand squeeze regardless of laterality. The bars show the mean accuracy across the resulting confusion matrices after five-fold cross validation for each participant. The error bars are the standard deviation over the five confusion matrices. The asterisks represent the confidence level to reject the null hypothesis that the classification accuracy once a hand squeeze is detected is significantly different from the accuracy of detecting if a hand squeeze has occurred using a two-tailed <i>t</i>-test (** for <i>p</i> < 0.01). White dashed lines indicate minor gridlines. For the exact <i>p</i>-values see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0131328#pone.0131328.s003" target="_blank">S2 Appendix</a>. For the full confusion matrices, see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0131328#pone.0131328.s002" target="_blank">S1 Appendix</a>.