56 lines
3.6 KiB
TeX
56 lines
3.6 KiB
TeX
\subsection{Grasp Task}
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\label{grasp}
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\paragraph{Completion Time}
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On the time to complete a trial, there were two statistically significant effects:
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\factor{Positioning} (\anova{4}{3990}{13.6}, \pinf{0.001}, see \figref{results/Grasp-CompletionTime-Location-Overall-Means})
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and \factor{Target} (\anova{3}{3990}{18.8}, \pinf{0.001}).
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\level{\level{Opposite}} was faster than \level{Fingertips} (\percent{+19}, \pinf{0.001}), \level{Proximal} (\percent{+13}, \pinf{0.001}), \level{Wrist} (\percent{+14}, \pinf{0.001}), and \level{Nowhere} (\percent{+8}, \p{0.03}).
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\level{Nowhere} was faster than \level{Fingertips} (\percent{+11}, \pinf{0.001}).
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\level{RF} was faster than \level{RB} (\pinf{0.001}), \level{LB} (\pinf{0.001}), and \level{LF} (\pinf{0.001});
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and \level{LF} was faster than \level{RB} (\p{0.03}).
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\paragraph{Contacts}
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On the number of contacts, there were two statistically significant effects:
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\factor{Positioning} (\anova{4}{3990}{15.1}, \pinf{0.001}, see \figref{results/Grasp-Contacts-Location-Overall-Means}) %
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and \factor{Target} (\anova{3}{3990}{7.6}, \pinf{0.001}).
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Fewer contacts were made with \level{Opposite} than with \level{Fingertips} (\percent{-26}, \pinf{0.001}), \level{Proximal} (\percent{-17}, \pinf{0.001}), or \level{Wrist} (\percent{-12}, \p{0.002});
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but more with \level{Fingertips} than with \level{Wrist} (\percent{+13}, \p{0.002}) or \level{Nowhere} (\percent{+17}, \pinf{0.001}).
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It was also easier on \level{LF} than on \level{RB} (\pinf{0.001}), \level{LB} (\p{0.006}), or \level{RF} (\p{0.03}).
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\paragraph{Time per Contact}
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On the mean time spent on each contact, there were two statistically significant effects:
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\factor{Positioning} (\anova{4}{3990}{2.9}, \p{0.02}, see \figref{results/Grasp-TimePerContact-Location-Overall-Means})
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and \factor{Target} (\anova{3}{3990}{62.6}, \pinf{0.001}).
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It was shorter with \level{Fingertips} than with \level{Opposite} (\percent{+7}, \p{0.01}).
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It was also shorter on \level{RF} than on \level{RB}, \level{LB} or \level{LF} (\pinf{0.001});
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but longer on \level{LF} than on \level{RB} or \level{LB} (\pinf{0.001}).
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\paragraph{Grip Aperture}
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On the average distance between the thumb's fingertip and the other fingertips during grasping, there were two
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statistically significant effects:
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\factor{Positioning} (\anova{4}{3990}{30.1}, \pinf{0.001}, see \figref{results/Grasp-GripAperture-Location-Overall-Means})
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and \factor{Target} (\anova{3}{3990}{19.9}, \pinf{0.001}).
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It was longer with \level{Fingertips} than with \level{Proximal} (\pinf{0.001}), \level{Wrist} (\pinf{0.001}), \level{Opposite} (\pinf{0.001}), or \level{Nowhere} (\pinf{0.001});
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and longer with \level{Proximal} than with \level{Wrist} (\pinf{0.001}) or \level{Nowhere} (\pinf{0.001}).
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But, it was shorter with \level{RB} than with \level{LB} or \level{LF} (\pinf{0.001});
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and shorter with \level{RF} than with \level{LB} or \level{LF} (\pinf{0.001}).
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\begin{subfigs}{grasp_results}{Results of the grasp task performance metrics for each vibrotactile positioning.}[
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Geometric means with bootstrap \percent{95} confidence and Tukey's \HSD pairwise comparisons: *** is \pinf{0.001}, ** is \pinf{0.01}, and * is \pinf{0.05}.
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][
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\item Time to complete a trial.
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\item Number of contacts with the cube.
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\item Time spent on each contact.
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\item Distance between thumb and the other fingertips when grasping.
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]
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\subfig[0.24]{results/Grasp-CompletionTime-Location-Overall-Means}
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\subfig[0.24]{results/Grasp-Contacts-Location-Overall-Means}
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\subfig[0.24]{results/Grasp-TimePerContact-Location-Overall-Means}
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\subfig[0.24]{results/Grasp-GripAperture-Location-Overall-Means}
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\end{subfigs}
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