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@ -231,7 +231,8 @@ on muscle activity, we could not identify significant differences in terms of \%
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of \glsfirst{MVC} for any of our \gls{EMG} measurements. Only a slight trend,
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that \textit{Nyx (35 g)} produced the highest flexor \%\gls{MVC} for only 14\%
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of participants, could be interpreted as anecdotal evidence towards our
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hypothesis, that actuation force has an impact on muscle activity.
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hypothesis, that actuation force has an impact on muscle activity. Therefore we
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have to reject our hypothesis.
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\begin{phga_hyp*}[4 $\rightarrow$ \xmark]
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Differences in actuation force influence muscle activity while typing.
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@ -262,9 +263,49 @@ other keyboards. \textit{I3Z4XI7H} also reported in the post-experiment
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interview, that \textit{Hera} was surprisingly pleasant to use and that pain was
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significantly lower than with all other keyboards including
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\textit{Own}. However, because of the nearly identical scores to
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\textit{Aphrodite} we have to reject our hypothesis, that an adjusted keyboard
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is more satisfactory to use than standard keyboards.
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\textit{Aphrodite} in almost all categories, we have to reject our hypothesis,
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that an adjusted keyboard is more satisfactory to use than standard keyboards.
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\begin{phga_hyp*}[7 $\rightarrow$ \xmark]
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An adjusted keyboard is perceived as more satisfactory to type with compared to standard keyboards.
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An adjusted keyboard is perceived as more satisfactory to type with compared
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to standard keyboards.
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\end{phga_hyp*}
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Similarly, the resulting error rates measured for \textit{Hera (35 - 60 g)} were
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close to equal to the results of \textit{Aphrodite (50 g)} and for speed related
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metrics between those two keyboards only slight improvements while using
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\textit{Hera} in \gls{WPM} (0.8\%), \gls{AdjWPM} (0.6\%) and \gls{KSPS} (1\%)―
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that were not statistically significant―were recorded during our experiment. It
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was still interesting to see, that \textit{Hera} was the fastest, out of all
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four test keyboards, for eleven (45\%) out of the twenty-four subjects and that
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albeit the usage of 30\% keyswitches\footnote{That were actually pressed during
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our typing tests} that required 35 - 40 g actuation force, which is similar to
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the actuation force of \textit{Nyx (35 g)}, we did not see comparably high error
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rates. Because of the lacking evidence, that an adjusted keyboard produces less
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errors or supports the typist in achieving higher typing speeds, we have to
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reject our two hypotheses regarding those improvements.
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\begin{phga_hyp*}[5 $\rightarrow$ \xmark]
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An adjusted keyboard improves typing speed compared to standard keyboards
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(efficiency - speed).
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\end{phga_hyp*}
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\begin{phga_hyp*}[6 $\rightarrow$ \xmark]
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An adjusted keyboard is perceived as more satisfactory to type with compared
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to standard keyboards.
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\end{phga_hyp*}
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Our experiment basically revealed, that keyboards which utilized keyswitches
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with actuation forces that were neither to light (35 g) nor to heavy (80 g),
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generally outperformed keyboards which featured those extreme actuation
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forces. In the following section, we elaborate on possible limitations of our
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experimental design and future research that could be reasonable to further
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investigate advantages and disadvantages of adjusted keyboard designs.
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% ---
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