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\section{Rating Scale Definitions}\label{definitions}

NASA has provided the following definitions of the six subscales used in the NASA-TLX workload assessment procedure. The volunteers are required to read and understand these terms before proceeding with the evaluation of the driving tasks in the experiments conducted. All definitions are quoted from Appendix A of the NASA-TLX Paper and Pencil Version Instruction Manual (Version 1.0) (NASA, 1986). 

\begin{enumerate}

\item {\textbf{\textit{Mental Demand}}: How much mental and perceptual activity was required (e.g. thinking, deciding, calculating, remembering, looking, searching etc.)? Was the task easy or demanding, simple or complex, exacting or forgiving?}
\item {\textbf{\textit{Physical Demand}}: How much physical activity was required (e.g. pushing, pulling, turning, controlling, activating etc.)? Was the task easy or demanding, slow or brisk, slack or strenuous, restful or laborious?}
\item {\textbf{\textit{Temporal Demand}}: How much time pressure did you feel due to the rate or pace at which the tasks or task elements occurred? Was the pace slow and leisurely or rapid and frantic?}
\item {\textbf{\textit{Performance}}: How successful do you think you were in accomplishing the goals of the task set up by the experimenter (or yourself)? How satisfied were you with your performance in accomplishing these goals?}
\item {\textbf{\textit{Effort}}: How hard did you have to work (mentally and physically) to accomplish your level of performance?}
\item {\textbf{\textit{Frustration}}: How insecure, discouraged, irritated, stressed and annoyed versus secure, gratified, content, relaxed and complacent did you feel during the task?}
\end{enumerate}

%\begin{figure}[h]
%\centering
%\includegraphics[angle = 272.7, width=0.69\textwidth]{def_slant}
%\caption[Rating Scale Definitions]{The definitions for the six subscales as provided by NASA. \textit{Rating Scale %Definitions taken from Appendix B of NASA-TLX Paper and Pencil Version Instruction Manual}}
%\label{fig:ratingDefinitions}
%\end{figure}
