III. RESULTS
Fig. 2 illustrated the average normalized subjective difficulty rating and the completion time of each trial. Ingeneral, most subjects found Trial 5 to be the most difficult task, and Trial 2 to be the easiest. Correlations of normalized perceived difficulty rating with the path length, number of angles in the path, and the time taken to finish each trial were 0.7714, 0.8007, and 0.6704 respectively (p < 0.001). Number of angles in the path corresponds to the number of sharp changes in path direction involved. No notable linear relationship could be observed between the normalized subjective difficulty rating and the average speed of individual subject in completing each trial. The accuracy in tracing was also found to be unrelated with the time and speed in current experiments.
III. RESULTSFig. 2 illustrated the average normalized subjective difficulty rating and the completion time of each trial. Ingeneral, most subjects found Trial 5 to be the most difficult task, and Trial 2 to be the easiest. Correlations of normalized perceived difficulty rating with the path length, number of angles in the path, and the time taken to finish each trial were 0.7714, 0.8007, and 0.6704 respectively (p < 0.001). Number of angles in the path corresponds to the number of sharp changes in path direction involved. No notable linear relationship could be observed between the normalized subjective difficulty rating and the average speed of individual subject in completing each trial. The accuracy in tracing was also found to be unrelated with the time and speed in current experiments.
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