The jerk cost was calculated by differentiating the position coordinates during motor performance three times with respect to time ( Schneider & Zernicke, 1989). The jerk theory involved a method for calculating the jerk cost at the early stage. The jerk-based quantitative method was first introduced for explaining the process and prediction of hand move-ment in space early on, and it was based on the principle that the maximum smoothness theory could be predicted by a bell-shaped velocity curve and straight line trajectory, which were the scales for assessing dynamic optimization by using kinematic end-point trajectory ( Flash & Hogan, 1985). Jerk Dimensionless jerk Smoothness Dance Dance experience Thus, our results support the idea that smoothness is an aspect of movement quantity distinct from speed and distance. This study suggests that dimensionless jerk should be used as a predictor for smoothness in dance movement. With regard to the smoothness of the left hand, there was no correlation between dance experience and any of the three jerk values.Ĭonclusion: Our results showed that individuals with more dance experience performed the task more smoothly. Results: With regard to the smoothness of the right hand, dance experience was significantly correlated with dimensionless jerk (r=0.656, p=0.028), while dance experience was not significantly correlated with integrated squared jerk (r=0.581, p=0.552) and mean squared jerk. The smoothness of hand movement was calculated using three jerk-based methods. Six infrared cameras were used to capture the movement of the hands of the dancers. Dancers performed the Taeguksun motion in Korea traditional dance. Methods: Eleven Korean traditional dancers whose experience of dancing ranged from 5 years to 20 years participated in this study. Objective: The aim of this study is to investigate the association between dance experience and smoothness of hand trajectory during dance by using three jerk-based quantitative methods (integrated squared jerk, mean squared jerk, and dimensionless jerk).
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