Fig. 1
(A) Time series change in the group mean value of the ball angular velocity ωball, and a boxplot of the maximum ball angular velocity ωball_max. (B) Time series change in the group mean angular velocity of the vector from the ball center to the fingertip ωfc, and a boxplot of the maximum angular velocity of the vector from the ball center to the fingertip ωfc_max. (C) Time series change in the group mean difference between the ball angular velocity and angular velocity of the vector from the ball center to the fingertip Δωfb, and a boxplot for the maximum difference in angular velocities Δωfb_max for each finger–ball friction condition. In time series graphs, the solid line indicates the between-participant mean, and the shaded area indicates the between-participant mean ± standard deviation. t = 0 ms indicates the release time of the ball. In boxplots, circles with white spaces are the mean values within participants, and the black circle is the group mean value. * and ** indicate p < 0.05 and p < 0.01, respectively.
