Fig. 4
From: Does changing Fitts’ index of difficulty evoke transitions in movement dynamics?
PCA: 1st eigenvalue. a Trajectory variability decreased with increasing ID e for the discrete task mode whereas it increased in the cyclic mode (from the 3rd ID e onwards). b Similarly, trajectory variability in the distance conditions decreased with increasing ID e whereas that in the width conditions increased. c, d This effect, however, was most pronounced for the cyclic task. In the discrete task trajectory variability in the width condition stayed about the same for all ID e