We used four blocks for the task. Table I shows the combi-nation of D and W, as well as ID; during the tests, they appear randomly.
These values are the same as the ones for the one-directional task of [23], but four combinations of D–W that have clear distinct ID values were chosen.
The procedure for the multidirectional circular tapping task is to point and to select the circle indicated in red; after that, a circle diagonally opposite will be indicated until all the 15 circles for each block have been gone through, Fig. 3(c). Here, the data registration considers 14 steps in 15 circles.
Table II shows the combination of D and W, as well the ID; during the tests, they appeared randomly.
These values are the same as the ones for the multidirectional task of [23], which used just three D–W combinations. Combi-nation D = 305 W = 76 (ID = 2.33) was not used there. Here, we include a one-directional vertical task to verify if a different muscular response in the control of LCS by the lower lip is observed.
The participants were asked to balance cursor movement as fast and precisely as possible for all tasks.