Fig. 5
Two-dimensional plot of relation (1) of tremor signal obtained while performing kinetic (cross) and resting (circle) tasks from a PD (a) and an ET (b) patient. Both are males with 77 years of ages and 7 years of disease duration. Delay units d 1 and d 2 in relation (1) were involuntarily selected to 5 and 20, respectively. The temporal fluctuation of tremor is the area of 95 % confidence ellipse covering the two-dimensional representation of kinetic (filled line) and resting (dash line) task