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. 2014 Dec 19;11:170. doi: 10.1186/1743-0003-11-170

Table 2.

Experimental tasks and analysis

Task Input Parameter measured Analysis method
Spiral tracing Line tracing f t , M t Tremor frequency and magnitude Power spectrum analysis
Task 1 Low frequency visual perturbation Tv Visual response delay Cross correlation of subject response with input
Tv* Predictive response delay
Task 2 Low-frequency torque perturbation Tp Proprioceptive response delay Cross correlation of subject response with input
Tp* Predictive proprioceptive response delay
Task 3 Fixed levels of isometric torque α Multiplicative motor noise Linear fit of variance vs. average torque
Task 4 High-frequency visual perturbation J, B, K Inertia, viscosity, stiffness of arm Bootstrapped model fit to the subject’s measured frequency response function (FRF)
J*, B*, K* Predictive inertia, viscosity, stiffness of arm
Kv, Kp, Kv*, Kp*, Kd, Kpr, Ki Sensory and Controller gains
Task 5 Visual offset RMSE Movement error Kinematic analysis

* indicates predictive values.