Fig. 8

Correlations between the pool-averaged coherence levels at double tremor frequency and the tremor amplitudes in shoulder and elbow joints. Exponential regression results show that the tremor amplitudes in DOFs of a elbow flexion, b shoulder flexion, c shoulder abduction, and d shoulder rotation are not significantly correlated with the pool-averaged coherence level at double tremor frequency. Different subjects are indicated with different markers and the error bars indicate the standard deviation of tremor amplitudes of each subject