Daneault et al. Journal of Medical Case Reports 2011, 5:449 http://www.jmedicalcasereports.com/content/5/1/449 Page 3 of 6 Figure 1 Example of tremors and power spectra. This graph illustrates a 20 second example of finger tremor and the resulting velocity power spectrum for both index fingers, during the second and fourth trial. Top row left: index finger tremor (20 seconds) of the right hand during the second trial. Top row right: index finger tremor (20 seconds) of the right hand during the fourth trial. Second row left: power spectrum on index finger tremor (20 seconds) of the right hand during the second trial. Note that the power spectrum was calculated on the velocity time series. Second row right: power spectrum on index finger tremor (20 seconds) of the right hand during the fourth trial. A shift of the power towards the lower frequencies in the fourth trial can be seen. Note that the power spectrum was calculated on the velocity time series. Third row left: index finger tremor (20 seconds) of the left hand during the second trial. Third row right: index finger tremor (20 seconds) of the left hand during the fourth trial. Bottom row left: power spectrum on index finger tremor (20 seconds) of the left hand during the second trial. Note that the power spectrum was calculated on the velocity time series. Bottom row right: power spectrum on index finger tremor (20 seconds) of the right hand during the fourth trial. We can observe that the spectral characteristics remain stable across the second and fourth trials. Note that the power spectrum was calculated on the velocity time series.