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. 2012 May 30;7(5):e38020. doi: 10.1371/journal.pone.0038020

Figure 1. Mean stimulation intensity (±SD) of the STN-DBS at 1, 2, 4, 6, 12 and 18 months after implantation in 20 patients with Parkinson's disease.

Figure 1

The stimulation intensity was calculated as the arithmetic product of the I-intensity, u-voltage, d-pulse duration and f-frequency from both hemispheres (uL.dL.fL+uR.dR.fR)/2. The stimulation intensity was gradually increasing during the study to optimize the motor outcome.