We investigated the differential effects of levodopa medication and STN stimulation on finger force control in Parkinson subjects grasping to lift an object and performing vertical point-to-point movements of a hand-held object. The experiments were conducted in four treatment conditions: off-drug/off-stimulation, off-drug/on-stimulation, on-drug/off-stimulation and on-drug/on-stimulation. We found that the bradykinesia in Parkinsonian subjects improved by both levodopa medication and STN stimulation. As compared to healthy subjects, excessive grip force was observed in all Parkinson subjects, regardless of the treatment condition. This force excess was most pronounced in the on-drug condition and ameliorated by STN stimulation. We observed reliable correlations between the amount of force overflow and the severity of levodopa-induced dyskinesias in the on-drug condition. Despite some similarities regarding therapeutic effects on bradykinesia, our findings contrast with earlier observations with respect to the differential effects of levodopa and STN stimulation on the scaling of fingertip forces in Parkinson's disease. While levodopa causes an overshoot of fingertip forces, STN stimulation appears to be sufficient to alleviate, but not normalise the force excess. STN stimulation enables Parkinson subjects to scale grip force more accurately to the loads arising from voluntary manipulation of hand-held objects.
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