tokens: We assessed force coordination of the hand in Parkinson's disease and its relationship to motor complications of levodopa therapy , particularly to levodopa - induced dyskinesias ( LID ). We studied two groups of Parkinson's disease patients with ( Parkinson's disease + LID , n = 23 ) and without levodopa - induced dyskinesias ( Parkinson's disease - LID , n = 10 ), and age - matched healthy controls .