Altered transposition asymmetry in serial ordering in early Parkinson's disease

IntroductionThe ability to arrange thoughts and actions in an appropriate serial order is impaired in Parkinson's disease (PD). However, it is unclear how serial order is represented and manipulated and how the representation or manipulation is altered in the early stages of PD. We aimed to analyze the pattern of performance errors in serial ordering versus serial recall in nondemented PD patients with mild clinical symptoms and healthy adults...