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To study procedural learning changes in patients with non-demented Parkinson disease (PD) but without depression. The Nissen serial reaction time task (SRTT) software version II (as a task of procedural learning), the Wechsler Memory Scale-Chinese version (WMS-CR), and two tasks of implicit memory were applied to 20 PD patients with a Hoehn–Yahr score at I–II degrees and 20 matched healthy controls...
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