Figure 1
From: Preservation of explicit learning of visuomotor sequences during Parkinson’s disease progression

Procedure and outcome measures (a) Procedure for the 2 × 5 task. For correct responses, participants were asked to first press the button indicated by a “1” in each set, followed by the one marked “2”. (b) Procedure of the random task and 1 × 10 task. (c) Number of completed sets in the 2 × 5 task. The performance of a representative patient with stage IV PD. (d) The average of ERTs in the 2 × 5 task. These data were obtained by the same patient shown in (c). Grey triangles indicate the average ERT in each trial. Black dots indicate the average ERT in successful trials.