Fig. 3. Evolution of chunking patterns during motor skill acquisition in experiment 1.

(A) Chunking distance for patterns generated on the first and last days of training, as well as on the last follow-up session (i.e., day 60), for each group in experiment 1. (B) Average chunking distance for each group on each day, with its corresponding SE. The red dashed line in both panels indicates the boundary between the two classes that characterizes the chunking strategies of the young and older participants during the first training day, with any distance larger than zero being labeled old and any distance smaller than zero labeled young.