Figure 1

Experimental design. Practice sessions are scheduled at Day 1 and Day 4. Squares: blocks of practice session; grey squares: blocks of interest for the statistical analyses (performance is computed over 2 successive blocks). Day 1. B1: end of session 1 (blocks 12–13); B2: starting session 2 (blocks 14–15); B3: end of session 2 (blocks 17–18); Day 4. B4: end of session 3 (blocks 30–31); B5: starting session 4 (blocks 32–33); B6: end of session 4 (blocks 35–36).