Boost-related motor improvements. Upper panel: Average reaction times for the two last blocks at the end of practice (Pre-Boost; B1 and B4), and the two first blocks (Boost; B2 and B5) and 4th and 5th blocks (Post-Boost; B3 and B6) after the 30-min interval, at Day 1 and Day 4. Tukey's Post Hoc: (***) P < .001, (**) P < .01. Errors bars are standard errors of the mean. Lower panel: Stimulus onset related potentials at Pre-Boost, Boost and Post-Boost sessions, averaging on Day1 and Day4 on electrode Oz.