Figure 4

Depicts subject S2 making a single right turn during the Car Race simulation, on three separate occasions over the training period. Green bold line depicts roll angle. Blue thin line is horizontal (pushing) force. S2's ability to coordinate the sagittal plane pushing needed to accelerate the car with the supination required to turn the car progresses from multiple unsuccessful attempts on day one (top panel), to a slow and disjointed sweeping turn on day five(middle panel), to a single sharp turn without a loss in speed on day 9 (bottom panel).