Hand velocity curve during the performance of an arm reaching trial. A - Start point, B - maximum velocity, C - end point of the center-out reaching movement. D - Start point, E - minimum velocity, F - end point of the out-center reaching movement. Horizontal dotted lines show how we determined start and end points of each portion (i.e., center-out and out-center) of the arm reaching movement. These lines were set at 5% of the maximum and minimum hand velocity, respectively.