Asymmetrical Asynchronous Control

My parents have a pinball machine in their basement, and my Dad was impressed that my son Ian could  use the flippers independently-- apparently even some adults have trouble with this skill-- but Ian mastered this when he was three . . . and he seems to have some weird control over both sides of his body-- he kicks lefty and throws righty-- and he's always had the ability to raise one eyebrow, and in a far more natural manner than Mr. Spock.