Adaptation is ongoing. An active human is forced to continually adapt in the face of a variety of changing circumstances. For example, we are repeatedly challenged by the need to solve significant problems of movement coordination. Movement coordination in this sense is considered to be the establishment of a functionally appropriate mapping between perceptual information available to the performer and the action capabilities of that performer (Shaw & Alley, 1985). The necessity to establish a new mapping can be prompted by many factors including changes in the performer due to growth, injury, or fatigue, changes in the environment, or the need to solve new task demands. Typically a task-relevant perception-action mapping can be established by the performer repeatedly attempting to solve the task.