With the baby in the supine position, turn the head to one side, holding the jaw over the shoulder. The arm and leg on the side to which the head is turned extend, while the opposite arm and leg flex. This response does not normally occur each time this maneuver is performed, and when it is elicted each time it is evoked it should be considered abnormal, at any age. It will persist beyond the time of expected disappearance in major cerebral damage.