Diagrammatic illustration of gait parameters. (a) The ventral view of the test mouse. Computer-digitized paw images used to represent stride length, paw angle, and paw area (left). One complete stride is the summation of the periods in which each paw spends in the phases of stance and swing (right). The stance phase is further divided into braking and propulsion phases. (b) Screen-captured image of periodic waveforms representing the advance and retreat of each of four limbs' motion relative to the treadmill belt. LF, left front; LR, left rear; RF, right front; RR, right rear.