Before we get lost in motor circuits, let us first review how we get the eyes to move where we want them to go. When thinking about a saccade there is a fast (pulse) and slow (step) component. The fast component is a result of a burst of activity in the PPRF that quickly shifts the eyes to the moving object. The slow phase, however, is generated by tonic neurons in the nucleus prepositus hypoglossi (PPH) that maintain a steady signal related to eye position, and thus holding them in place for a given amount of time. For example, say there is a moving object in the left visual field. This requires the left lateral rectus and right medial rectus to pull the eyes to the left very rapidly. One might ask how we can target these specific eye muscles?