How does Clinton Anderson teach a horse to lower its head on command and why is this important?

Teaching a horse to lower its head on command is a foundational exercise in Clinton Anderson's Downunder Horsemanship program because head lowering serves multiple practical purposes: it makes bridling easier, it signals and reinforces relaxation in the horse's nervous system, and it establishes a light, consistent response to poll pressure that will be used in many other contexts throughout the horse's training. Anderson teaches head lowering through steady, consistent pressure applied to the poll — the top of the horse's head just behind the ears. He applies the pressure with his hand or through a slight downward pull on the lead rope and holds that pressure steadily until the horse drops its head even one inch, then releases completely and immediately. The horse learns that the pressure releases when the head goes down, and that a down head is where the comfort is. The common mistake Anderson identifies is releasing the pressure when the horse throws its head up against it. A horse that tosses its head up against poll pressure and gets a release has learned that head tossing removes pressure — the opposite of the intended lesson. Anderson teaches maintaining the pressure through any head toss, releasing only on the downward try, even if the downward try is just the horse momentarily stopping its resistance. Over many repetitions, the response generalizes: the horse begins to drop its head at the approach of the handler's hand toward the poll, and eventually drops its head when the lead rope is simply picked up. This becomes the bridling cue — the horse that drops its head for the bridle is significantly easier and safer to bridle than one that raises and braces. Anderson also notes the physiological connection between head position and emotional state. A horse with a lowered head is physically in the opposite posture from a frightened, flight-ready horse, and he observes that deliberately asking a tense horse to lower its head often produces genuine calming — the body posture influences the emotional state as well as expressing it.